SILICON LABS Si47XX Evaluation Board

Product Usage Instructions

Specifications

The Si47xx Evaluation Board (EVB) is designed to support various functions within the Si47xx family of products, including FM Transmitter, FM Receiver, AM Receiver, SW/LW Receiver, WB Receiver, RDS, High Performance RDS, RPS, SAME, Digital Input, Digital Output, Embedded FM antenna. The board comes in different sizes ranging from 2.5×2.5mm to 4x4mm and is AEC-Q100 Qualified.

1. Getting Started Before starting, ensure that you have the necessary cables and power supply to connect the Si47xx EVB to your system.

2. Connection Connect the Si47xx EVB to your system using the appropriate cables and connectors. Refer to the user manual for detailed connection instructions.

3. Power On Power on the Si47xx EVB and make sure all the necessary LEDs and indicators light up as expected.

4. Software Setup Install the associated software for the Si47xx EVB on your system. Follow the software setup guide provided to configure the board for your specific use case.

5. Testing Once everything is set up, test the different functions of the Si47xx EVB to ensure they are working correctly. Refer to the user manual for testing procedures.

FAQs

Q: Where can I find support articles and application notes for the Si47xx EVB? A: Support articles, answers to frequently asked questions, and application notes can be found at www.mysilabs.com.

Q: What are the available products in the Si47xx family? A: The Si47xx family includes a range of products such as FM Transmitters, FM Receivers, AM Receivers, SW/LW Receivers, WB Receivers, RDS, High Performance RDS, RPS, SAME, Digital Input, Digital Output, and more. Refer to Table 1 in the user manual for a detailed list of products.

Q: How do I know which sections of the user manual apply to my specific Si47xx EVB? A: Table 2 in the user manual serves as a quick reference guide for the sections of interest for your EVB. Sections 1, 4, 9, and 10 of the document apply to all EVBs.

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Si47xx-EVB
Si47XX EVALUATION BOARD USER’S GUIDE

Introduction

Thank you for purchasing the Silicon Laboratories, Inc. Si47xx Evaluation Board (EVB). The EVB and associated software have been designed to speed up the overall development process. We look forward to working with you, and have posted support articles, answers to frequently asked questions, and application notes at www.mysilabs.com. Table 1 describes all of the available products and features in the Si47xx family.
Table 1. Product Family Function

FM Transmitter FM Receiver AM Receiver
SW/LW Receiver WB Receiver RDS
High Performance RDS RPS SAME
Digital Input Digital Output Embedded FM antenna AEC-Q100 Qualified Package Size (mm)

Part Number

General Description

Si4700 FM Receiver

Si4701 FM Receiver with RDS

Si4702 FM Receiver

Si4703 FM Receiver with RDS

Si4704 FM Receiver

Si4705 FM Receiver with RDS

Si47061 High Performance RDS Receiver

Si47071 WB Receiver with SAME

2

Si4708 FM Receiver

Si4709 FM Receiver with RDS

Si4710 FM Transmitter

Si4711 FM Transmitter with RDS

Si4712 FM Transmitter with RPS

Si4713 FM Transmitter with RDS & RPS

Si4720 FM Transceiver

Si4721 FM Transceiver with RDS

Si4730 AM/FM Receiver

Si4731 AM/FM Receiver with RDS

2

Notes: 1. Si4706, Si4707, and Si474x are covered under NDA. 2. High Performance RDS is available in Si4705/31/35/85-D50 and later.

4×4 4×4 3×3 3×3 3×3 3×3 3×3 3×3 2.5×2.5 2.5×2.5 3×3 3×3 3×3 3×3 3×3 3×3 3×3 3×3

Rev. 0.8 2/12

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Si47xx-EVB
Table 1. Product Family Function (Continued)

FM Transmitter FM Receiver AM Receiver
SW/LW Receiver WB Receiver RDS
High Performance RDS RPS SAME
Digital Input Digital Output Embedded FM antenna AEC-Q100 Qualified Package Size (mm)

Part Number

General Description

Si4734 AM/SW/LW/FM Receiver

Si4735 AM/SW/LW/FM Receiver with RDS

2

Si4736 AM/FM/WB Receiver

Si4737 AM/FM/WB Receiver with RDS

Si4738 FM/WB Receiver

Si4739 Si47401 Si47411 Si47421
Si47431
Si47441 Si47451 Si47491

FM/WB Receiver with RDS AM/FM Receiver AM/FM Receiver with RDS AM/LW/SW/FM/WB Receiver AM/LW/SW/FM/WB Receiver with RDS AM/LW/SW/FM Receiver AM/LW/SW/FM Receiver with RDS High-Performance RDS Receiver

Si4784 FM Receiver

Si4785 FM Receiver with RDS

2

Notes: 1. Si4706, Si4707, and Si474x are covered under NDA. 2. High Performance RDS is available in Si4705/31/35/85-D50 and later.

3×3

3×3

3×3

3×3

3×3

3×3

4×4

4×4

4×4

4×4

4×4

4×4

4×4

3×3

3×3

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Si47xx-EVB

This user’s guide contains information related to only the Si47xx EVBs itemized in Table 2. Table 2 serves as a quick reference guide for the sections of interest for your EVB. Sections 1, 4, 9, and 10 of the document apply to all EVBs.

Table 2. Quick Reference Guide

Part

Description Recommended

GUI

Bill of Materials Schematics Layout

HW Setup

Si4704/05/ Sections 2.1., 06/84/85 2.2.1., and
2.2.6.
Si4707 Section 2.2.2., 2.2.5., 2.2.6.
Si4710/11/ Sections 2.1., 12/13 2.2.1., 2.2.6.
Si4720/21 Sections 2.1., 2.2.1., 2.2.6.
Si4730/31 Sections 2.1., 2.2.2., 2.2.5., 2.2.6

Section 3.2.
Section 3.2.
Section 3.1.
Sections 3.1. and 3.2. Sections 3.2. and 3.3.

Si4734/35 Sections 2.1., 2.2.2., 2.2.5., 2.2.6.

Sections 3.2. and 3.3.

Section 6. Section 11. Tables Sections 12.1., Sections

29 and 30

12.2.

13.1., 13.2.

Section 7.
Section 5.
Sections 5. and 6. Sections 6. and 8.
Sections 6. and 8.

Section 11.,

Section 12.1., Section

Tables 29 and 31 12.3.

13.1., 13.3.

Section 11. Tables Sections 12.1., Sections

29 and 30

12.2.

13.1., 13.2.

Section 11. Tables Sections 12.1., Sections

29 and 30

12.2.

13.1., 13.2.

Section 11. Tables Sections 12.1., Sections

29, 31, 34, 35, and 12.3., 12.6.1., 13.1., 13.3.,

36

12.6.2.

13.6.1.,

13.6.2.

Section 11. Tables Sections 12.1., Sections

29 and 37

12.3., 12.6.3. 13.1., 13.3.,

13.6.3.

Si4736/37 Sections 2.1., 2.2.2., 2.2.5., 2.2.6.

Sections 3.2. and 3.3.

Sections 6., Section 11. Tables Sections 12.1., Sections

7., and 8. 29 and 37

12.3., 12.6.3. 13.1., 13.3.,

13.6.3.

Si4738/39 Sections 2.1., 2.2.2., 2.2.5., 2.2.6.

Sections 3.2. and 3.3.

Sections 6., Section 11. Tables Sections 12.1., Sections

and 7.

29 and 37

12.3., 12.6.3. 13.1., 13.3.,

13.6.3.,

Si4740/41/ Section 2.1., 42/43/44/45 2.2.3., 2.2.5.,
2.2.6.
Si4749 Sections 2.1., 2.2.4. , 2.2.6.

Sections 3.2. and 3.3.
Section 3.2.

Sections 7. and 8.
Section 6.

Section 11., Table Sections 12.1., Sections

29, 32, 37

12.4., 12.6.4. 13.1.,

13.4.,13.6.4.

Section 11. Tables Sections 12.1., Section

29 and 33

12.5.

13.1., 13.5.

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Si47xx-EVB

There are ten different EVB kits within the Si47xx family. Each kit ships with a standard set of components that are common to all kits and a unique set that depends on the EVB kit P/N. Standard set of components are:
Customer welcome and evaluation letter EVB Characterization Report USB cable RCA cable 9 V battery Headphones Si47xx CD including:
Data sheet Development application GUI rev 2.5.4 or later User’s guide Quick start guide. The unique set of components for each EVB kit is defined in Table 3.
Table 3. Si47xx-EVB Kit Unique Contents

Adapters

EVB Kit

Base Daughtercard Board

Antenna Cards

Antennas BNC Male to RCA Female

SMA Male to
BNC Female

SMA Female to BNC Male

SMA Male to
SMA Male

Si4705-EVB Si47xx

Si471x/2x

—

Base board Daughtercard

Rev1.3 or Rev1.2 or later

later

—

Yes

No

No

No

Si4706-EVB Si47xx

Si471x/2x

—

Base board Daughtercard

Rev1.3 or Rev1.2 or later

later

—

Yes

No

No

No

Si4707-EVB Si47xx

Si473x

SAME

Whip

Yes

No

Base board Daughtercard antenna

antenna

Rev1.3 or Rev1.2 or later

later

No

No

Si4713-EVB Si47xx

Si471x/2x

—

Base board Daughtercard

Rev1.3 or Rev1.2 or later

later

—

Yes

No

No

No

Si4721-EVB Si47xx

Si471x/2x

—

Base board Daughtercard

Rev1.3 or Rev1.2 or later

later

—

Yes

No

No

No

Si4731-EVB Si47xx

Si473x 4731 antenna Loop

Yes

No

Base board Daughtercard kit (large fer- antenna

Rev1.3 or Rev1.2 or later rite, medium

later

ferrite, air loop

transformer)

No

No

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Table 3. Si47xx-EVB Kit Unique Contents (Continued)

Adapters

EVB Kit Si4735-EVB

Base Daughtercard Antenna

Board

Cards

Si47xx Base board Rev1.3 or
later

Si473x Daughter Card Rev1.2 or later

SW antenna

Antennas BNC Male to RCA Female

Whip

Yes

antenna

SMA Male to
BNC Female
No

SMA Female to BNC Male
No

SMA Male to
SMA Male
No

Si4737-EVB Si47xx

Si473x

WB antenna Whip

Yes

No

Base board Daughter

antenna

Rev1.3 or Card Rev1.2

later

or later

Si4743-EVB Si47xx

Si474x

Antenna

Whip

Yes

Yes

Base board Daughter

Dummy

antenna

Rev1.3 or Card Rev1.3

later

or later

No

No

No

Yes

Si4749-EVB Si47xx

Si4749

—

Whip

Yes

No

Yes

No

Base board Daughter

antenna

Rev1.3 or Card Rev1.0

later

or later

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Si47xx-EVB

Description

Si47xx EVB consists of a baseboard, a daughtercard with the Si47xx part pre- mounted, and, if applicable, an antenna card. The baseboard is common and shared among all Si47xx EVBs. The following sections refer to both the images in the figures and the silkscreen on the Si47xx EVB. Please refer to both when using this guide.
2.1. Si47xx Baseboard
J6

J27

J30

J52 J57 X1

J54

J61

J68

J69

J75 J76

U22 D1 J79 J74 PB1 SW1 J78

J77

Figure 1. Baseboard Connectors, Jumpers, and Devices

Baseboard power connectors/devices: J79 USB connector (using USB power) J78 External power connector J77 Battery connector J76 Terminal block (TB) power connector SW1 Switch to select between USB power or Ext power J61 Jumper: Baseboard power select (3.3 V or TB) J68 Jumper: Si47xx VIO power select (3.3 V or adjustable voltage via R73 or TB) J69 Jumper: Si47xx VDD power select (3.3 V or adjustable voltage via R74 or TB)

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Baseboard audio I/O connectors: J6 RCA output J30 Line output Note: Line output will not be supported on new EVBs as of February 14, 2011.
Baseboard clock connectors/devices: X1 32.768 kHz crystal oscillator J52 Solder bump: select internal RCLK from oscillator J54 Ext RCLK SMA connector input J57 Jumper: Enable or Disable Int RCLK
Baseboard MCU connectors/devices: U22 C8051F342 MCU J79 USB connector to communicate with the MCU J74 JTAG connector for the MCU PB1 Push button to reset the MCU D1 LED to confirm power supply to the MCU
Baseboard to Daughtercard connectors: J27 Si47xx daughtercard connector J75 Expansion card connector (reserved)
2.1.1. Power Supply Network
Vmcu

Si47xx-EVB
Daughterboard

Vm +3.3 V

J79 USB
J78 EXT
J77 BATT

SW1

LDO +3.3 V (U17)
LDO 1.25­3.9 V
(R73)
LDO 1.25­7 V
(R74)

ADJ

Jumper J61
Jumper J68
Jumper J69

ADJ

TB +3.3 V

TB

VIO VDD

TB +3.3 V Gnd

Vio

Vdd

J76 Terminal Block (TB)
Figure 2. Power Supply Block Diagram

Si47xx
11 VDD 10
VIO

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Si47xx-EVB

The Si47xx EVB can be powered using one of the following power supply options:

1. USB power supply via J79 2. External dc (Ext DC) power supply via power jack J78 or battery via J77 3. Three separate power supplies (Vdd, Vio, Vmcu) via terminal block J76
   The EVB has three supply rails: Vdd, Vio, and Vmcu. Vdd and Vio are routed directly to the daughtercard to power the Vdd and Vio pins on the Si47xx chip, while Vmcu is used to power the baseboard. The external dc power supply and battery should not be connected simultaneously. Refer to Section 9. “Using the EVB with a 9 V Battery,” on page 109 for more information. USB Power Supply & EXT DC Power Supply Switch SW1 is used to select between the USB power supply and Ext dc power supply. The USB power supply or the Ext dc power supply can be configured in one of the following two modes:
   1. Fixed +3.3 V 2. Adjustable Vdd and Vio
   Fixed +3.3 V Only one LDO is used in this mode which outputs a +3.3 V supply to all three rails (Vdd, Vio, and Vmcu). The jumpers need to be set according to Figure 3 to use the EVB in this configuration. This is the default configuration on the EVB.

Vio

Vdd

Vmcu

ADJ +3.3V
TB ADJ
+3.3V TB TB +3.3V

J68

J69

J61

Figure 3. Default Fixed +3.3 V Jumpers Setting
Terminal Block Power Supply If the terminal block supplies are used, then jumpers J61, J68, and J69 need to be set according to Figure 4. The user then needs to connect three different power supplies for Vdd, Vio, and Vmcu.

