ANALOG DEVICES ADuM6424A Evaluation Board User Guide

User Guide | EVAL-ADuM6421A

UG-1708

Evaluating the ADuM6221A Dual-Channel and the ADuM6420A/ADuM6421A/ADuM6422A/ADuM6423A/ADuM6424A Quad-Channel Isolators with Integrated DC-to-DC Converter

FEATURES

• isoPower integrated, isolated dc-to-dc converter
• Meets CISPR 32/EN 55032, Class B emission limits
• On-board 6 V to 9 V LDO power supply that provides 5 V to the VDDP pin
• 5 V input operation and selectable 3.3 V or 5 V isolated dc-to-dc converter output
• Screw terminal connectors for the following
  • LDO power supply
  • 5 V direct power supply
  • Off board PDIS control
  • Isolated output supply

EVALUATION KIT CONTENTS

• EVAL-ADUM6421ARNZ, includes the ADuM6421ABRNZ5
• EVAL-ADUM6421AURNZ, requires the ADuM6221A, ADuM6420A, ADuM6421A, ADuM6422A, ADuM6423A, or ADuM6424A to be ordered separately

DOCUMENTS NEEDED

• ADuM6221A data sheet
• ADuM6420A/ADuM6421A/ADuM6422A/ADuM6423A/ADuM6424A data sheet

GENERAL DESCRIPTION

The ADuM6221A and ADuM6420A/ADuM6421A/ADuM6422A/ADuM6423A/ADuM6424A devices integrate two and four iCoupler® on-off keying (OOK) digital isolation channels, respectively, and iCoupler chip scale isoPower® transformer technology.

This iCoupler transformer technology enables a small form factor integrated, reinforced isolated signal and power solution, in applications requiring up to 500 mW of isolated power.

Available dc-to-dc converter supply configurations and maximum available power at the elevated ambient temperatures are specified in the ADuM6221A and ADuM6420A/ADuM6421A/ADuM6422A/ADuM6423A/ADuM6424A data sheets, respectively.

The ADuM6221A and ADuM6420A/ADuM6421A/ADuM6422A/ADuM6423A/ADuM6424A devices provide regulated, isolated power that meets CISPR 32/EN 55032, Class B limits at full load on a 2-layer printed circuit board (PCB) with ferrite beads. Radiated emissions test plots of the EVAL-ADUM6421ARNZ/EVAL-ADUM6421AURNZ are provided in Figure 4 and Figure 5. All devices in the family include the same isolated dc-to-dc converter and are differentiated by directional digital channel configurations.

The EVAL-ADUM6421ARNZ includes the ADuM6421ABRNZ5 quad-channel digital isolator with integrated, isolated dc-to-dc converter. Alternatively, the EVAL-ADUM6421AURNZ leaves the isolator position unpopulated to support evaluation of the ADuM6221A, ADuM6420A, ADuM6421A, ADuM6422A, ADuM6423A, or ADuM6424A.

Full specifications for the ADuM6221A or ADuM6420A/ADuM6421A/ADuM6422A/ADuM6423A/ADuM6424A are available in the ADuM6221A data sheet or the ADuM6420A/ADuM6421A/ADuM6422A/ADuM6423A/ADuM6424A data sheet, respectively, which must be consulted in conjunction with this user guide when using the evaluation boards.

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS.

EVALUATION BOARD PHOTOGRAPHS

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Figure 1. EVAL-ADUM6421ARNZ

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Figure 2. EVAL-ADUM6421AURNZ

EVALUATION BOARD HARDWARE

USING THE EVALUATION BOARD

Figure 1 and Figure 2 show the EVAL-ADUM6421ARNZ and EVAL- ADUM6421AURNZ, respectively. The ADuM6221A and ADuM6420A/ADuM6421A/ADuM6422A/ADuM6423A/ADuM6424A can be powered directly or by the on-board low dropout (LDO) regulator. Either power scheme can be used without modification to the evaluation boards. The LDO input supply and return, Pin 1 and Pin 2, respectively, of Screw Terminal P1 (marked VIN_LDO and RTN_LDO in Figure 6 ), requires a power supply voltage of 6 V to 9 V. The LDO supply input is filtered by a ferrite bead network. The LDO generates the required 5 V to the ADuM6221A and ADuM6420A/ADuM6421A/ADuM6422A/ADuM6423A/ADuM6424A VDDP pin. A 9 V battery can power the evaluation boards (when testing for electromagnetic compatibility (EMC), for example). Alternatively, the ADuM6221A and ADuM6420A/ADuM6421A/ADuM6422A/ADuM6423A/ADuM6424A can be powered directly with a 5 V supply through Pin 1 of Screw Terminal P5 (marked VDDP in Figure 6 ).

