ANALOG DEVICES ADRF5715-EVALZ Silicon Digital Attenuator User Guide
- May 15, 2024
- Analog Devices
Table of Contents
ANALOG DEVICES ADRF5715-EVALZ Silicon Digital Attenuator
Specifications
- Product Name: ADRF5715 Silicon Digital Attenuator
- Attenuation Control Range: 16 dB
- Frequency Range: 1 MHz to 30 GHz
- Manufacturing Process: Silicon on Insulator (SOI)
Product Usage Instructions
Equipment Needed
- DC power supplies
- Network analyzer
General Description
The ADRF5715 is a 1-bit digital attenuator with a 16 dB attenuation control range manufactured using the silicon-on-insulator (SOI) process.
Evaluation Board Hardware
- The ADRF5715-EVALZ is a connectorized board assembled with the ADRF5715 and its application circuitry.
- All components are on the primary side of the board.
Board Layout
The ADRF5715-EVALZ is designed using RF circuit design techniques on a 4-layer printed circuit board (PCB).
Power Supply and Control Inputs
- The board has two power supply inputs, three control inputs, and a ground connection.
- Connect the power supplies as per Table 1 in the manual.
- The typical current consumption is between 630 mA and 660 mA.
FAQ
Q: What is the typical current consumption for the ADRF5715?
- A: The typical total current consumption for the ADRF5715 is between 630 mA and 660 mA.
FEATURES
- Full-featured evaluation board for the ADRF5715
- Easy connection to test equipment
- Additional throughline for calibration
EQUIPMENT NEEDED
- DC power supplies
- Network analyzer
GENERAL DESCRIPTION
- The ADRF5715 is a 1-bit digital attenuator with a 16 dB attenuation control range manufactured in the silicon-on-insulator (SOI) process.
- This user guide describes the ADRF5715-EVALZ evaluation board, which is designed to simply evaluate the features and performance of the ADRF5715. A photograph of the evaluation board is shown in Figure 1.
- For full details on the ADRF5715, see the ADRF5715 data sheet, which should be consulted in conjunction with this user guide when using the ADRF5715-EVALZ.
ADRF5715-EVALZ EVALUATION BOARD PHOTOGRAPH
EVALUATION BOARD HARDWARE
OVERVIEW
- The ADRF5715-EVALZ is a connectorized board, assembled with the ADRF5715 and its application circuitry.
- All components are placed on the primary side of ADRF5715-EVALZ. An assembly drawing for the ADRF5715-EVALZ is shown in Figure 8, and an evaluation board schematic is shown in Figure 7.
BOARD LAYOUT
-
The ADRF5715-EVALZ is designed using RF circuit design techniques on a 4-layer printed circuit board (PCB). The PCB stack-up is shown in Figure 2.
-
The outer copper layers are 1.5 oz (2.2 mil) thick and the inner layers are 0.5 oz (0.7 mil) thick.
-
The top dielectric material is 12 mil Rogers 4003, which provides 50 Ω controlled impedance and optimizes the high-frequency performance.
-
All RF traces are routed on the top layer, and the second layer is used as the ground plane for RF transmission lines.
-
The remaining two layers are also ground planes filled with FR4 material to manage the thermal rise during high-power operations and
are supported with dense and filled vias to the PCB bottom for thermal relief. The overall board thickness is approximately 62 mil for mechanical strength. -
The RF transmission lines are designed using a coplanar wave-guide (CPWG) model with a width of 16 mils and ground spacing of 6 mils to have a characteristic impedance of 50 Ω. Ground via fences are arranged on both sides of the CPWG to improve isolation between nearby RF lines and other signal lines.
-
The exposed ground pad of the ADRF5715, which is soldered on the PCB ground pad, is the main thermal conduit for heat dissipation.
-
The PCB ground pad is densely populated with filled, through vias to provide the lowest possible thermal resistance path from the top to the bottom of the PCB.
-
The connections from the package ground lead to the ground are kept as short as possible.
POWER SUPPLY AND CONTROL INPUTS
- The ADRF5715-EVALZ has two power-supply inputs, three control inputs, and a ground, as shown in Table 1. The DC test points are populated on VDD, VSS, D0, and GND. A 3.3 V supply is connected to the DC test points on VDD, and the −3.3 V supply is connected to the DC test points on VSS. A ground reference can be connected to GND. Connect the control input, D0, to 3.3 V or 0 V.
- The typical total current consumption for the ADRF5715 is between 630 mA and 660 mA.
- The VDD and VSS supply pins and control pins of the ADRF5715 are decoupled with 100 pF capacitor.