Vio

Vdd

Vmcu

ADJ +3.3V
TB ADJ
+3.3V TB TB +3.3V

J68

J69

J61

Figure 4. Terminal Block Jumpers Setting

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2.1.2. Microcontroller

TC_BCLK (reserved for digital Rx )

Jumper J41

J79 USB
PB1 Reset
J74 JTAG

MCU C8051F342

MD_GPIO3 MS_GPIO2 MD_GPIO1
Jumper J65
MD_GP4

MS_RSTB

S_GPO3/DCLK SD_GPO1

MS_SENB MS_SCLK MS_SDIO

SEN~ SCLK SDIO

GPO1 GPO2 GPO3/ DCLK

Si47xx-EVB
Daughterboard
19 18 17
Si47xx
RST~ 5 678

Figure 5. MCU Block Diagram
The Si47xx EVB uses a Silicon Laboratories’ C8051F342 microcontroller to control the Si47xx and to provide USB connectivity from the host PC (via connector J79). The LED D1 illuminates to confirm that power is being properly supplied to the C8051F342 and firmware has loaded. Push-button PB1 manually resets the C8051F342. The JTAG connector J74 is used to program the C8051F342 at production time, and is not required thereafter.

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Si47xx-EVB
2.1.3. Reference Clock

Daughterboard

Jumper J57
DIS_INT_RCLK

X1 32.768 kHz INT RClk

Jumper

INT_RCLK

J52

EXT_RCLK

Si47xx
9 RCLK

J54 EXT RClk

Figure 6. Reference Clock Block Diagram
The Si47xx accepts a 32.768 kHz reference clock at the RCLK pin. On the EVB, this clock is provided by a precision crystal oscillator. The user has the option of not using the onboard oscillator and bringing in the reference clock from an external source through SMA connector J54.
When the user chooses to provide an external RCLK, jumper J52 has to be set accordingly. The user has the option to turn off the onboard crystal oscillator by installing jumper J57.
2.1.4. Audio I/O

EVB In (TX only)
TX: Analog/Digital In

47xx Audio2
TX: Analog In RX: Digital Out

47xx Audio1
TX: Digital In RX: Analog Out

EVB Out (RX only)
RX: Analog/Digital Out

J7 RCA In

Jumper J5&J13

Audio2 Select

AUDIO2

AUDIO1

Audio1 Select

J19 Line In (white)
J19 SPDIF In (white)

1

16 LIN/ DFS2 LOUT/ DFS1 14

0

0

0

15 RIN/ DOUT ROUT/ DIN 13

1

1

CODEC IN LINE DOUT IN

0

To_TX

AUDIO2

1
S/PDIF IN

SPDIF IN

DOUT

Digital Input Select

Jumper

J45

From_RX

Si47xx (Daughterboard)

AUDIO1

To_TX

Jumper J44

CODEC OUT DIN LINE
OUT From_RX
S/PDIF OUT SPDIF
DIN OUT

Note: Jumper J44 and J45 are automatically configured in EVB Rev 1.3.

J6 RCA Out
J30 Line Out (black)
J30 SPDIF Out
(black)

Figure 7. Audio I/O Block Diagram

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Si47xx-EVB
The EVB supports three different kinds of configurations for the FM transmitter: Analog In to Analog In Analog In to Digital In Digital In to Digital In
Analog In to Analog In: This configuration provides a way for the user to evaluate the analog audio input for FM transmission. The input to the EVB is an analog audio provided via the RCA input connector J7 or LINE In connector J19 (white). Jumpers J5 and J13 are set to RCA input by default. The user has to change this jumper accordingly if LINE In is being used. Then the analog audio input is routed directly through a switch to the Si47xx Rin/Lin inputs pin 15 and 16 (Audio2).
Analog In to Digital In: This configuration provides a way for the user to evaluate the Si47xx digital audio input for FM transmission using an analog audio input. The input to the EVB is an analog audio provided via the RCA input connector J7 or LINE In connector J19 (white). Jumpers J5 and J13 are set to RCA input by default. The user has to change this jumper accordingly if LINE In is being used. Then the analog audio input is converted by CODEC U10 to a serial audio digital data before it is routed to the Si47xx digital audio input DIO and DFS pin 13 and 14 (Audio1). The DCLK input is routed to the GPO3/DCLK pin 17. Make sure that jumper J41 is set to DCLK to ensure proper operation.
Digital In to Digital In: This configuration provides a way for the user to evaluate the Si47xx digital audio input for FM transmission using S/PDIF digital audio commonly found in sound cards. The input to the EVB is a digital S/PDIF data provided via the S/PDIF In connector J19 (white). The digital S/PDIF input is converted by S/PDIF Translator U9 to a serial audio digital data before it is routed to the Si47xx digital audio input DIO and DFS pin 13 and 14 (Audio1). The DCLK input is routed to the GPO3/DCLK pin 17. Make sure that jumper J41 is set to DCLK to ensure proper operation. Note: Digital in through J19 will not be supported on new EVBs as of February 14, 2011.
The EVB supports three different kinds of configurations for the FM receiver: Analog Out to Analog Out Digital Out to Digital and Analog Out Dual Output (Digital and Analog Out)
Analog Out to Analog Out: This configuration provides a way for the user to evaluate the analog audio output for receiver operation. The output of the Si47xx is routed to RCA output connector J6 and Line output connector J30.
Digital Out to Digital and Analog Out: This configuration provides a way for the user to evaluate the digital audio output for FM and AM receive using either S/PDIF digital audio or analog audio through the onboard CODEC. The Si47xx digital audio out is routed through the S/PDIF translator µ9 to S/PDIF output connector J30 and routed through the CODEC to RCA output connector J6 and line output connector J30. Note: Digital output through J30 will not be supported on new EVBs as of February 14, 2011.
Dual Output (Digital and Analog Out): This configuration provides a way for the user to evaluate the analog audio out and digital audio using S/PDIF digital audio for FM and AM. The analog output of the Si47xx is routed to RCA output connector J6 and line output connector J30 and the digital audio out is routed through the S/PDIF translator to S/PDIF output connector J30. Note: Digital output through J30 will not be supported on new EVBs as of February 14, 2011.

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Si47xx-EVB
IMPORTANT: Jumper Settings Because of the many possibilities available to configure the EVB, ensure that these four jumpers are set accordingly:
1. J41: GPO3/DCLK setting 2. J44: TX/RX setting for Audio1 I/O (automatically set by the GUI for baseboard 1.3 and later) 3. J45: TX/RX setting for Audio2 I/O (automatically set by the GUI for baseboard 1.3 and later) 4. J5, J13: Analog Audio Source, RCA or Line In
J41: GPO3/DCLK Setting Upper–DCLK digital audio clock Lower–GPO3 digital control signal For configuring the Si47xx digital audio input, make sure that the jumper is set in the Upper position so that the DCLK signal will be routed to the Si47xx.
J44: TX/RX Setting for Audio1 I/O (automatically set by the GUI for baseboard 1.3 and later) Upper–Audio1 is set to FM transmit (pin 13 and 14 will be the digital audio input). Lower–Audio1 is set for FM receive (pin 13 and 14 will be analog/digital audio output).
J45: TX/RX Setting for Audio2 I/O (automatically set by the GUI for baseboard 1.3 and later) Upper–Audio2 is set to FM transmit (pin 15 and 16 will be the analog/digital audio input). Lower–Audio2 is set for FM receive (pin 15 and 16 will be the digital audio output).
J5, J13: Analog Audio Source, RCA or Line In Upper–RCA inputs are used for analog audio source. Lower–Line inputs are used for analog audio source.

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2.2. Si47xx Daughtercards
2.2.1. Si471x/2x Daughtercard

Si47xx-EVB

Figure 8. Si471x/2x Daughtercard Connectors and Devices
Daughtercard Connectors and Components: U1 Si472x FM Transceiver or Si470x FM Receiver or Si471x FM Transmitter L2 Tuning Inductor R2 0 resistor to connect FM TX output to 10 cm trace built-in antenna C8 2 pF capacitor to connect FM TX output to J1 SMA connector R4 50 termination resistor J1 SMA connector for FM transmitter output or FM receiver input for embedded antenna J2 Header for putting external antenna for FM transmitter or embedded antenna for FM receiver J28 SMA connector for FM receiver input J29 Headphone jack for FM receiver

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Si47xx-EVB
Figure 9. Fully Assembled Si471x/2x EVB
Si470x/1x/2x EVBs use Si471x/2x daughtercard with different population options depending on the individual Si470x/1x/2x part. Please refer to individual Bill of Materials for each board.

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2.2.2. Si473x Daughtercard

Si47xx-EVB

Figure 10. Si473x Daughtercard Connectors and Devices

Daughtercard connectors and components:

J1

SMA connector for AM test circuit (does not apply to Si4707-EVB)

J2 Header for antenna interface connection J24 Headphone jack J26 SMA connector for FM test circuit L4 270 nH inductor for FM input U1 Si473x AM/FM/SW Weather Band Receiver chip (or Si4707 WB/Same receiver for Si4707-EVB only) C2 Vdd bypass capacitor C3 FM test circuit ac coupling capacitor C8 AM input ac coupling capacitor C12 FM input ac coupling capacitor C13 AM test circuit ac coupling capacitor

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Si47xx-EVB
Figure 11. Fully Assembled Si473x-EVB with Ferrite Antenna Card
The Si473x/07 EVBs use Si473x daughtercard with different population options depending on the individual Si473x/07 part. Please refer to individual Bill of Materials for each card. Table 4 shows the antenna and audio connections for the Si47xx EVBs.

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2.2.3. Si474x Daughtercard

Si47xx-EVB

Figure 12. Si474x Daughtercard Connectors and Devices

Daughtercard connectors and components:

J4

BNC connector for antenna connection

C6, C1, C18

Vdd bypass capacitor

C2

FM matching component

L1, L5

FM matching component

Q1­2

Cascode amplifier for AM front-end boost circuit.

U1

Si4740/41/42/43 AM/FM Receiver chip

The daughtercard implements the Si4740/41/42/43 AM/FM RDS receive solution.

The Si474x daughtercard also has a cascode amplifier circuit made up of two transistors to provide gain boost for AM front-end. The on-chip De-Q resistors will then be used to adjust the overall circuit gain. In cases where the AM reception is too strong, the front-end attenuators can be engaged by using GPIO1 as the control signal.

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Si47xx-EVB

Figure 13. Fully Assembled Si474x-EVB

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2.2.4. Si4749 Daughtercard

Si47xx-EVB

Figure 14. Si4749 Daughtercard Connectors and Devices
Daughtercard connectors and components: J1 SMA connector for pass-thru FM connection J2 SMA connector for FM antenna connection C2 Vdd bypass capacitor L1 FM matching component U2 Si4749 RDS Receiver The daughtercard implements the Si4749 RDS receive solution. The SMA connector, J2, allows the user to attach a whip antenna for FM reception or a signal generator for FM test circuit. A pass-thru connection, J1, is also present to provide the FM signal to other FM receivers if necessary.

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Si47xx-EVB
Figure 15. Fully Assembled Si4749-EVB

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2.2.5. Antenna Interfaces 2.2.5.1. AM Antenna Interface

Si47xx-EVB

Figure 16. Antenna Board Options–SL4X30MW100T (Medium Ferrite), SL5X7X100MW70T (Large Ferrite), and SL9X5X4MWTF Airloop
The user has the flexibility of choosing one of the two available antenna options. The user can either decide to use the airloop antenna or the ferrite loop stick antenna.

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Si47xx-EVB
2.2.5.2. SW and Weather Band Antenna Interfaces

Figure 17. SW/WB Antenna Card (SW Population) and (WB Population)
The BNC connector, J2, will be used to connect a whip antenna for shortwave, FM, and weather band reception. For SW reception, switch S1 must be in the SW position. The ferrite bar is used for AM reception, and the switch S1 must be in the AM position for AM reception. When using the WB Antenna Card, WB reception is through the whip antenna. For a better listening experience, plug the headphones to J30 rather than J24. Note: LW not supported with SW/WB Antenna Card. 2.2.5.3. Si474x Antenna Dummy Card

Figure 18. Si474x Antenna Dummy Card

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Table 4. Si47xx Antenna Connections

EVB Kit Name
Si4705-XEVB
Si4706-XEVB
Si4707-BEVB
Si4713-BEVB

Receiver AM Antenna Options

AM Connections

FM Antenna Options

FM

SW Antenna

Connections Options

SW Connections

Si4705

None

Si4706

None

Si4707

None

None

Head-

J29

phone

Trace

J2

None

Head-

J29

phone

Trace

J2

None

None

None None None

Si4713

None

None

Trace

J2

None

WB Antenna Options None
None
Headphone Whip/SAME Antenna Card

WB Connections
J24 J2

Si4721-BEVB

Si4721

None

None

Head-

J29

phone

None

Trace

J2

Si4731-X- Si4731 SL5X7X100M

J2

EVB

W70T Ferrite

/ Large Ferrite

Head-

J24

phone

None

SL4X30MW1

J2

10T Ferrite /

Medium Fer-

rite

SL9X5X4MW

J2

TF Autotrans-

former / Air

loop

Si4735-X- Si4735 SL5X7X100M

J2

EVB

W70T Ferrite

/ SW Antenna

card

Headphone

J24

Whip/SW

J2

Antenna Card

Whip/SW Antenna
Card

J2

For SW recep-

tion, set the

S1 switch to

SW position.

LW is not sup-

ported by the

SW antenna

card.

Si4737-X- Si4737 SL5X7X100M

J2

EVB

W70T Ferrite

/ WB Antenna

card

Head-

J24

phone

None

Headphone

J24

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Table 4. Si47xx Antenna Connections (Continued)

EVB Kit Name
Si4743-CEVB
Si4749-CEVB

Receiver AM Antenna

AM

Options Connections

Si4743 Si4749

Whip / Si474x Antenna
Dummy card
None

J4 None

FM

FM

SW Antenna

SW

Antenna Connections Options Connections

Options

Whip/WB

J2

Antenna

Card

Whip

J4

Whip

J2

Whip None

WB Antenna Options
Whip/WB Antenna Card. For WB reception, set the S1 switch to WB
position

WB Connections
J2

EVB Kit Name Si4705-X-EVB Si4706-X-EVB Si4707-B-EVB Si4713-B-EVB

Receiver Si4705 Si4706 Si4707 Si4713

Table 5. Si47xx Audio Connections

Audio Out Options Headphone
Unity Gain Buffer / RCA Headphone
Unity Gain Buffer / RCA Headphone
Unity Gain Buffer / RCA None

Audio Out Connections J29
J6 (Baseboard) J29
J6 (Baseboard) J29
J6 (Baseboard) None

Audio In Options None None None
Unity Gain Buffer / RCA

Audio Connections None None None
J7 (Baseboard)

Si4721-B-EVB Si4731-X-EVB

Si4721 Si4731

Headphone Unity Gain Buffer / RCA
Headphone Unity Gain Buffer / RCA

J29 J6 (Baseboard)
J24 J6 (Baseboard)

Unity Gain Buffer / RCA None

J7 (Baseboard) None

Si4735-X-EVB
Si4737-X-EVB
Si4743-C-EVB Si4749-C-EVB

Si4735
Si4737
Si4743 Si4749

Headphone Unity Gain Buffer / RCA
Headphone Unity Gain Buffer / RCA Unity Gain Buffer / RCA
None

J24 J6 (Baseboard)
J24 J6 (Baseboard) J6 (Baseboard)
None

None
None
None None

None
None
None None

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2.2.6. Test Circuit Interfaces Table 6 shows the test circuit interface connections for Si47xx EVBs.