In both power schemes, the power supply return connects to Pin 2 of Screw Terminal P1 or P5 (marked AGND1 in Figure 6 ).

The jumper on P6 must be installed to short Pin 3, pull the PDIS pin low, and enable the ADuM6221A and ADuM6420A/ADuM6421A/ADuM6422A/ADuM6423A/ADuM6424A when no external control signal is used.

Installing the jumper on P6 to short Pin 1 and Pin 2 pulls the PDIS pin high and disables the integrated dc-to-dc converter. The VISO supply pin output voltage is set to 5.0 V or 3.3 V by installing a 0 Ω resistor in the R1 pull- up position or a 0 Ω resistor in the R2 pull-down position, respectively.

LAYOUT RECOMMENDATIONS FOR EMC

Isolators are constructed with split paddles to galvanically isolate the primary and secondary sides of the devices. The ADuM6221A and ADuM6420A/ADuM6421A/ADuM6422A/ADuM6423A/ADuM6424A feature a split in the secondary side lead frame paddle, which can be used in conjunction with ferrite beads for lower radiated emissions. On the primary side, the dc-to-dc converter and digital isolator share a paddle. However, on the secondary side, isolated power and signal paths are galvanically separated from each other. The isolated supply and return paths must be externally routed to the signal isolation input supply pins, which provide a place to insert the ferrite beads.

The EVAL-ADUM6421ARNZ/EVAL-ADUM6421AURNZ provide an example of recommended layout practices using ferrite beads. To pass CISPR 32/EN 55032, Class B limits on a 2-layer PCB, the following layout guidelines are recommended:

• Place ferrite beads between the PCB trace or PCB plane connections, VISO (Pin 18), and GNDISO (Pin 17).
• Connect the VISO load (shown in Figure 6 ) using a PCB trace. Do not connect the VISO load to a power plane.
• Ensure that VISO (Pin 18) is connected through the E2 ferrite bead before connecting to the VISO load, as shown in Figure 3.
• Ensure that GNDISO (Pin 17) is connected by a trace to the GNDISO pins (Pin 15 and Pin 19) on the inside (device side) of the C7 100 nF capacitor.
• Ensure that the C4 capacitor is connected between VISO (Pin 18) and GNDISO (Pin 17) on the device side of the E1 ferrite bead and E2 ferrite bead.
• Ensure that there is a keep out area in the PCB layout around E1 and E2, as shown in Figure 3.
• Place the power delivery circuit close to the ADuM6221A and ADuM6420A/ADuM6421A/ADuM6422A/ADuM6423A/ADuM6424A to ensure the VDDP trace is as short as possible. The EVAL-ADUM6421ARNZ/EVAL-ADUM6421AURNZ PCB has a power delivery circuit located on the PCB with a short trace from the ADP7104ARDZ-5.0 regulator output (U1) to VDDP (Pin 11). This layout example minimizes the loop area in which high frequency flows. An increase in the loop area results in an increase in the emissions levels.
• Use Murata BLM18HE152SN1D ferrite beads (0603 size) for E3, E4, and E5 to improve emissions. Other ferrite beads can be used for E3, E4, and E5. However, the ferrite beads must be 0603 size due to the input power requirements.

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Figure 3. Layout Notes for EVAL-ADUM6421ARNZ/EVAL-ADUM6421AURNZ

CISPR 32/EN 55032 RADIATED EMISSIONS TEST RESULTS

The EVAL-ADUM6421ARNZ/EVAL-ADUM6421AURNZ have been tested to pass the CISPR 32/EN 55032, Class B standard.

The EVAL-ADUM6421ARNZ/EVAL-ADUM6421AURNZ were configured and tested with 5.0 V power supplied to the VDDP pin from the ADP7104ARDZ-5.0 regulator output. The ADP7104ARDZ-5.0 regulator input is supplied from a standard 9 V battery. VISO can be loaded with six 300 Ω, 0805 size, surface-mount device (SMD) resistors in parallel for a total load of 50 Ω or 100 mA load at 5 V.