Table 1. Power Supply and Control Inputs
RF INPUTS AND OUTPUTS
The ADRF5715-EVALZ has four edge-mounted, 2.92 mm connectors for the RF inputs and outputs, as shown in Table 2.
Table 2. RF Inputs and Outputs
The ADRF5715-EVALZ is shipped together with a thru line that calibrates out the board loss effects from the measurements determining the device performance at the pins of the IC.
TEST PROCEDURE
BIASING SEQUENCE
To bias up the ADRF5715-EVALZ, perform the following steps.
- Ground the GND test point.
- Bias up the VDD test point.
- Bias up the VSS test point.
- Bias up the D0 test point.
- Apply an RF input signal.
- The ADRF5715-EVALZ is shipped fully assembled and tested. Figure 3 provides a basic test setup diagram to evaluate the s-parameters using a network analyzer.
- Perform the following steps to complete the test setup and verify the operation of the ADRF5715-EVALZ:
- Connect the GND test point to the ground terminal of the power supply.
- Connect the VDD test point to the voltage output terminal of the 3.3 V supply.
- Connect the VSS test point to the voltage output terminal of the −3.3 V supply. Note that the current from the VDD test point is around 130 μA and from the VSS test point is around 500 μA.
- Connect the D0 test point to the voltage output terminal of the 3.3 V supply. The ADRF5715 can be configured in different modes by connecting the control test points to 3.3 V or 0 V, as shown in Table 3.
- Connect a calibrated network analyzer to the ATTIN and ATT-OUT 2.92 mm connectors. Sweep the frequency from 100 MHz to 30 GHz and set the power to 10 dBm.
- The ADRF5715-EVALZ is expected to have an insertion loss of 1.15 dB at 30 GHz. See the expected results in Figure 4.
- Additional test equipment is needed to fully evaluate the device’s functions and performance.
- For third-order intercept point evaluation, use two signal generators and a spectrum analyzer. A high-isolation power combiner is also recommended.
- For power compression and power handling evaluations, use a 2-channel power meter and a signal generator.
- A high enough power amplifier is also recommended at the input. Test accessories, such as couplers and attenuators, must have enough power handling.
- Note that the measurements performed at the 2.92 mm connectors of the ADRF5715-EVALZ include the losses of the 2.92 mm connector and the PCB.
- The thru line must be measured to calibrate out the effects on the ADRF5715-EVALZ. The thru line is the summation of an RF input line and an RF output line that is connected to the device and equal in length.
Table 3. Control Voltage Truth Table
TEST PROCEDURE
EXPECTED RESULTS
EVALUATION BOARD SCHEMATIC AND ARTWORK
ORDERING INFORMATION
BILL OF MATERIALS
Table 4. Bill of Materials for ADRF5715-EVALZ
2| C1 and C2| Capacitors, 100 pF, 50 V, C0402 package| Murata|
GCM1555C1H101JA16D
---|---|---|---|---
1| R1| Resistors, 0 Ω, 1/10 W, R0402 package| Yageo| RC0402JR-070RL
2| ATTIN and ATTOUT| Surface-mount test points| Hirose Electronic Co.| HK-LR-
SR2(12)
4| D0, GND, VDD, and VSS| Surface-mount test points| Components| TP-104-01-0X
| | | Corporation|
1| U1| Silicon digital attenuator, 1-bit, 1 MHz to 30 GHz| Analog Devices,
Inc.| ADRF5715
1| PCB| ADRF5715 evaluation board| Analog Devices| ADRF5715-EVALZ
ESD Caution
- ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection.
- Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high-energy ESD.
- Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.
Legal Terms and Conditions
By using the evaluation board discussed herein (together with any tools,
components documentation or support materials, the “Evaluation Board”), you
are agreeing to be bound by the terms and conditions set forth below
(“Agreement”) unless you have purchased the Evaluation Board, in which case
the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not
use the Evaluation Board until you have read and agreed to the Agreement. Your
use of the Evaluation Board shall signify your acceptance of the Agreement.
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Inc. (“ADI”), with its principal place of business at Subject to the terms and
conditions of the Agreement, ADI hereby grants to Customer a free, limited,
personal, temporary, non-exclusive, non-sublicensable, non-transferable
license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer
understands and agrees that the Evaluation Board is provided for the sole and
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Documents / Resources
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ANALOG DEVICES ADRF5715-EVALZ Silicon Digital
Attenuator
[pdf] User Guide
ADRF5715-EVALZ Silicon Digital Attenuator, ADRF5715-EVALZ, Silicon Digital
Attenuator, Digital Attenuator
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