Table 6. Si47xx Test Circuit Connections

EVB Kit Name

Receiver

AM/SW/LW Test
Options

AM/SW/LW Connections

FM Test Options

FM Connections Audio Out

Audio Out

Test Options Connections

Audio In Test
Options

Audio In Connections

Si4705-X-EVB
Si4706-X-EVB
Si4707-B-EVB Si4713-B-EVB* Si4721-B-EVB
Si4731-X-EVB Si4735-X-EVB Si4737-X-EVB Si4743-C-EVB Si4749-C-EVB

Si4705
Si4706
Si4707 Si4713 Si4721
Si4731 Si4735 Si4737 Si4743 Si4749

None
None
None None None
AMI / SMA AMI / SMA AMI / SMA AMI / BNC
None

None
None
None
None
None
J1 through C13, remove C8 for best
sensitivity J1 through C13, remove C8 for best sensitivity J1 through C13, remove C8 for best sensitivity
J4
None

FMI / SMA LPI / SMA FMI / SMA LPI / SMA FMI / SMA LPI / SMA FMI / SMA LPI / SMA FMI / SMA
FMI / SMA
FMI / SMA
FMI / BNC FMI / SMA

J28 through C1. Remove C9 for best sensitivity
J1 J28 through C1. Remove C9 for best sensitivity
J1 J26
J1
J28 through C1. Remove C9 for best sensitivity
J1 J26 through C3. Remove C12 for best sensitivity
J26 through C3. Remove C12 for best sensitivity
J26 through C3. Remove C12 for best sensitivity
J4
J2

Unity Gain J6 (Baseboard) Buffer / RCA

None

Unity Gain J6 (Baseboard) Buffer / RCA

None

Unity Gain Buffer / RCA
None
Unity Gain Buffer / RCA

J6 (Baseboard)

None

None

Unity Gain Buffer / RCA

J6 (Baseboard) Unity Gain Buffer / RCA

Unity Gain J6 (Baseboard) Buffer / RCA

None

Unity Gain J6 (Baseboard) Buffer / RCA

None

Unity Gain J6 (Baseboard) Buffer / RCA

None

Unity Gain Buffer / RCA
None

J6 (Baseboard) None

None None

None
None
None J7 J7
None None None None None

*Note: The FM RF output will be available through the SMA connector J1. Refer to Table 7.

Table 7. FM Band Attenuation Factors

Frequency (MHz) 76 88 98 108

Attenuation (dB) 32.13 30.91 30 29.2

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Recommended Hardware Setup

The Si47xx-EVB can be configured for FM transmit, FM receive, WB receive, or AM/SW/LW receive. The following is a description of how to correctly configure the device for either mode of operation.
3.1. Hardware Setup for FM Transmitter Test

RF Analyzer
SMA Cable
J1 FM OUT

J28 FM IN

Si471x/2x Daughterboard

Si47xx Baseboard

Analog Audio Generator
RCA Cable

J6 RCA OUT

J7 RCA IN

Jumpers Setting

DCLK

TX

TX

GPIO3 J41

RX

RX

J44 J45

Note: J44 and J45 are automatically configured in
EVB Rev1.3 and later

J19

S/PDIF

Audio

Generator

J30

J76

USB

SW1

EXT pwr

Terminal Block (TB)

J79 USB Cable

USB pwr

J78 EXT Jack

PC w/ USB
port
Figure 19. Hardware Setup for FM Transmitter Test
Instructions for Si471x/2x daughtercards: 1. Connect the USB cable from PC to the EVB USB connector J79. The USB connection will serve as a dual purpose:
supplying the power to the EVB and controlling the EVB. 2. Connect an analog audio generator to the RCA input connector J7 using an RCA cable or connect an SPDIF digital audio
generator to connector J19 using an SPDIF cable. 3. Connect an RF analyzer from the FM output SMA connector J1 using an SMA cable. 4. J19 and J30 S/PDIF connections are no longer supported on EVBs as of February 14, 2011.

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3.2. Hardware Setup for FM or Weather Band Receiver Test

Si47xx-EVB

RF Generator
SMA Cable

Audio Analyzer
RCA Cable

J28 or J26 FM IN
Si47xx Daughterboard

J6 RCA OUT

J7 RCA IN
J19

Optical Cable

Jumpers Setting

DCLK

TX

TX

GPIO3 J41

RX

RX

J44 J45

Note: J44 and J45 are automatically configured in
EVB Rev1.3 and later

S/PDIF OUT
J30

Si47xx Baseboard

J76

USB

SW1

EXT pwr

Terminal Block (TB)

J79 USB Cable

USB pwr

J78 EXT Jack

PC w/ USB
port
Figure 20. Hardware Setup for FM/Weather Band Receiver Test
Instructions for Si4704/05/06/2x/3x/8x daughtercards: 1. Connect the USB cable from PC to the EVB USB connector J79. The USB connection will serve as a dual purpose,
supplying the power to the EVB and controlling the EVB. 2. Connect an audio analyzer from the RCA output connector J6 using an RCA cable. 3. Connect an RF generator to the FM input SMA connector J28 or J26 using an SMA cable. 4. Connect an audio analyzer to the S/PDIF output connector, J30, using an optical cable. 5. To avoid possible sources of interference, please remove C9 or C12 (depending on the daughtercard). This will
disconnect the headphone circuit from the test circuit. 6. J19 and J30 S/PDIF connections are no longer supported on EVBs as of February 14, 2011.

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3.3. Hardware Setup for AM Receiver Test

Audio Analyzer

RCA Cable

J28 or J26 J24 FMIN

RF Generator
SMA Cable

Si473x J1 Daughterboard

J6 RCA OUT

J7 RCA IN
J19

Optical Cable

Jumpers Setting

DCLK

TX

TX

GPIO3

RX

RX

J41

J44 J45

Note: J44 and J45 are automatically configured in
EVB Rev1.3 and later

S/PDIF OUT
J30

Si47xx Baseboard

J76

USB

SW1

EXT pwr

Terminal Block (TB)

J79

USB pwr

USB Cable

J78 EXT Jack

PC w/ USB
port
Figure 21. Hardware Setup for AM Receiver Test (Si473x)
Instructions for Si473x daughtercards. 1. Connect the USB cable from PC to the EVB USB connector, J79. The USB connection will not only allow controlling of the
EVB, but will also provide power to the EVB. 2. Connect either the ferrite antenna or the airloop antenna board. The user also has the option of using the AM test input for
characterization by connecting the AM test input connector J1 to an RF generator source. 3. Connect an audio analyzer to the RCA output (connector J6) using an RCA cable for the analog audio output. 4. Connect an audio analyzer to the S/PDIF output (connector J30) using an optical cable. 5. Or, connect the headphone output to J24 on the daughtercard. 6. J19 and J30 S/PDIF connections are no longer supported on EVBs as of February 14, 2011.

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AM IN

J4

RF Generator

Antenna Dummy

Si474x Daughterboard

AM Test Setup

Audio Analyzer/ Amplifier
RCA Cable
J6 RCA OUT

Optical Cable
J19

S/PDIF OUT J30

Si47xx Baseboard

USB

SW1

EXT pwr

J76
Terminal Block (TB)

J79 USB Cable

USB pwr

J77 EXT Jack

PC w/ USB
port
Figure 22. Hardware Setup for AM Receiver Test (Si474x)
Instructions for Si474x daughtercards: 1. Connect the USB cable from PC to the EVB USB connector, J79. The USB connection will serve two purposes: supplying
the power to the EVB and controlling the EVB. 2. Connect a whip antenna to J4. The user has the option of using the AM test input for characterization by connecting the AM
test input connector J4 to an RF generator source through an antenna dummy. 3. Connect an audio analyzer to the RCA output (connector J6) using an RCA cable for the analog audio output. 4. Connect an audio analyzer to the S/PDIF output (connector J30) using an optical cable. 5. J19 and J30 S/PDIF connections are no longer supported on EVBs as of February 14, 2011.

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Getting Started

4.1. Software Installation
The Si47xx Windows GUI (graphical user interface) software is designed for use with the Si47xx evaluation board
(EVB). The GUI software revision number is available under HelpAbout.
The GUI software development program uses a host machine USB port to communicate with the Si47xx EVB and is tested for use with Windows XP, Windows 2000, and Windows 7. To install, insert the Silicon Laboratories Si47xx CD into the host machine CD drive and launch Windows Explorer. Open the CD to explore the contents in a window like the one shown in Figure 23.

Figure 23. Installation and Setup Screen
Important: Open and read the Readme.doc file at this point. It may contain information that is not captured here, and which could be very important to the functionality of the EVB or software.
Run the Setup.Exe and follow the instructions on the screen.
Note: If you get this Error message: “This setup requires the .NET Framework version 4.0,” then you should install the .NET Framework that is provided on the CD and re-run the setup. The GUI requires version 4.0; however, multiple versions such as 2.0, 3.0, and 5.0 can be installed simultaneously.
After installation is finished, a Silicon Labs Audio GUI icon will appear on your desktop. Launch the software by clicking this icon on the desktop as shown in Figure 24.

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Figure 24. Launching the GUI
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4.2. Board Initialization
After launching the GUI, you will be shown the initialization window as shown in Figure 25. Note: This window can be accessed at any time by choosing Initialize from the File menu from the main GUI screen.

Figure 25. GUI Initialization Screen
4.2.1. Board Selection
At the top of the initialization window there is a board selection box, as displayed in Figure 26, that allows the selection of the board that will be controlled by the GUI. This box is populated automatically and will update real time as boards are connected/removed from the PC. If no EVBs are listed in the board selection box, verify that an EVB is connected to the USB port of the PC running the GUI application.
After selecting the desired board the GUI will populate the rest of the dialog with options appropriate to the board selected. You will only see modes/options for the type of board that is currently selected.

Figure 26. Board Selection Box

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4.2.2. Board Discovery Bus Mode The initialize process can be configured to use either 2-wire or 3-wire bus mode. This can be configured by
selecting File Board Discovery Bus Mode.
This feature is useful when using the Silabs EVB and GUI to control a prototype that is designed to use one bus mode only. 4.2.3. Function Configuration For each mode available on the selected EVB, multiple configuration items (Figure 27) will be present to allow for configuration of the GUI software. It is possible to change these settings to meet testing requirements. The default configuration of the board when you connect it to the computer is acceptable for most users. After initialization, the GUI will save and restore these settings whenever the same type of board is connected.

Figure 27. Mode Configuration Items
4.2.3.1. Functions
Currently the UI supports four possible functions. These functions are AM Receiver, FM Receiver, WB Receiver, and FM Transmitter.
Each function is configured independently from other functions. It is important to configure all functions as desired as it is possible to have FM Receive boot in digital mode while AM Receive boots in analog mode.
The currently highlighted function row will be the function that is initialized when the Initialize button is selected. Settings for other functions that are not selected will be saved and used to initialize that function when choosing another function from the UI main window.
4.2.3.2. Boot Mode
There are two boot modes possible for each function. It is possible for some boot modes to not be available on some boards.
From Device–This option will use the firmware embedded on the device selected. This is the faster of the two options.
From File–This option will use the patch functionality of the device to send firmware from a file stored within the UI to the device. If using this option, choose the appropriate firmware in the Firmware column for the function you are configuring.

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4.2.3.3. Default Mode There are two or more default modes possible for each function.
Use Last UI State: When selected, the GUI will restore all settings on the device to the previous settings configured in the GUI the last time it was closed.
Use Chip Defaults: When selected, the GUI will use the settings that were default in the firmware on the device. Only properties related to the correct setting of RCLK (such as frequency and prescaling) and initial tuning (such as frequency) will be changed. If an error occurs during initialization of a function, choose this setting to default the GUI settings back to the chip defaults.
Saved Configuration States: If you have previously saved or imported any configuration states, they will be listed by name. When one of these is selected, the GUI will restore all settings on the device to the previously saved settings.
4.2.3.4. Audio Mode This option allows the user to change between Analog or Digital modes if the board connected supports digital. Sections 2.1.4, 5, 6, and 7 each document the possible settings in more detail depending on what function is being configured. Figure 28 displays the window after the Details button has been pressed which helps with selection of the Audio Mode by displaying a bitmap of the current audio setting in the dialog.

Figure 28. Expanded Details Dialog
4.2.3.5. Firmware This selection is only required if “From File” was chosen for the Boot Mode. Use this setting to choose which firmware will be downloaded to the device. If this item turns red then there is no firmware available for the function so “From Device” must be chosen as the Boot Mode.

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4.2.3.6. Bus Mode This setting affects all functions that are configured. It allows the device to be booted either in 2-wire or 3-wire mode. 4.2.3.7. Internal Oscillator When the “Use XOSCEN” is enabled and the board is configured to use the crystal oscillator, the GUI will boot the device using the crystal oscillator. This option is only available on devices that support the crystal oscillator option. 4.2.3.8. Auto Boot when UI Opened and only One Board is Connected When this item is selected, the GUI, when launched, will automatically boot the board if the same board is connected. If more than one board is connected, the GUI will display the initialization dialog to allow selection of the board to initialize.
4.3. Switching Functions
After the board has been properly configured for all functions it is possible to switch between functions from the main UI window using the function buttons provided. Only function buttons will appear for the functions supported by the device currently running. Figure 29 highlights the buttons used to switch functions from the main screen.
Figure 29. Function Switch Buttons

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4.4. State Management
Once the part has been initialized, a State Management option becomes available in the File Menu. This GUI feature allows the user to save, retrieve, load, and delete the configuration state which contains the property values. 4.4.1. Save Configuration State
To save the current configuration state, select FileState ManagementSave Current State. The Select
Configuration window shown in Figure 30 will pop up. Enter a name for the configuration state and click OK. The current state that contains the property values is now saved under the given name. If a state already exists with the chosen name, the GUI will give you the option of replacing the original state, entering a different name, or canceling the save.

Figure 30. Naming a Configuration State during Save
4.4.2. Retrieve Configuration State Once a configuration state for a part has been saved, it will appear in the Default Mode list in the Initialization window as shown in Figure 31. Select the state you wish to retrieve when initializing the part, and all properties and the tuning frequency of the saved configuration will be restored.

Figure 31. Saved Configuration State

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4.4.3. Load Configuration State When a configuration state for a part has been saved, it will also appear in the Load State list as shown in Figure 32. Select the state you wish to load, and all properties and the tuning frequency of the saved configuration will be restored without doing initialization to the chip.