Measurements carried out according to the CISPR 32/EN 55032, Class B standard in a 10 meter semianechoic chamber from 30 MHz to 1 GHz are shown in Figure 4 and Figure 5. Figure 4 shows the results of the peak horizontal scan (the worst case) from 30 MHz to 1 GHz with 100 mA, 5 V output. Figure 5 shows the results of the peak horizontal scan (the worst case) from 30 MHz to 1 GHz with 50 mA, 5 V output, and 5 Mbps signal on Channel A, Channel B, Channel C, and Channel D.

Table 1 shows the tabulated quasi peak (QP) results. These results show that the ADuM6221A and ADuM6420A/ADuM6421A/ADuM6422A/ADuM6423A/ADuM6424A emissions are below CISPR 32/EN 55032, Class B limits when tested on a 2-layer PCB with the use of ferrite beads. When tested with 5 V supplies, a 100 mA load, and a data rate of 0 Mbps on Channel A, Channel B, Channel C, and Channel D, the quasi peak margin limit is -3.6 dBµV/m. When tested with 5 V supplies, a 50 mA load, and a data rate of 5 Mbps on Channel A, Channel B, Channel C, and Channel D, the quasi peak margin limit is -6.0 dBµV/m.

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Figure 4. Peak Horizontal Scan from 30 MHz to 1 GHz with 100 mA, 5 V Output, 0 Mbps Signals on Channel A, Channel B, Channel C, and Channel D

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Figure 5. Peak Horizontal Scan from 30 MHz to 1 GHz with 50 mA, 5 V Output, and 5 Mbps Signals on Channel A, Channel B, Channel C, and Channel D

Table 1. ADuM6421A Test Results (QP Measurements)

Frequency
(MHz)| QP Level
(dBµV/m)| Limit CISPR 32/ EN 55032, Class B
(dBµV/m)| QP Margin from limit CISPR 32/EN 55032, Class B (dBµV/m)| Antenna Position| Antenna Height
(meters)| 5 V In, 5 V Out Output Current (mA)| Data Rate Channel x¹
(Mbps)| Pass or Fail
---|---|---|---|---|---|---|---|---
307.22| 27.3| 37| −9.7| Horizontal| 3.5| 100| 0| Pass
397.09| 30.2| 37| −6.8 | Horizontal| 2.5| 100| 0| Pass
417.90| 26.5| 37| −10.5| Horizontal| 2.5| 100| 0| Pass
791.47| 32.0| 37| −5.0| Horizontal| 1.0| 100| 0| Pass
919.07| 33.4| 37| −3.6| Horizontal| 1.0| 100| 0| Pass
183.22| 13.3| 30| −16.7| Horizontal| 3.0| 50| 5| Pass
310.90| 28.0| 37| −14.8 | Horizontal| 3.0| 50| 5| Pass
410.68| 28.5| 37| −8.5| Horizontal| 2.0| 50| 5| Pass
429.56| 27.8| 37| −9.2| Horizontal| 2.0| 50| 5| Pass
847.03| 31.0| 37| −6.0| Horizontal| 1.0| 50| 5| Pass

¹ Where x stands for Channel A, Channel B, Channel C, or Channel D.

EVALUATION BOARD SCHEMATIC AND ARTWORK

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Figure 6. EVAL-ADUM6421ARNZ/EVAL-ADUM6421AURNZ Schematic

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Figure 7. EVAL-ADUM6421ARNZ/EVAL-ADUM6421AURNZ Top Layer

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Figure 8. EVAL-ADUM6421ARNZ/EVAL-ADUM6421AURNZ Bottom Layer

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ORDERING INFORMATION

BILL OF MATERIALS

Table 2.