Figure 32. Loading Configuration State
4.4.4. Delete Configuration State
To discard a saved configuration state, select FileState ManagementDelete State. The Delete Configuration
window shown in Figure 33 will pop up. Select the configuration state you want to delete from the list and click OK. The deleted configuration state will no longer be available in the Default Mode list of the Initialization window or available for export.

Figure 33. Selecting Configuration State to Delete

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4.4.5. Export Saved State In addition to saving, retrieving, and deleting the configuration state, the GUI also gives the end user the ability to export the configuration state to a file. The file can then be imported to installations of the GUI on different machines to allow multiple users to easily implement the same configuration state. To export a saved configuration
state to a file, select File State ManagementExport Saved State and the Select Configuration window will pop
as shown in Figure 34. Select the configuration state to export and click OK to save the configuration file with a .ini extension. This configuration file can now be exported to different machines. The name of the saved state is retained in the file when exported.

Figure 34. Selecting Configuration State to Export
4.4.6. Import Saved State
A saved configuration state can be imported from a .ini file exported by another instance of the GUI. To import a
saved state, select FileState Management Import State File, then browse for and select the desired file. Once
the file has been imported, the saved state will appear in the Default Mode list in the Initialization window. If a state already exists with the same name as the state in the imported file, the GUI will give you the option of replacing the original state, choosing a new name for the imported state, or canceling the import from file. The name appearing in the initialization window will not necessarily be the same as the *.ini file name exported. It will reflect the name of the original state that was exported.
4.5. Disconnecting the EVB
The GUI provides three methods for disconnecting the device: Closing the GUI, choosing disconnect from the file menu, or physically disconnecting the device from the PC.
When closing the UI or selecting disconnect from the file menu, the GUI will prompt if the device should be powered down or not. This prompt allows for further investigation of the device after the GUI has been disconnected from the EVB. After the board has been disconnected through the File menu, the GUI will save the current state of the device to disk. This state will be used to power up the device in the same state next time the board is connected. The GUI will only save the current state if the board is disconnected through the File menu or the GUI application is closed. If the board is removed from the PC without being disconnected through the File menu and before the GUI is closed, then all state data will be lost.

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FM Transmitter GUI

The first Si47xx window is the Initialization window as shown in Figure 35. Select the FM transmitter function. As an FM transmitter, there are three audio input settings available:
Analog Input Analog to Digital Input Digital Input
5.1. Configuring the Si47xx as an FM Transmitter Using Analog Audio Input
This mode configures the Si47xx to receive analog audio input at pins 15 and 16 (LIN and RIN). The user has the ability to provide analog audio from RCA In connector (J7) or Line In (J19). Set jumpers J5 and J13 accordingly. Figure 35 shows the configuration setting for analog audio input. Configure the desired parameters in the initialization screen and then click Initialize. A new window displaying “Initializing FM Transmitter” will appear.

Figure 35. Configuring the Si47xx to Transmit Analog Input

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5.2. Configuring the Si47xx as an FM Transmitter Using Digital Audio with Analog Audio Source
This mode configures the Si47xx to receive digital audio input at pins 13 and 14 (DIN and DFS), but the user still provides an analog audio source to the EVB. It is useful for a user who wants to test digital input on the Si47xx but does not have a digital audio source. The analog audio source is converted to digital audio through the CODEC, which can be configured to output various digital audio formats. Refer to Figure 41, “CODEC Settings Property Window,” on page 49 to control the CODEC. Configure the desired parameters in the initialization screen and then click Initialize. A new window displaying “Initializing FM Transmitter” will appear.

Figure 36. Configuring the Si47xx to Transmit Digital Input by Using Analog Source (CODEC)

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5.3. Configuring the Si47xx as an FM Transmitter Using Digital Audio with SPDIF Digital Source
This mode configures the Si47xx to receive digital audio input at pin 13 and 14 (DIN and DFS) when the user has an SPDIF digital audio source. The SPDIF source is converted to PCM digital audio by the SPDIF translator. Refer to Figure 42, “SPDIF Settings Property Window,” on page 50 to control the SPDIF translator. Note: The Si47xx requires the digital audio signal to be present when initializing the part. Therefore, connect the SPDIF IN
signal prior to initializing the part. SPDIF will not be supported on new EVBs as of February 14, 2011. This mode of operation will not be available in the initialization window for those boards.

Figure 37. Configuring the Si47xx to Transmit Digital Input by Using Digital Source (SPDIF)

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5.4. FM Transmitter Main Window
The FM transmitter main window will appear after initialization.

Si47xx-EVB

1 2
3 7
9 10 11 12

4
13 14
15 16

5
17 25

26
8
18 19
20 21 22
24 23

6

Figure 38. FM Transmitter Main Window

Table 8. FM Transmitter Main Window Descriptions

Description

1 Transmit frequency display. Enter the desired FM transmit frequency in this window.

2 Transmit voltage display. Enter the desired FM transmit voltage in this window.

3 Varactor Value. This is an indicator showing the tuning cap value of the Si472x device. Each number represents 0.25 pF. If the varactor value is manually overwritten in the property window, the indicator will change from automatic mode to manual mode.

4 RF on or off. Selecting this checkbox will enable the FM transmit, while turning this button off will disable the FM transmit.

5 Pre-Emphasis. Click one of the three buttons to set the pre-emphasis either to Off, 50 µs or 75 µs.

6 Si472x EVB audio input setting indicator: Analog In/Digital (Analog In to CODEC)/Digital (SPDIF).

7 Presets. Press and hold the desired preset button for 1.5 seconds to program. The current frequency will replace the preset number. Press for less than 1.5 seconds to tune to the displayed frequency. Presets can also be programmed automatically from the Receive Power Scan window.
8 Pilot Tone Generation. Set to 19 kHz and select “Pilot On” when in stereo mode. Set to 0­19 kHz for and select “Pilot On” for test tone generation.
9 Audio Deviation. Enter the desired audio deviation in this window.
10 Pilot Deviation. Enter the desired pilot deviation in this window.

Range 76­108 MHz 88­120 dBuV
1­191
On/Off
Off, 50 µs, 75 µs
Analog, Digital CODEC, Digital
SPDIF 76­108 MHz
0­19 kHz
0­90 kHz 0­90 kHz

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Table 8. FM Transmitter Main Window Descriptions (Continued)

Description

Range

11 RDS Deviation. Enter the desired RDS deviation in this window (Si4711/13/21 only). 12 Total Deviation. This is an indicator only displaying the sum of the audio, pilot and RDS
deviation. If the total deviation exceeds 75 kHz, the indicator will turn red and a warning sign is displayed. 13 Input Mute Left/Right. Selecting this checkbox will mute the Left or Right audio channel. 14 Turn on or off the pilot tone for stereo or mono FM transmit mode. 15 Turn on or off the RDS transmission (Si4711/13/21 only). 16 Modulation On. Selecting this checkbox will modulate the audio, pilot, and RDS signal according to the audio, pilot, and RDS deviation. De-selecting this checkbox will turn off modulation for all audio, pilot, and RDS signal and only the carrier will be transmitted. 17 Turn on or off the L-R channel for stereo or mono FM transmit mode. 18 Turn on or off the compressor for the audio signal. 19 Attack time. Set the attack time for the compressor in milliseconds. 20 Release time. Set the release time for the compressor in milliseconds. 21 Threshold. Set the threshold for the compressor. 22 Input Gain. Set the compressor gain. 23 Limiter Release Time. Set the limiter release time constant. (Not available in Si4710-A10).
24 Turn on or off the limiter feature. 25 Audio Level Indicators. Overmodulation, Limiter, Audio input level below low-level
threshold (silence detection), and Audio input level below high-level threshold (loud detection). To enable these four indicators, check the Enable Interrupts box. These indicators are sticky; to clear them, click the Reset button. 26 Mode switch buttons to switch between different modes on the device. See section 4 for more information.

0­7.5 kHz 0­187.5 kHz
On/Off On/Off On/Off On/Off
On/Off On/Off 0.5­5 ms 100­1000 ms ­40 to 0 dBFS 0 to 20 dB 0.5,1,2,3,4,5,6,7,8, 9,10,20,30,40,50, 75,100 ms On/Off

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5.5. FM Transmitter Settings (Analog Mode) Property Window FM transmitter settings can be configured through the properties window by selecting WindowProperties.
Properties are grouped into categories which can be selected from the drop- down box in the upper right of the
window. For convenience, all FM transmitter properties are also located in WindowPropertiesTX: All. Analog
mode properties will be available if Analog Mode was selected in the initialization window.

Figure 39. FM Transmitter Settings in Analog Mode Property Window

Table 9. FM Transmitter Settings in Analog Mode Property Window Descriptions

Item

Description

Range

Line Input Attenuation (k)

The Si47xx has four attenuator settings (636, 416, 301, and 190 mVp). It will tell the maximum audio input signal that the user can give to the LIN and RIN input. The attenuator setting will determine the audio input impedance (LIN and RIN) of the device.

190 mVp, 301 mVpk, 416 mVp, 636 mVpk

Maximum Line Input The maximum line input level of the max audio input 0­Line Input Attenu-

Level (mVpk) signal that the user supplies to the device. This num-

ation

ber has to be less than or equal to the attenuation set-

ting. The max line input level will correspond to the

max audio deviation set in the audio deviation window

on the main GUI. Make sure that the actual audio

input signal does not exceed this limit, otherwise the

audio signal will become distorted.

Reference Clock Frequency (Hz)

This field is used to specify the frequency of the reference clock. The input to the RCLK pin divided by the prescaler is the reference clock. The reference clock must be in the range of 31130 to 34406 Hz.

31130­34406 Hz

Devices All All
All

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Table 9. FM Transmitter Settings in Analog Mode Property Window Descriptions (Continued)

Item

Description

Reference Clock Prescaler

This field is used to specify the prescaler value. The input to the RCLK pin divided by the prescaler is the reference clock. The reference clock must be in the range of 31130 to 34406 Hz.

Audio Level High Set the duration for the audio level high before an Duration (mSec) interrupt is generated.

Audio Level High Threshold (dBFS)

An interrupt will be generated when the audio input level rises above this threshold for the duration greater than the Audio Level High Duration setting. This may also be called loud detection indicator.

Audio Level Low Set the duration for the audio level low before an interDuration (mSec) rupt is generated.

Audio Level Low Threshold (dBFS)

An interrupt will be generated when the audio input level falls below this threshold for the duration greater than the Audio Level Low Distortion setting. This may be called silence detection indicator.

Varactor Capacitor This field allows the user to manually overwrite the

Overwrite

tuning capacitance. A number 0 indicates that the

tuning cap is automatically adjusted. Any number

other than 0 (1 to 191) will indicate that the tuning cap

is manually adjusted.

Range 1­4095
0­65535 ­70 to 0
0­65535 ­70 to 0
Automatic: 0, Manual: 1­191

Devices All
All All
All All
All

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5.6. FM Transmitter Settings (Digital Mode) Property Window FM transmitter settings can be configured through the properties window by selecting WindowProperties.
Properties are grouped into categories which can be selected from the drop- down box in the upper right of the
window. For convenience, all FM transmitter properties are also located in WindowProperties TX: All. Digital
mode properties will be available if CODED or SPDIF modes was selected in the initialization window.

Figure 40. FM Transmitter Settings in Digital Mode Property Window

Table 10. FM Transmitter Settings in Digital Mode Property Window Descriptions

Item

Description

Range

Reference Clock Frequency (Hz)
Reference Clock Prescaler
Digital Format
Digital Sample Precision
Digital Sample Rate (Hz)

This field is used to specify the frequency of the reference clock. The input to the RCLK pin divided by the prescaler is the reference clock. The reference clock must be in the range of 31130 to 34406 Hz. This field is used to specify the prescaler value. The input to the RCLK pin divided by the prescaler is the reference clock. The reference clock must be in the range of 31130 to 34406 Hz. Sets I2S of left justified digital format.
Select the precision of the digital audio input.
Sets the DFS digital sample rate. Must be set to 0 Hz before DCLK/DFS is removed.

31130­34406 Hz
1­4095
Left-Justified, I2S, DSP (MSB on first
DCLK), or DSP (MSB on second
DCLK) 8, 16, 20, 24 bits
0, 32000­ 48000 Hz

Applicable Devices All
All
All except Si4710-A10
All All except Si4710-A10

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Table 10. FM Transmitter Settings in Digital Mode Property Window Descriptions (Continued)

Item

Description

Range

Digital Mono Select between Digital Stereo or Mono. Mode Enable

Digital DCLK Select between using rising edge or falling edge of Falling Edge DCLK when sampling Digital Input (DIN) data.

Audio Level Low An interrupt will be generated when the audio input Threshold (dBFS) level falls below this threshold for the duration greater
than the Audio Level Low Distortion setting. This may be called silence detection indicator.

Audio Level Low Set the duration for the audio level low before an Duration (mSec) interrupt is generated.

Audio Level High An interrupt will be generated when the audio input Threshold (dBFS) level rises above this threshold for the duration greater
than the Audio Level High Duration setting. This may also be called loud detection indicator.

Audio Level High Set the duration for the audio level high before an Duration (mSec) interrupt is generated.

Varactor Capacitor This field allows the user to manually overwrite the

Overwrite

tuning capacitance. 0 indicates that the tuning cap is

automatically adjusted. Any number other than 0 (1 to

191. will indicate that the tuning cap is manually

adjusted.

On/Off On/Off ­70 to 0
0­65535 ­70 to 0
0­65535 Automatic: 0 Manual: 1­191

Applicable Devices All All All
All All
All All

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5.7. CODEC Settings
In addition to other digital mode properties, a category of CODEC settings may configured by selecting
WindowPropertiesCODEC Settings if CODEC mode was selected in the initialization window.

Figure 41. CODEC Settings Property Window

Table 11. CODEC Settings Property Window Descriptions

Item

Description

Range

Misc.

CODEC Precision Select the CODEC digital audio output precision.

16, 20, 24 bits

CODEC Output Format Select the CODEC digital audio format between I2S, Left Justi- Left-Justified, I2S, DSP

fied, DSP (MSB on first DCLK), or DSP (MSB on second DCLK). (MSB on first DCLK), or

DSP (MSB on second

DCLK)

CODEC Sampling Rate Select the sample rate of the CODEC digital audio output.

32 or 48 kHz

CODEC Channel Swap Select whether the CODEC digital output L-R data is normal or swapped.

On/Off

CODEC Invert Clock Select between using rising edge or falling edge of DCLK when sampling Digital Input (DIN) data.

On/Off

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5.8. SPDIF Settings
In addition to other digital mode properties, a category of SPDIF settings may be configured by selecting
WindowPropertiesSPDIF Settings if SPDIF mode was selected in the initialization window.
Note: SPDIF will not be supported on new EVBs as of February 14, 2011. These properties will not be available through the GUI in conjunction with those boards.

Figure 42. SPDIF Settings Property Window

Table 12. SPDIF Settings Property Window Descriptions

Item

Description

Range

Misc.

SPDIF Invert Clock Select between using rising edge or falling edge of DCLK when sampling Digital Input (DIN) data.
SPDIF Output Format Select the SPDIF digital audio format between I2S or Left Justified.

On/Off Left-Justified or I2S

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5.9. FM Transmitter Receive Power Scan Window
The Receive Power Scan window enables the user to scan the entire FM band to find one or more candidate channels on which to transmit, where candidate channels are defined as those with the lowest received power.
Selecting WindowPower Scan will launch the Receive Power Scan Window as shown in Figure 43. The band
and channel spacing can be selected and the number of regions can be set to return one to ten candidate channels. The number of channels to average can be set to 1, 3, 5, or 7. Selecting “To Presets “will save the candidate channels to the GUI presets. Refer to “AN307: Si4712/13/20/21 Receive Power Scan” for additional information on the RPS feature and algorithm.

Figure 43. Receive Power Scan Window

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5.10. FM Transmitter Radio Data Service (RDS)
The RDS/RBDS feature is available with the Si4711/13/21. This user guide assumes that the user is already familiar with the RDS/RBDS standard. If necessary, the user may refer to the following documents to become familiar with the RDS/RBDS standard.
United States RBDS Standard by National Radio Systems Committee, April 9, 1998. RDS Universal Encoded Communication Protocol Version 5.1 by European Broadcasting Union, August
1997. Silicon Labs “AN243: Using RDS/RBDS with the Si4701/03.” In order for the user to transmit RDS, check the RDS On box. Failure to turn on RDS means that the RDS data will not be transmitted. The following picture illustrates the RDS On box that should be turned on.

Figure 44. Turning RDS On in the FM Transmitter Main Window
After the RDS transmission is enabled, click on WindowRDS Transmit Data to go to the RDS Transmit Data
screen. This window allows the user to configure RDS data to be transmitted and also allows the user to gain insight to the Si4711/13/21 RDS capability.

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Figure 45. RDS Transmit Window

Table 13. RDS Transmit Window Descriptions

Item

Description

General

RDS/RBDS Selection Program Type (PTY)
PTY Dynamic PI

Select either RDS format (Europe) or RBDS format (US). Select the available Program Type (PTY) from the pulldown menu. Select whether the PTY will be dynamic or static. Enter Program Identification (PI) code here.

Program Service

Program Service Messages Enter up to 12 different Program Service (PS) Messages. Each PS consists of a maximum 8 characters. Messages are ordered left to right, top to bottom.

Load Msgs

Load the PS messages into the device.

Repeat Count

Enter how many time each PS will be repeated before sending the next PS.

Message Count

Enter how many messages of the loaded PS that will be transmitted.

Mix

Select the mix percentage between transmitting the Program Service or Buffers.

Alternate Frequency Part of RDS Group Type 0 (PS): Enter Alternate Frequency if it is available.

Artificial Head

Part of RDS Group Type 0 (PS): Enter whether Artificial Head is On or Off.

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Table 13. RDS Transmit Window Descriptions

Item

Description

Stereo
Audio Compression Traffic Program
Traffic Announcement
Speech

Part of RDS Group Type 0 (PS): Enter whether the transmitted audio is Stereo or Mono.
Part of RDS Group Type 0 (PS): Enter whether the Audio Compression is On or Off.
Part of RDS Group Type 0 (PS): Enter whether Traffic Program is available or not.
Part of RDS Group Type 0 (PS): Enter whether Traffic Announcement is available or not.
Part of RDS Group Type 0 (PS): Enter between Speech or Music transmission.

Buffers

Radio Text

Enter the RDS Group Type 2 Radio Text (RT) messages that will be loaded into either the circular or FIFO buffer.

Radio Text: A/B Flag

Part of RDS Group Type 2 (RT): Enter whether the A/B Flag is set or not in entering the RT. This A/B Flag will tell the receiver to clear the display when the flag toggles from one state to the other.

Radio Text: Add to Circular Add the RT messages that are entered into the GUI circular buffer queue.

Radio Text: Add to FIFO Add the RT messages that are entered into the GUI FIFO buffer queue.

Manual Group Entry: B Enter manual RDS entry block B. With this window, you can transmit all RDS Group Types 0 through 15.

Manual Group Entry: C Enter manual RDS entry block C. With this window, you can transmit all RDS Group Types 0 through 15.

Manual Group Entry: D Enter manual RDS entry block D. With this window, you can transmit all RDS Group Types 0 through 15.

Manual Group Entry: Add to Add the RDS manual entry values into the GUI circular buffer queue. Circular

Manual Group Entry: Add to Add the RDS manual values into the GUI FIFO buffer queue. FIFO

Circular

Indicator showing the GUI circular buffer queue.

Circular: Size (Blocks)

Indicator showing the size (in blocks) of the circular buffer. The total size of the buffer is 128, which is shared between the circular and FIFO buffers. To adjust the size, change the size in the FIFO buffers.

Circular: Delete Group Delete the currently selected group in the GUI circular buffer queue.

Circular: Clear Buffer & Send Clear the circular buffer on the device and send the messages in the GUI circular buffer queue to the device.

FIFO

Indicator showing the GUI FIFO queue.

FIFO: Size (Blocks)

Indicator showing the size (in blocks) of the FIFO buffer. Adjusting the size of the FIFO will also adjust the size of the circular buffer. The total of those two buffers is 128 blocks.

FIFO: Add Time

This will get the current time and format it into RDS Group Type 4 Clock & Time (CT), and add it to the GUI FIFO buffer queue.

FIFO: Delete Group Delete currently selected group in the GUI FIFO buffer queue.

FIFO: Clear Buffer & Send Clear the FIFO buffer on the device and send the message in the GUI FIFO buffer queue to the device.

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There are 16 different group types in the RDS/RBDS standard, and for every group the following information is always transmitted:
1. Program Identification (PI) 2. Program Type (PTY) The GUI makes it easy to send data in three of the following group types: 1. Group Type 0: Program Service (PS) 2. Group Type 2: Radio Text (RT) 3. Group Type 4: Clock Time (CT) It is possible to send data in the other group types, but the user has to manually enter the data in hexadecimal code. Because of the complexity of the RDS/RBDS standard, the explanation of the RDS Transmit Data window is divided into three sections: Basic, Intermediate, and Advanced.

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5.10.1. Basic The RDS Transmit Window is divided into three categories:
1. General 2. Program Service 3. Buffers In the basic section, we will cover two out of the three categories: the General and Program Service. In the General category, the user can set the PI and PTY data. In the Program Service, the user can set the PS data (Group Type 0). The following diagram shows a step-by-step explanation:

3 4

1

2

5

Figure 46. Basic RDS Message Illustration
1. First select whether you want to transmit in RDS format (Europe) or RBDS format (US). 2. Type in the Program Identification in this field. Program Identification is a 16-bit code assigned to an
individual station. 3. Select the Program Type in the pull down menu here. Some examples include news, information, sports,
talk, rock, etc. 4. Enter the Program Service (PS) in the boxes provided. You can enter a maximum of 12 different PS
messages, in which each PS message can contain a maximum of 8 characters. a. Repeat Count: Enter how many times you want each PS message to be transmitted before sending the next PS message. b. Message Count: Enter how many of the 12 PS messages that you actually want to transmit. c. Mix: Select 100 percent.
5. Click Send Message button here. Now the RDS will transmit the PS message along with the PI and PTY. You should see these data in your RDS receiver.

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5.10.2. Intermediate In the intermediate section, we will cover the buffers category of sending the RDS data with the device, in particular we will send Group Type 2 (Radio Text) and Group Type 4 (Clock Time). The following diagram shows a step-by-step procedure to send the buffers data in addition to the General and Program Service data covered in the basic section.

1

2
3a 3
5
6 4

Figure 47. Intermediate RDS Message Illustration
1. Select the Mix percentage that you want between transmitting the data in Program Service and the data in the Buffers. A mix percentage of 100% means that you will always transmit the PS message regardless of what is contained in the Buffers, whereas a mix percentage of 0% means that you will always transmit the data in the Buffers regardless of what is contained in the PS. If the buffers are empty, the PS messages will be transmitted all the time regardless of the mix percentage.
2. Enter the Radio Text message that will be transmitted. After entering the RT message, click either the “Add to Circular” button or the “Add to FIFO” button. The RT message will be encoded according to the RDS Group Type 2 rule.
a. Clicking “Add to Circular” button means that you add the RT message into the GUI Circular Buffer queue. Note that the message itself has not been uploaded into the Circular Buffer inside the device until the Clear Buff & Send is clicked.
b. Clicking “Add to FIFO” means that you upload the RT message into the GUI FIFO Buffer queue. Note that the message itself has not been uploaded into the FIFO Buffer inside the device until the Clear Buff & Send is clicked.
3. Enter the size of the FIFO that you want here. The device buffer has a total of 128 blocks, which is shared by the circular buffer and the FIFO. Therefore, the circular buffer size (shown in 3a) will be the remainder of the 128 blocks minus the FIFO size.
4. Clicking this “Clear Buff & Send” button will upload the message from the GUI Circular Buffer queue into the Circular Buffer inside the device. The Circular Buffer on the part will repeatedly send the message contained in the buffer. Note that the messages in the circular buffer will be transmitted only if the PS Mix

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value is set to anything other than 100%. 5. Clicking the “Add Time” button here will add the current time as a RDS Group Type 4 message to the GUI
FIFO Buffer queue. 6. Clicking the “Clear Buff & Send” button will upload the message from the FIFO Buffer Indicator Window
into the FIFO Buffer inside the device. The FIFO Buffer on the part will only send the messages contained in the buffer once. A good example of using FIFO buffer is when you want to send the time data. Time is something that occurs only once, so it will not be beneficial to upload time to the circular buffer and transmit it continuously. Refer to step 5 for information on sending time data. Note that the messages in the FIFO buffer will be transmitted only if the PS Mix value is set to anything other than 100%. 5.10.3. Advanced In the advanced section, we will cover the remaining RDS topics.
1
2 3
4
5 8
6
7 9

Figure 48. Advanced RDS Sending Illustration
1. Dynamic: This tells whether the PTY code is static or dynamic. 2. Alternate Frequency: This provides the ability to inform the receiver of a single alternate frequency. This
field is transmitted along with the Group Type 0 (PS). 3. Miscellaneous bits in Group Type 0 (PS):
a. Artificial Head: 0 = Not Artificial Head; 1 = Artificial Head b. Stereo: 0 = Mono; 1 = Stereo c. Audio Compressor: 0 = Not compressed; 1 = Compressed d. Traffic Program (TP): 0 = No TP; 1 = TP e. Traffic Announcement (TA): 0 = No TA; 1 = TA f. Speech: 0 = Speech; 1= Music 4. A/B Flag: This is an important flag in the RDS Group Type 2 (RT). Checking this box when a Radio Text is

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uploaded means that the RT is uploaded with the flag set. Un-checking this box when an RT is uploaded means that the flag is not set. This flag tells the receiver that when the flag toggles from set to reset or vice versa, the receiver will clear the display before showing the next RT. 5. Manual Group Entry: Use this box to upload the RDS data manually. You can use this box to upload messages from the Group Type for which the GUI does not have encoding support. For these messages, the user must encode the messages into hexadecimal code. 6. Circular Buffer Indicator: This displays the message that gets uploaded into the Circular Buffer in hexadecimal code. This can be useful to see how the Group Type 0 (PS), Type 2 (RT), and Type 4 (CT) is encoded into RDS data. 7. Delete Circular Buffer Group: This deletes a group that is selected in the Circular Buffer Indicator. 8. FIFO Buffer Indicator: This displays the message that gets uploaded into the FIFO buffer in hexadecimal code. 9. Delete FIFO Buffer Group: This deletes a group that is selected in the FIFO Buffer Indicator.

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5.11. FM Transmitter Register Map Window
The register map window allows the user to manually program the device by sending commands to the chip. Refer
to “AN332: Si47xx Programming Guide” to manually program the device. Clicking on WindowRegister Map will
launch the Register Map Window as shown in Figure 49.

Figure 49. FM Transmitter Register Map Window

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FM Receiver GUI

The first Si47xx window is the Initialization window as shown in Figure 50. Select the FM receiver function. As an FM receiver, analog audio out is available on pins 13 and 14.
6.1. Configuring the Si47xx as an FM Receiver
Select the device, busmode, firmware revision, and initial part settings and then click Initialize. A new window displaying “Initializing FM Receiver” will appear. If you check “Use XOSCEN,” the daughtercard crystal and on-chip oscillator will be used to clock the Si47xx. Crystal operation is not supported on Si474x-EVB (that supports Si4740/ 41/42/43/44/45) and Si4749-EVB. You can use the EVB Audio Settings drop down box to select the audio mode used by the Si47xx part. See Section 2.1.4 of the Si47xx-EVB User’s Guide for more information on this setting. The Si4749 can also be programmed as an RDS only tuner. This selection is available through the EVB Audio Setting drop down box as well. Note: As of February 2011, SPDIF is not supported on new EVBs. Modes of operation requiring the SPDIF will not be available
in the initialization window for those boards.

Figure 50. FM Receiver Initialization

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6.2. FM Receiver Main Window
The FM receiver main window will appear after initialization.

11

2

5 4

3 6

Figure 51. FM Receiver Main Window

Figure 52. FM Receiver Main Window for Si474x

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Table 14. FM Receiver Main Window Descriptions

Name

Descriptions

1

Tune/Seek Tune Down (<), Tune Up (>) buttons execute a single channel step according to the

channel spacing setting. The channel spacing setting can be set in the property window.

Seek down (<<), Seek Up (>>) buttons execute a seek up or down to the next received FM signal meeting or exceeding the seek settings within the selected band. The seek setting Received Signal Strength Indicator (RSSI) and Signal to Noise Ratio (SNR) threshold can be set in the property window.

2

Freq Slider, The Frequency Display indicates the frequency in MHz. To change the Frequency, drag

AFC Rail Indicator, the pointer in the Frequency Slider Bar to the desired frequency. The frequency may also

Mono/Stereo be changed by changing the value in the display.

Indicator, Pilot Indicator, Stereo Blend
Indicator, Valid Indicator

AFC Rail indicator will be red if the tuned frequency is in an AFC rail state, otherwise the indicator will be grey.
The Mono/Stereo indicator will switch to stereo if the blend ratio is greater than 0 and the Pilot is present.

The Pilot indicator will be green if the received FM signal has a pilot signal.

The Stereo Blend indicator will be green if the part goes into linear blend between stereo and mono. Full mono is indicated by 0% and full stereo is indicated by 100%.