Reference Designator| Description| Manufacturer| Part Number
---|---|---|---
U2| Quad-channel isolator with integrated dc-to-dc converter| Analog Devices| ADuM6421ABRNZ5
U1| 20 V, 500 mA, low noise, complimentary metal-oxide semiconductor (CMOS) LDO| Analog Devices| ADP7104ARDZ-5.0
U3| Low power, 1 kHz to 20 MHz resistor set SOT-23 oscillator| Analog Devices| LTC6900CS5#PBF
C1| Capacitor, X7R, 16 V, 390 pF, 0603| AVX Corp| 0603YC391KAT2A
C2| Capacitor, X7R, 10 V, 1 μF, 0603| Würth Elektronik| 885012206076
C3, C4, C8 to C10, C21| Capacitors, X7R, 10 μF, 10 V, 0805| Würth Elektronik| 885012207026
C5 to C7, C11, C12| Capacitors, X7R, 0.1 μF, 0603| Wurth Elektronik| 885012206046
E3, E4, E5| Ferrite beads, 1500 Ω, 0603| Murata| BLM18HE152SN1D
E1, E2| Ferrite beads, 1.8 kΩ at 100 MHz, 0402| Taiyo Yuden| BKH1005LM182-T
Jumper| 100 mil (2.54 mm) jumper| Amphenol ICC (FCI)| 65474-001LF
P6| PCB connector, unshrouded header, 6 mm post height, 2.54 mm pitch| Würth Elektronik| 61300311121
P1, P2, P3, P4, P5| Connectors, PCB, terminal blocks, horizontal cable entry, 5 mm pitch| Würth Elektronik| 691 213 710 002
R11| Variable resistor, 1 MΩ trimming potentiometer, ½ W| Bourns| 3296W-1-105LF
R12| Resistor, 20.0 kΩ, 0603| Panasonic| ERJ-3EKF2002V
R6| Resistor, 100 kΩ, 0603| Panasonic| ERJ-3EKF1003V
R1| Resistor, 0 kΩ, 0402| Panasonic| ERJ-2GE0R00X
R16, R18, R19, R29| Resistors, 0 kΩ, 0603| Panasonic| ERJ-3GEY0R00V
TP1 to TP4, TP10 to TP13| Connectors, PCB test point| Keystone Electronics| 5015
TP7, TP9, TP14, TP16| Connectors, PCB test point, black| Vero Technology| 20-2137
TP5, TP6, TP8, TP15| Connectors, PCB test point, orange| Keystone Electronics| 5003

RELATED LINKS

AN-1349| PCB implementation guidelines to minimize radiated emissions on the ADM2582E/ADM2587E RS-485/RS-422 transceivers
AN-0971| Recommendations for control of radiated emissions with isoPower devices

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. This Agreement is made by and between you (“Customer”) and Analog Devices, 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 exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted is expressly made subject to the following additional limitations: Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board; and (ii) permit any Third Party to access the Evaluation Board. As used herein, the term “Third Party” includes any entity other than ADI, Customer, their employees, affiliates and in-house consultants. The Evaluation Board is NOT sold to Customer; all rights not expressly granted herein, including ownership of the Evaluation Board, are reserved by ADI. CONFIDENTIALITY. This Agreement and the Evaluation Board shall all be considered the confidential and proprietary information of ADI. Customer may not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation of use of the Evaluation Board or termination of this Agreement, Customer agrees to promptly return the Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customer may not disassemble, decompile or reverse engineer chips on the Evaluation Board. Customer shall inform ADI of any occurred damages or any modifications or alterations it makes to the Evaluation Board, including but not limited to soldering or any other activity that affects the material content of the Evaluation Board. Modifications to the Evaluation Board must comply with applicable law, including but not limited to the RoHS Directive. TERMINATION. ADI may terminate this Agreement at any time upon giving written notice to Customer. Customer agrees to return to ADI the Evaluation Board at that time. LIMITATION OF LIABILITY. THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED “AS IS” AND ADI MAKES NO WARRANTIES OR REPRESENTATIONS OF ANY KIND WITH RESPECT TO IT. ADI SPECIFICALLY DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, TITLE, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS. IN NO EVENT WILL ADI AND ITS LICENSORS BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES RESULTING FROM CUSTOMER’S POSSESSION OR USE OF THE EVALUATION BOARD, INCLUDING BUT NOT LIMITED TO LOST PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL. ADI’S TOTAL LIABILITY FROM ANY AND ALL CAUSES SHALL BE LIMITED TO THE AMOUNT OF ONE HUNDRED US DOLLARS ($100.00). EXPORT. Customer agrees that it will not directly or indirectly export the Evaluation Board to another country, and that it will comply with all applicable United States federal laws and regulations relating to exports. GOVERNING LAW. This Agreement shall be governed by and construed in accordance with the substantive laws of the Commonwealth of Massachusetts (excluding conflict of law rules). Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby submits to the personal jurisdiction and venue of such courts. The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is expressly disclaimed.

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Rev. B

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