The Valid indicator will be green if the FM frequency meets the RSSI and SNR seek settings in the property window.

3 Volume, Mute Select the Si47xx output volume (0-63) by moving the slider bar pointer. Press the Mute button to mute the Si47xx radio. If the radio is muted, the button will be red. Press the Mute button again to remove the muting.

4

Auto Scan, The Auto Scan button will find all the stations with an RSSI and SNR above the seek

To Preset,

settings in the property window. After the scan is completed, the number of stations

Select Stn

found will be displayed and each station will be available in the drop down box. Also, a

red indicator mark will be displayed on the Frequency Slider Bar (2) for each station. The

“To Presets” Button will program the preset buttons (5) with the 12 strongest stations.

5

Presets

Press the desired button to tune to the frequency displayed on the button. To store a new

value to the preset button, tune to the desired frequency and then press and hold the

desired button for 1.5 seconds. The button will then change to indicate the stored

frequency.

6

RSSI/SNR/ The RSSI indicator displays the RSSI of the signal in dBuV.

Multipath/Stereo/HiCut/SoftMute

The

SNR

indicator

displays

the

SNR

of

the

received

signal

in

dB.

The Multipath indicator will be green if Multipath is detected. This indicator is only

available in Si474x products. Refer to Figure 60.

The Stereo Blend indicator will be green if the part goes into linear blend between stereo and mono. Full mono is indicated by 0% and full stereo is indicated by 100%.

The Hi-Cut indicator will indicate the percentage of hi-cut being applied to the audio signal. This indicator is only available in Si4742/43/44/45 products. Refer to Figure 60.

The Soft Mute indicator will indicate the amount of attenuation in dB applied to the audio signal.

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6.3. FM Receiver Settings Property Window FM receiver settings can be configured through the properties window by selecting WindowProperties.
Properties are grouped into categories which can be selected from the drop- down box in the upper right of the
window. For convenience, all FM receiver properties are also located in WindowPropertiesFM: All.

Figure 53. FM Receiver Settings Property Window

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Figure 54. FM Receiver Setting Property Window for Si474x (1 of 2)

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Figure 55. FM Receiver Setting Property Window for Si474x continued (2 of 2)

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Table 15. FM Receiver Settings Property Window Descriptions

Items

Description

AGC Attack Rate Larger values provide slower attack and smaller values provide faster attack.

AGC Index

If AGC override is set to “ON,” this property will determine the AGC setting.

AGC Override

If set to “ON,” the AGC property will be used to set the value of the AGC. If set to “OFF,” the AGC setting will be automatically determined by the part.

AGC Release Rate Larger values provide slower release and smaller values provide faster release.

De-emphasis Selects de-emphasis of 50 µs or 75 µs.

Reference Clock Frequency (Hz)

This field is used to specify the frequency of the reference clock. The input to the RCLK pin divided by the prescaler is the reference clock. The reference clock must be in the range of 31130 to 34406 Hz.

Reference Clock Prescaler

This field is used to specify the prescaler value. The input to the RCLK pin divided by the prescaler is the reference clock. The reference clock must be in the range of 31130 to 34406 Hz.

Digital DCLK Falling ON uses falling edge of DCLK for sampling. Edge

Range 4­248 0­26 ON/OFF
4­248 50 µs, 75 µs
31130­ 34406 Hz
1­4095 Hz
ON, OFF

Digital Format Format of digital audio output.

I2S, Left-Justified, DSP

Digital Mono Mode ON enables mono in digital audio output. Enable

ON, OFF

Applicable Devices Si474x
All
All
Si474x
All except Si4749 All
All
Si4705/06, Si4721/31/35/37/39, Si4730/34/36/38-D60 and
later, Si4741/43/45,
Si4784/85 Si4705/06, Si4721/31/35/37/39, Si4730/34/36/38-D60 and
later, Si4741/43/45,
Si4784/85 Si4705/06, Si4721/31/35/37/39, Si4730/34/36/38-D60 and
later, Si4741/43/45,
Si4784/85

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Table 15. FM Receiver Settings Property Window Descriptions (Continued)

Items

Description

Range

Applicable Devices

Digital Sample Digital audio output bit precision. Precision

8-bit, 16-bit, 20bit, 24-bit

Si4705/06, Si4721/31/35/37/39, Si4730/34/36/38-D60 and
later, Si4741/43/45,
Si4784/85

Digital Sample Rate DFS sample rate for digital input signal.

Hz

Recommended values are: 32 kHz,

44.1 kHz, or 48 kHz. Over-sampling rate

must be set in order to satisfy a minimum

DCLK of 1 MHz. Sample rate must be set to

0 before DCLK/DFS is removed.

0, 32000­ 48000 Hz

Si4705/06, Si4721/31/35/37/39, Si4730/34/36/38-D60 and
later, Si4741/43/45,
Si4784/85

Hi-Cut Attack Rate Set the rate at which hi-cut lowers the cutoff frequency. If set to 0, hi-cut attack is disabled.

0 – 32767

Si4740/41/42/43/44/45, Si4704/05-D50 and later,
Si4706-C30 and later, Si4730/31/34/35/84/85-D50
and later

Hi-Cut Cutoff Max Sets the maximum audio transition

Frequency

frequency bandwidth.

Disabled, 2, 3, 4, Si4740/41/42/43/44/45,

5, 6, 8, and Si4704/05-D50 and later,

11 kHz

Si4706-C30 and later,

Si4730/31/34/35/84/85-D50

and later

Hi-Cut Cutoff Min Sets the minimum band limit transition

Frequency

frequency for hi-cut.

Disabled, 2, 3, 4, Si4740/41/42/43/44/45,

5, 6, 8, and Si4704/05-D50 and later,

11 kHz

Si4706-C30 and later,

Si4730/31/34/35/84/85-D50

and later

Hi-Cut Multipath End Sets the multipath level at which hi-cut

Threshold

reaches maximum limit.

0 -100

Si4740/41/42/43/44/45, Si4704/05-D50 and later,
Si4706-C30 and later, Si4730/31/34/35/84/85-D50
and later

Hi-Cut Multipath Sets the multipath level at which hi-cut Trigger Threshold begins to band limit.

0 -100

Si4740/41/42/43/44/45, Si4704/05-D50 and later,
Si4706-C30 and later, Si4730/31/34/35/84/85-D50
and later

Hi-Cut Release Rate Set the rate at which hi-cut increases the cutoff frequency. If set to 0, hi-cut release is disabled.

0 – 32767

Si4740/41/42/43/44/45, Si4704/05-D50 and later,
Si4706-C30 and later, Si4730/31/34/35/84/85-D50
and later

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Table 15. FM Receiver Settings Property Window Descriptions (Continued)

Items

Description

Range

Applicable Devices

Hi-Cut SNR High Sets the SNR level at which hi-cut begins to

Threshold

band limit.

0 ­ 127 dB

Si4740/41/42/43/44/45, Si4704/05-D50 and later,
Si4706-C30 and later, Si4730/31/34/35/84/85-D50
and later

Hi-Cut SNR Low Sets the SNR level at which hi-cut reaches

Threshold

maximum band limit.

0­127 dB

Si4740/41/42/43/44/45, Si4704/05-D50 and later,
Si4706-C30 and later, Si4730/31/34/35/84/85-D50
and later

Noise Blanker Delay Delay in microseconds before applying noise blanking to the original samples.

125­219 µs

Si4742/43/44/45

Noise Blanker Sets the threshold for detecting impulses in Detect Threshold dB above the noise floor. If set to 0, impulse
noise blanking is disabled.

0 ­ 90 dB

Si4742/43/44/45

Noise Blanker IIR Sets the cut-off frequency for the low pass

Filter

filter that is used for noise floor estimation in

noise blanker detection.

300­1600

Si4742/43/44/45

Noise Blanker Interval

Interval original samples are replaced by interpolated clean samples.

8 ­ 48 µs

Si4742/43/44/45

Noise Blanker Rate Maximum noise blanking rate.

100 ­ 6400 Hz

Si4742/43/44/45

Antenna Type Receive antenna selection.

Headphone or Si4704/05/06/20/21 only short antenna

Channel Filter

Selects the channel filter to be used before demodulation.

Automatic, Si4706, Si4749, Si4704/05/

110 kHz, 84 kHz, 30/31/34/35/84/85-D50 and

60 kHz, and

later

40 kHz

Band

Frequency band

US/Europe:

All

87.5­108 MHz

Japan: 76­

90 MHz

Japan Wide: 76­

108 MHz

Seek Band Bottom The lower frequency limit for the seek

US/Europe:

All

(MHz)

function. This is set automatically by the

87.5 MHz

GUI based on band and spacing selection. Japan: 76 MHz

Japan Wide:

76 MHz

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Table 15. FM Receiver Settings Property Window Descriptions (Continued)

Items Seek Band Top
(MHz)
Max Tune Error (kHz)
Seek Mode
Seek RSSI Threshold (dBuV)
Seek SNR Threshold (dB)
Spacing
Soft Mute Attack Rate (dB/s)
Soft Mute Attenuation Slope
(dB/dB)
Soft Mute Max Attenuation (dB)
Soft Mute Release Rate (dB/s)
Soft Mute SNR Threshold (dB) Soft Mute Rate

Description The upper frequency limit for the seek function. This is set automatically by the GUI based on band and spacing selection.
Selects the maximum tuning frequency error before the AFC rail indicator is set. Select between stopping the seek at the band limits or wrapping at the band limits to return to the starting frequency. The seek RSSI threshold level used for seek and scan functions. The seek SNR threshold level used for seek and scan functions. Channel spacing
Sets the attack rate for entering soft mute.
Soft mute attenuation slope specifies the slope of the attenuation curve when the signal SNR is below the soft mute SNR threshold. It is specified as dB/dB where the attenuation applied is simply the value specified here times the amount the signal SNR is below the threshold. Maximum attenuation for soft mute.
Sets the release rate for leaving soft mute.
SNR threshold level used to engage soft mute. Selects the soft mute rate.

Range
US: 107.9 MHz (200 kHz spacing) Europe: 108 MHz (100 kHz spacing)
Japan: 90 MHz Japan Wide: 108 MHz
0­255 kHz

Applicable Devices All
All

Stop at limit or

All

wrap at limit

0­255 dB

All

0­255 dB

All

50, 100, or 200 kHz
1­31999 dB/s
1­63

All
Si4706-C30 and later, Si4740/41/42/43/44/45, Si4704/05/30/31/34/35/84/
85-D50 and later Si4704/05/06/3x-C40 and later, Si4740/41/42/43/44/45

0­31 dB, 0 = disable soft
mute 1­31999 dB/s
0­15 dB

All except Si4749
Si4706-C30 and later, Si4740/41/42/43/44/45, Si4704/05/30/31/34/35/84/
85-D50 and later All except Si4749

1­255 dB

Si4706/07/20/21/84/85-B20 and earlier,
Si4704/05/30/31/34/35-C40 and earlier

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Table 15. FM Receiver Settings Property Window Descriptions (Continued)

Items
Blend Multipath Attack Rate

Description
Attack rate associated with multipath when adjusting blend. If set to 0, attack would be disabled.

Blend Multipath Multipath input level above which the tuner Mono Threshold blends into full mono.

Blend Multipath Release Rate

Release rate associated with multipath when adjusting blend. If set to 0, release would be disabled.

Blend Multipath Multipath input level below which the tuner Stereo Threshold blends into full stereo.

Blend RSSI Attack Attack rate associated with RSSI when

Rate

adjusting blend. If set to 0, attack would be

disabled.

Blend RSSI Mono RSSI level below which the tuner blends Threshold (dB) into full mono.

Blend RSSI Release Release rate associated with RSSI when

Rate

adjusting blend. If set to 0, release would be

disabled.

Blend RSSI Stereo RSSI level above which the tuner blends Threshold (dB) into full stereo.

Blend SNR Attack Attack rate associated with SNR when

Rate

adjusting blend. If set to 0, attack would be

disabled.

Blend SNR Mono SNR level below which the tuner blends into Threshold (dB) full mono.

Range 0­32767
0­100 0­32767
0­100 0­32767 0­127 dB 0­32767 0­127 dB 0­32767 0­127 dB

Applicable Devices
Si4740/41/42/43/44/45, Si4704/05-D50 and later,
Si4706-C30 and later, Si4730/31/34/35/84/85-D50
and later
Si4740/41/42/43/44/45, Si4704/05-D50 and later,
Si4706-C30 and later, Si4730/31/34/35/84/85-D50
and later
Si4740/41/42/43/44/45, Si4704/05-D50 and later,
Si4706-C30 and later, Si4730/31/34/35/84/85-D50
and later
Si4740/41/42/43/44/45, Si4704/05-D50 and later,
Si4706-C30 and later, Si4730/31/34/35/84/85-D50
and later
Si4706-C30 and later, Si4740/41/42/43/44/45, Si4704/05/30/31/34/35/84/
85-D50 and later
Si4706-C30 and later, Si4740/41/42/43/44/45, Si4704/05/30/31/34/35/84/
85-D50 and later
Si4706-C30 and later, Si4740/41/42/43/44/45, Si4704/05/30/31/34/35/84/
85-D50 and later
Si4706-C30 and later, Si4740/41/42/43/44/45, Si4704/05/30/31/34/35/84/
85-D50 and later
Si4740/41/42/43/44/45, Si4704/05-D50 and later,
Si4706-C30 and later , Si4730/31/34/35/84/85-D50
and later
Si4740/41/42/43/44/45, Si4704/05-D50 and later,
Si4706-C30 and later , Si4730/31/34/35/84/85-D50
and later

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Table 15. FM Receiver Settings Property Window Descriptions (Continued)

Items

Description

Blend SNR Release Release rate associated with SNR when

Rate

adjusting blend. If set to 0, release would be

disabled.

Blend SNR Stereo SNR level above which the tuner blends Threshold (dB) into full stereo.

Stereo Blend Mono RSSI threshold below which the tuner Threshold (dB) blends into full mono.
Stereo Blend Stereo RSSI threshold above which the tuner Threshold (dB) blends into full stereo.

Range 0­32767
0­127 dB
0­127 dB 0­127 dB

Applicable Devices
Si4740/41/42/43/44/45, Si4704/05-D50 and later,
Si4706-C30 and later , Si4730/31/34/35/84/85-D50
and later
Si4740/41/42/43/44/45, Si4704/05-D50 and later,
Si4706-C30 and later , Si4730/31/34/35/84/85-D50
and later
Si4704/05/1x/2x/3x-C40 or earlier, and Si4706-B20
Si4704/05/1x/2x/3x-C40 or earlier and Si4706-B20

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6.4. CODEC and SPDIF Settings
Si47xx-EVB baseboard has a Codec and an SPDIF translator for digital audio output. For tuners with digital audio option, you can set properties for the Codec and SPDIF through the GUI. These settings can be used with AM or FM tuners that have digital audio enabled.
Select WindowPropertiesCODEC and SPDIF Settings.
Note: SPDIF will not be supported on new EVBs as of February 14, 2011. SPDIF properties will not be available through the
GUI in conjunction with those boards. CODEC properties will be available through WindowPropertiesCODEC
Settings.

Figure 56. CODEC and SPDIF Settings Window

Table 16. CODEC and SPDIF Settings Windows Descriptions

Items
Codec Precision Codec Output Format
Codec Sampling Rate Codec Channel Swap
Codec Invert Clock SPDIF Output Format
SPDIF Invert Clock

Description

Range

Misc.

Precision of the CODEC on baseboard in bits. Format of audio output through the Codec.

16-bit, 20-bit, 24-bit
I2S, Left-Justified, DSP(MSB on 1st DCLK), DSP(MSB on
2nd DCLK)

Sampling rate for the Codec in kHz.

32 kHz, 48 kHz

Determines if channels need to be swapped on the Codec.

ON, OFF

ON inverts the digital clock. Format of audio output through the SPDIF.

ON, OFF I2S, Left-Justified

ON inverts the digital clock.

ON, OFF

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6.5. FM Receiver RDS Window
The FM receive RDS window allows the user to view program service, program type, PI code, radio text, enhanced radio text, radio text plus, clock, group error rate, sync time and display times, an alternate frequency list, and
group statistics. Select WindowRDS Receive Data. Click on Radio Text Plus (RT+) to get the RT+ class and item
information.

1

2

4

6

3

7 5

8

Figure 57. FM Receiver Settings RDS Window

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Table 17. FM Receiver Settings RDS Window Descriptions

Items

Description

1 Radio Data Service PS: Program Service Indicator (8 characters).

RT: Radio Text Indicator (64 characters).

eRT: Enhanced Radio Text Indicator

CT: Clock Indicator showing time, day, and date.

Group Error Rate indicates the percentage of uncorrectable groups received.

PTY: Program Type Indicator

PI: PI Code Indicator

2

Sync Times Time required to synchronize, display radio text, and display program service.

3

RDS

Indicates that RDS is synchronized.

Synchronization

Indicator

4

Alternate

When present, shows a list of alternate frequencies. Alternate frequency methods A and

Frequency B are supported.

Indicator

5 Group Counters Provides the total number and percentage breakdown of group types 0­15, A/B. To view
this information, select WindowRDS Group Counters. Please refer to Figure 58.

6 Block Counters Provides the block error rates after tune and after RDS Sync. After Tune Error Rate: After tune (STC interrupt), the ideal number of blocks the FM tuner should have received is calculated. Also, the number of accepted blocks and errors are calculated. Error Rate = number of errors / number of ideal blocks after tune. After Sync Error Rate: After RDS Sync (RDS interrupt), the ideal number of blocks the FM tuner should have received is calculated. Also, the number of accepted blocks and errors are calculated. Error Rate = number of errors / number of ideal blocks after sync Because it usually takes 100~200ms for the FM tuner to synchronize to RDS data (STC interrupt always comes before RDS interrupt), “After Tune Error Rate” will always be greater than “After Sync Error Rate.” After a long time, both error rates should consolidate at similar levels.

7

Reset

Resets the block counter numbers.

8 Radio Text Plus Radio Text Plus (RT+) Class and Item Information Indicator

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Figure 58. RDS Group Counters Window

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6.6. FM Receiver RDS Settings RDS settings are configured by selecting WindowPropertiesFM Receiver RDS Settings.

Figure 59. FM Receiver RDS Settings Window

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Table 18. FM Receiver RDS Settings Window Descriptions

Item

Description

Range

Misc.

RDS State RDS Error Checking (RT and PS)
RDS Program Type Decode RDS Text Decoding* RDS Group Filter Mode
RDS Block A Error Level RDS Block B Error Level RDS Block C Error Level RDS Block D Error Level

Enables and disables RDS.

On, Off

Selects GUI error checking level. Minimum displays text as received. Mid-range requires two duplicate buffers before displaying text. Maximum requires two duplicate buffers and also ignores the A/B flag.

Minimum, Mid-Range, Maximum

Selects RDS or RBDS program type RDS, RBDS decoding.

Selects text decoding mode.

ASCII, Big 5 (Traditional Chinese), Default (Use system code page), UTF-8, Unicode

Selects group filter mode. Simple Simple, Verbose (Group B Corrected

mode displays a group as long as all Only), Verbose (Group B

blocks are correctable. Verbose

Uncorrected), Strict

(Group B Uncorrected) mode

displays a group even if one or more

blocks is uncorrectable. Verbose

(Group B Corrected) displays a

group as long as block B is

correctable, even if blocks A, C, or D

are uncorrectable. Strict mode

displays a group only if there are no

errors in any block.

Sets the Block A error level above which the entire RDS group will be discarded.

No Block Errors 1 to 2 errors corrected 3 to 5 errors corrected Uncorrectable

Sets the Block B error level above which the entire RDS group will be discarded.

No Block Errors 1 to 2 errors corrected 3 to 5 errors corrected Uncorrectable

Sets the Block C error level above which the entire RDS group will be discarded.

No Block Errors 1 to 2 errors corrected 3 to 5 errors corrected Uncorrectable

Sets the Block D error level above which the entire RDS group will be discarded.

No Block Errors 1 to 2 errors corrected 3 to 5 errors corrected Uncorrectable

*Note: The RDS character libraries are documented in Annex E of CENELEC EN 50067: 1998.

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Si47xx-EVB

Figure 60. FM UI Settings Property Window

Table 19. FM UI Settings Property Window Descriptions

Hems
Update Rate (sec) Scan Time 1 (sec) Scan Time 2 (sec)

Description
Misc.
The time span when the UI gets status information from the part.
In log band scan, the time between seeking and retrieving data from the UI.
In log band scan, the time it takes the RDS data to populate, if RDS is available.

Range
0.2­4.0 seconds 1­10 seconds 1­10 seconds

Note: UI settings window is common to all EVBs.

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6.8. FM Receiver RSSI/SNR Graph Window
The RSSI/SNR Graph Window allows the user to plot RSSI and SNR across the FM band. Bitmap data can be
saved to file by selecting FileSave as Bitmap and tabulated data can be saved to file by selecting FileSave to
.csv.

1

3 2
4
5

6

Figure 61. FM Receiver RSSI/SNR Graph Window

Table 20. FM Receiver RSSI/SNR Graph Window Descriptions

Items

Description

1

RSSI/SNR Graph

Select between drawing the RSSI, SNR graph, or both.

2

Line / Bar

Select between drawing in bar mode (depicted as green) or in continuous

line mode (depicted as yellow).

3

Draw

Click this to start plotting the graph.

4

Seek Threshold

Draw the RSSI and/or SNR seek threshold as specified in the respective

(RSSI/SNR)

properties. The RSSI seek threshold is shown in red, the SNR seek

threshold is shown in orange.

5

Valid Stations

Mark valid stations based on the RSSI/SNR seek threshold settings. Valid

frequencies can also be marked.

6

Clear

Click this button to clear the traces selected in the Delete Plots combo box.

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6.9. FM Receiver Register Map Window
The register map window allows the user to manually program the device by sending commands to the device. Refer to “AN332: Si47xx Programming Guide” to manually program the device.

Figure 62. FM Receiver Register Map Window

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6.10. FM Receiver Logging Tools
The GUI provides several useful logging tools. In the tools menu, user can choose to log raw RDS data, band scan data, device commands and channel info.

Figure 63. Logging Tools
6.10.1. Log Band Scan
Selecting ToolsLog Band Scan allows you to specify a filename and begin a scan of the entire band for RDS
data, RDS acquisition times, and the contents of each register. The scan feature starts with the first frequency in the band (CHAN = 0) and then seeks to the first station that meets the seek criteria (SEEKTH, SKCNT, SKSNR).
When a valid station is found, the software waits at the station for the time specified by ViewSession PreferencesScan Log After Tune Delay (sec) and then checks if RDS is available. If RDS is not available, the
software logs the register settings and seeks to the next valid station. If RDS is available, the software waits an
additional delay as specified by ViewSession PreferencesScan Log RDS Log Delay (sec). When this delay
expires, the software logs the RDS information and register settings and seeks to the next valid station. While scanning, the software displays a green “Scanning” notice below the menu bar. The scan can be aborted by
selecting the ToolsLog Band Scan a second time. When the scan completes, the filename given is saved in
comma separated format and is available for analysis in a text editor or spreadsheet.
6.10.2. Log Raw RDS Data
Selecting ToolsLog Raw RDS Data prompts for a filename in which all RDS data will be logged in comma
separated format. The software then logs all raw RDS data that is received, the station it is received on, and the
time at which it was received. The logging will continue until ToolsLog Raw RDS Data is selected a second time
at which point the file is saved and available for analysis in a text editor or spreadsheet.
6.10.3. Log Channel Info
Selecting ToolsLog Channel Info prompts for a filename in which all register values will be logged in comma
separated format. The software then logs all register values and the time at which it was received. The logging will
continue until ToolsLog Channel Info is selected a second time, at which point the file is saved and available for
analysis in a text editor or spreadsheet.
6.10.4. Log Device Commands
Selecting ToolsLog Device Commands prompts for a filename in which all software API calls and data with timestamp data will be logged as text. The logging will continue until ToolsLog Device Commands is selected a
second time, at which point the file is saved and available for analysis in a text editor.

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6.11. FM Receiver Configuration Helper
The configuration helper is a useful tool for configuring the thresholds related to RSSI based Blend, SNR based Blend, Multipath based blend, SNR based hi-cut, Multipath based hi-cut, and Soft Mute.

Figure 64. FM Configuration Helper
1

3 4

2 5

6
Figure 65. FM Configuration Helper Window (Multipath Based Hi-cut)

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Table 21. Configuration Helper Window Descriptions

Item

Description

1 Select Parameter

Selects between Hi-cut Multipath (Si4706/4x only), Hi-cut SNR(Si4706/ 4x only), SoftMute, Stereo blend Multipath (Si4706/4x only), Stereo Blend RSSI and Stereo Blend SNR (Si4706/4x only).

2 Hi-cut/ Blend/Soft Mute Graph

The plot displays the device threshold and rate settings, current signal conditions, and the calculated audio conditioning.

3 Plot Legend

The plot legend includes numeric values for current signal conditions and calculated audio conditioning.

4 Configuration Values

Configure threshold and rate properties. These values are at all times synchronized with the values available through the Properties window.

5 Selected Parameter Description Read a detailed description of the currently selected parameter in the Configuration Values group.

6 Close

Click this button to close the Configuration Helper window.

In the example shown in Figure 65, the current level marker shows that Hi-cut filter is set at 6 kHz. This is determined by both SNR and multipath conditions. Current SNR is 5 dB. Hi-cut SNR Low Threshold is set at 15 dB and hi-cut minimum frequency is set at 6 kHz. SNR is the determining factor in this case as it is already lower than the low threshold. Graph shows the current state of SNR (white diamond) and multipath (green diamond) and plots for each of them that show the transition between high and low thresholds and how the hi-cut filter frequency would be adjusted accordingly. You can adjust the configuration values to see how these plots and the current state of hicut would change.

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Figure 66. FM Configuration Helper Window (SNR Based Hi-cut)
In the example shown in Figure 66, the current level marker shows that hi-cut filter is set at 6 kHz. This is determined by both SNR and multipath conditions. Current SNR is 5 dB. Hi-cut SNR Low Threshold is set at 15 dB and hi-cut minimum frequency is set at 6 kHz. SNR is the determining factor in this case as it is already lower than the low threshold. The graph shows the current state of SNR (green diamond) and multipath (white diamond) and plots for each of them that show the transition between high and low thresholds and how the hi-cut filter frequency would be adjusted accordingly. You can adjust the configuration values to see how these plots and the current state of hi- cut would change.

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Figure 67. FM Configuration Helper Window (Softmute)
In the example shown in Figure 67, the current level marker shows that Soft Mute level is 0 dB. SNR threshold is programmed as 4 dB and max attenuation is 16 dB. Since the SNR reported by the part is 5 dB, which is above the threshold, the softmute level is 0 dB. The graph shows the current state of SNR (green diamond) and plot shows the softmute profile based on max attenuation, threshold and slope settings. You can adjust the configuration values to see how the plot and the current state of softmute would change.

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Figure 68. FM Configuration Helper Window (SNR Based Blend)
In the example shown in Figure 68, the Current Level marker shows that Stereo % is 56%. SNR threshold is programmed as 14 dB (and below) for full mono and 30 dB (and above) for full stereo. Since the SNR reported by the part is in between the thresholds, the stereo level is 56%. RSSI and Multipath do not factor in here as they are both at levels that would set the part in full stereo. The graph shows the current state of SNR (green diamond), RSSI (white diamond), and multipath (yellow diamond) and plots for each of them that show the transition between high and low thresholds and how the blend would be adjusted accordingly. You can adjust the configuration values to see how these plots and the current state of blend would change.

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Figure 69. FM Configuration Helper Window (RSSI Based Blend)
In the example shown in Figure 69, the Current Level marker shows that Stereo % is 56%. RSSI threshold is programmed as 30 dBµV (and below) for full mono and 49 dBµV (and above) for full stereo. RSSI reported by the part is in between the thresholds however the final blend percentage is determined by SNR and the stereo level is 56%. Multipath does not factor in here as it is at a level that would set the part in full stereo. The graph shows the current state of RSSI(green diamond), SNR (white diamond), and multipath (yellow diamond) and plots for each of them that show the transition between high and low thresholds and how the blend would be adjusted accordingly. You can adjust the configuration values to see how these plots and the current state of blend would change.

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In the example shown in Figure 70, the Current Level marker shows that Stereo % is 50%. Multipath threshold is programmed as: 60% (and above) for full mono and 20% (and below) for full stereo. Multipath reported by the part is 11% which would put the part in full stereo. However the final blend percentage is determined by SNR and the stereo level is 56%. The graph shows the current state of Multipath(green diamond), RSSI (white diamond) and SNR (yellow diamond) and plots for each of them that show the transition between high and low thresholds and how the blend would be adjusted accordingly. You can adjust the configuration values to see how these plots and the current state of blend would change.

Figure 70. FM Configuration Helper Window (Multi-path Based Hi-blend)

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Weather Band GUI

7.1. WB Receiver Initialization
The first Si47xx window is the Initialization window as shown in Figure 71. On the function menu, select and highlight the function of the Si47xx as a WB Receiver. Select the Boot Mode, Audio Mode, Firmware, Bus Mode, and initial part settings and then click Initialize. A new window displaying “Initializing WB Receiver” will appear. If you check “Use XOSCEN,” the daughter card crystal and on-chip oscillator will be used to clock the Si47xx. You can also select “(Analog Mode) to Analog Output”, “(Digital Mode) to SPDIF and CODEC (Analog Output)”, or “(Analog & Digital Mode) to Analog Output and SPDIF” with the Audio Mode drop down menu. Note: SPDIF will not be supported on new EVBs as of February 14, 2011. Modes of operation requiring the SPDIF will not be
available in the initialization window for those boards.
Figure 71. Weather Band Receiver Initialization

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7.2. Weather Band Main Window
The weather band main window will appear after initialization.

2 1

4

7

6

8

Si47xx-EVB

3

5

Figure 72. Weather Band Receiver Main Window

Table 22. Weather Band Receiver Main Window Descriptions

Name

Description

1

Tune/Seek

Tune Down (<), Tune Up (>) buttons execute a signal channel step (25 kHz step). Seek function is not available in the WB Receiver mode.

The Frequency Display indicates the frequency in MHz. To change the frequency,

2

Frequency Slider Bar, AFC Valid, Alert Tone

drag the pointer in the Frequency Slider Bar to the desired frequency. AFC Rail indicator will be red if the tuned frequency is in an AFC rail state; otherwise the indicator will be grey

The Alert Tone indicator will be green if the 1050 Hz Alert Tone is detected.

Select the Si473x output volume (0-63) by moving the slider bar pointer. Press the

3

Volume, Mute

Mute button on the mute radio. The button will be red if the radio is muted. Press

the Mute button again to remove the muting.

4

Auto Scan, To Preset, Select Stn

Auto Scan, To Preset, Select Stn functions are not available in the WB Receiver mode.

The RSSI indicator displays the RSSI of the signal in dBuV. The SNR indicator

5

Status

displays the SNR of the received signal in dB. The varactor is not available in the

WB Receiver mode.

Press the desired button to tune to the frequency displayed on the button. To store

a new value to the preset button, tune to the desired frequency and then press

6

Preset

and hold the desired button for 1.5 seconds. The button will then change to

indicate the stored frequency. This information is stored to a file and used the next

time the program is run.

7

Function

The Function buttons are used to boot up the device in a different mode.

8

SAME Event Information

The SAME Event Information displays the SAME Event Information. Use the up/ down arrow key to view different events. (Si4707 only)

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7.3. Weather Band Settings Property Window WB receiver settings can be configured through the properties window by selecting WindowProperties.
Properties are grouped into categories which can be selected from the drop- down box in the upper right of the
window. For convenience, all WB receiver properties are also located in WindowPropertiesWB: All.

Figure 73. Weather Band Receiver Settings Property Window

Table 23. Weather Band Receiver Settings Property Window

Item

Description

Range

Applicable Devices

Clock Configuration Properties

All

Reference Clock This field is used to specify the frequency of the ref- 31130­34406 Hz

All

Frequency (Hz)

erence clock. The input to the RCLK pin divided by

the prescaler is the reference clock. The reference

clock must be in the range of 31130 to 34406 Hz.

Reference Clock Pres- This field is used to specify the prescaler value. The 1­4095 Hz

All

caler

input to the RCLK pin divided by the prescaler is the

reference clock. The reference clock must be in the

range of 31130 to 34406 Hz.

Digital Format

Digital Output Properties Format of digital audio output.

All

I2S, Left-Justified,

All

DSP

Digital Sample Precision Digital audio output bit precision.

8-bit, 16-bit, Si4743/47/49 20-bit, 24-bit

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Table 23. Weather Band Receiver Settings Property Window (Continued)

Item

Description

Digital Sample Rate Hz

DFS sample rate for digital input signal. Recommended values are: 32 kHz, 44.1 kHz, or 48 kHz. Over-sampling rate must be set in order to satisfy a minimum DCLK of 1MHz. Sample rate must be set to 0 before DCLK/DFS is removed.

Digital Mono Mode ON enables mono in digital audio output. Enable

Digital DCLK Falling Edge ON uses falling edge of DCLK for sampling.

Seek/Tune Properties

Max Time Error (kHz) If a station is offset from the set frequency by this amount or more, the AFC rail bit is set.

Range 0, 32000­ 48000 Hz
ON, OFF ON, OFF 1­15 kHz

Applicable Devices All
All All All All

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7.4. Weather Band Receiver RSSI/SNR Graph Window
The RSSI/SNR Graph Window allows the user to plot RSSI and SNR across the weather band. Bitmap data can be
saved to file by selecting FileSave as Bitmap and tabulated data can be saved to file by selecting FileSave to
.csv.

1 2
3

4

Figure 74. Weather Band Receiver RSSI/SNR Graph Window

Table 24. Weather Band Receiver RSSI/SNR Graph Window Descriptions

Items

Description

1

RSSI/SNR Graph Select between drawing the RSSI, SNR graph, or both.

2

Line/Bar

Select between drawing in bar mode or in continuous line mode.

3

Draw

Click this to start plotting the graph.

4

Clear

Click this button to clear the entire graph.

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7.5. Weather Band Receiver Register Map Window
The register map window allows the user to manually program the device by sending commands to the device. Refer to “AN332: Si47xx Programming Guide” to manually program the device.

Figure 75. Weather Band Receiver Register Map Window

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7.6. Weather Band Receiver SAME Event Data (Si4707 only)
The SAME Event Data window allows the user to view the SAME message description, originator ID, originator type, purge time, origination time, region along with the raw data and event confidence. The Event to be displayed can be selected through the “Event” drop down box. The message buffer can be cleared by clicking on the “Clear Messages” button. The confidence metric for each byte is listed as a number from 0 to 3 with 3 representing the highest confidence level. The “Incoming Message” indicator is lit for a new incoming message.
Raw data, confidence metrics, time stamp and status flags may be logged to file by selecting ToolsLog Raw
SAME Data.
Figure 76. Weather Band Receiver SAME Event Data

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AM Receiver GUI

8.1. AM Receiver Initialization
The first Si474x window is the Initialization window as shown in Figure 77. On the function drop-down menu, select the function of the Si474x as an AM Receiver. Select the device, busmode, firmware revision, and initial part settings and then click Initialize. A new window displaying “Initializing AM Receiver” will appear. Crystal operation is not supported on Si474x-EVB (that supports Si4740/41/42/43/44/45). You can also select Analog Output or Digital Output through SPDIF and CODEC with the EVB Audio Settings drop down box. The AM receiver mode is used for LW reception as well.

Figure 77. AM Receiver Initialization

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8.2. AM Receiver Main Window
The AM receiver main window will appear after initialization.

Figure 78. AM Receiver Window

Table 25. AM Receiver Window Descriptions

Name

Description

1 Tune/Seek Tune Down (<), Tune Up (>) buttons execute a single channel step according to the channel spacing setting. The channel spacing setting can be set in the property window. Seek down (<<), Seek Up (>>) buttons execute a seek up or down to the next received FM signal meeting or exceeding the seek settings within the selected band. The seek setting RSSI and SNR threshold can be set in the property window.

2 Frequency The Frequency Display indicates the frequency in kHz. To change the Frequency, drag the Slider pointer in the Frequency Slider Bar to the desired frequency.
Bar, AFC, AFC Rail indicator will be red if the tuned frequency is in an AFC rail state, otherwise the Valid indicator will be grey. The Valid indicator will be green if the AM frequency meets the RSSI and SNR seek settings.

3 Volume, Select the Si473x output volume (0­63) by moving the slider bar pointer. Press the Mute button Mute to mute the radio. If the radio is muted the button will be red. Press the Mute button again to remove the muting.

4 Auto Scan The Auto Scan button will find all the stations with an RSSI and SNR above the seek settings in the property window. After the scan is completed, the number of stations found will be displayed and each station will be available in the drop down box. Also, a red indicator mark will be displayed on the Frequency Slider Bar (2) for each station. The “To Presets” Button will program the preset buttons (5) with the 12 strongest stations.
5 Presets Press the desired button to tune to the frequency displayed on the button. To store a new value to the preset button, tune to the desired frequency and then press and hold the desired button for 1.5 seconds. The button will then change to indicate the stored frequency. This information is stored to a file and used the next time the program is run.

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Table 25. AM Receiver Window Descriptions (Continued)

Name

Description

6 Status The RSSI indicator displays the RSSI of the signal in dBuV. The SNR indicator displays the SNR of the received signal in dB. The varactor value specifies the capacitance of the tuning front-end. A value of 6143 means that the maximum capacitance is being presented at the AM input and a value of 1 means that the varactor is at its minimum value. The AGC Index indicator displays the AGC status. The Soft Mute indicator displays the estimated attenuation applied to the signal based on RSSI and SNR values.

7 Function, The Function buttons are used to boot up the device in different mode. Band Using the Band Selection drop down box, you can select different AM, LW, or SW bands. The
Selection drop down box will only appear with LW or SW enabled device. If an SW band is selected using the SW/WB Antenna Card, set the varactor to 1 for best performance. LW not support with SW/ WB Antenna Card.

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8.3. AM Receiver Property Settings Window AM receiver settings can be configured through the properties window by selecting WindowProperties.
Properties are grouped into categories which can be selected from the drop- down box in the upper right of the
window. For convenience, all AM receiver properties are also located in WindowPropertiesAM: All.

Figure 79. AM Receiver Settings Property Window

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Figure 80. AM Receiver Settings Property Window for Si474x

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Table 26. AM Receiver Property Window Descriptions

Name

Description

Range

Applicable Devices

AGC Attack Rate Sets the AGC attack rate. Larger values provide slower attack and smaller values provide faster

4­248

Si4740/41/42/43/ 44/45

attack.

AGC Frontend Sets gain index backup (ATTN_BACKUP) for exter-

0­28

Attn. Backup nal attenuator. For Si4743EVB, 12 and 20 are recom- (AM Component

Steps

mended for “Passive” and “Active” external

2.E.5)

Si4740/41/42/43/ 44/45

attenuators, respectively.

AGC Frontend Sets minimum gain index. For Si4743EVB, 19 is rec-

0­28

Si4740/41/42/43/

Min. Gain Index ommended.

(AM Component

44/45

2.E.5)

AGC Index Sets gain index when “AGC Override” is On.

0­

All

37+ATTN_BACKU

P

AGC Override When “Off”, AGC is enabled. When “On”, AGC is dis-

ON/OFF

All

abled and gain index is forced to “AGC Index”

AGC Release Sets the AGC release rate. Larger values provide

Rate

slower release and smaller values provide faster

4­248

Si4740/41/42/43/ 44/45

release.

External For Si474x-EVB daughtercard versions > 1.2. When ACTIVE, PASSIVE Si4740/41/42/43/

Attenuator Select using an antenna, set this property to PASSIVE. If

44/45

you are connecting a signal generator directly, set

this to ACTIVE.

Auto Volume Sets the maximum gain allowed for automatic volume Cont. Max Gain control.
(dB)

6.02­90.3 dB

Si473x-C40 and later, Si474x

De-Emphasis De-emphasis filter setting allows the user to select

ON/OFF

All

whether to turn on/off the de-emphasis filter.

Power Line Noise ON enables high pass filter to filter out the 50/60 Hz

Filter

tone.

ON/OFF

Si473x-C40 and later, Si4740/41/42/
43/44/45

Reference Clock This field is used to specify the frequency of the refer- 31130­34406 Hz

All

Frequency (Hz) ence clock. The Reference clock frequency divided

by the pre-scalar must be in the range of 31.130 to

34.406 kHz.

Reference Clock Reference Clock Pre-scalar divides down RCLK fre-

1­4095

All

Prescaler quency by the value specified in this field. The Refer-

ence clock frequency divided by the pre-scalar must

be in the range of 31.130 to 34.406 kHz.

Digital DCLK ON uses falling edge of DCLK for sampling. Falling Edge

ON, OFF

Si4705/06, Si4731/35/37/39,

Si4730/34/36/38-

D60 and later,

Si4741/43/45,

Si4784/85

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Table 26. AM Receiver Property Window Descriptions (Continued)

Name

Description

Digital Format Format of digital audio output.

Range
I2S, Left-Justified, DSP

Digital Mono ON enables mono in digital audio output. Mode Enable

ON, OFF

Digital Sample Digital audio output bit precision. Precision

8-bit, 16-bit, 20-bit, 24-bit

Digital Sample Rate Hz

DFS sample rate for digital input signal. Recom-

0, 32000­48000 Hz

mended values are: 32 kHz, 44.1 kHz, or 48 kHz.

Over-sampling rate must be set in order to satisfy a

minimum DCLK of 1 MHz. Sample rate must be set to

0 before DCLK/DFS is removed.

Noise Blanker Delay in microseconds before applying noise blank-

Delay

ing to the original samples.

Noise Blanker Sets the threshold for detecting impulses in dB above

Detect Threshold the noise floor. If set to 0, impulse noise blanking is

disabled.

Noise Blanker IIR Sets the cut-off frequency for the low pass filter that is

Filter

used for noise floor estimation in noise blanker detec-

tion.

Noise Blanker Interval original samples are replaced by interpolated

Interval

clean samples.

Noise Blanker Maximum noise blanking rate.

Rate

Band Bottom The lower frequency limit for the seek function. This

Limit (kHz) is set automatically by the GUI based on spacing

selection.

Band Top Limit (kHz)
Channel Filter

The upper frequency limit for the seek function.
Channel Filter allows the user to select the bandwidth of the bandpass channel filter.

125­205 µs
0 ­ 90 dB
300­1600
8 ­ 48 µs
100 ­ 6400 Hz
10 kHz Spacing: 520 kHz
9 kHz Spacing: 510 kHz 1710 kHz
1, 1.8, 2, 3, 4, 6 kHz

Applicable Devices Si4705/06,
Si4731/35/37/39, Si4730/34/36/38-
D60 and later, Si4741/43/45,
Si4784/85 Si4705/06, Si4731/35/37/39, Si4730/34/36/38D60 and later, Si4741/43/45, Si4784/85 Si4705/06, Si4731/35/37/39, Si4730/34/36/38D60 and later, Si4741/43/45, Si4784/85 Si4705/06, Si4731/35/37/39, Si4730/34/36/38D60 and later, Si4741/43/45, Si4784/85 Si4742/43/44/45
Si4742/43/44/45
Si4742/43/44/45
Si4742/43/44/45
Si4742/43/44/45
All
All
All

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Table 26. AM Receiver Property Window Descriptions (Continued)

Name

Description

Seek Mode Seek mode specifies the behavior of seek when it

reaches either end of the AM band. The default value

makes the seek wrap around and start at the other

end of the AM band. The other option makes seek

stop if it reaches either end of the AM band without

finding an AM station.

Seek RSSI Threshold
(dBµV)

Seek RSSI threshold is a metric that is used when using the seek feature. Any signal with an RSSI lower than the threshold will be ignored during a seek.

Seek SNR Seek SNR threshold is a metric that is used when Threshold (dB) using the seek feature.

References

• Silicon Labs Community
• Silicon Labs
• Silicon Labs
• Products - Silicon Labs

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