Analog Devices WD1BZ User manual

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A2B Network Configuration Example:
WD1BZ (M) - WB1BZ (BPS) - WG1BZ (LPS) - WD1BZ (LPS)
Purpose
The purpose of this document is to guide the user on the steps required to configure an example
A2B network featuring Local Powered Slave (LPS) nodes using A2B evaluation boards.
•Example Project: WD1BZ Local Powered Master <-> WB1BZ Bus Powered Slave <-> WG1BZ
Local Powered Slave <-> WD1BZ Local Powered Slave Using the ADAU1761 SigmaDSP
Audio CODEC (Bypassing the ADAU1452 SigmaDSP Audio Processor)
REVISION HISTORY
Revision
Description of Change
Date
Author
B
Added TDM8 XML file reference and LED table for bus drop off.
A
Initial Release
August 26th, 2021
ADI
Contents
Purpose................................................................................................................................................................................... 1
System and Software Requirements....................................................................................................................................... 2
Hardware Requirements......................................................................................................................................................... 2
Example Project 1 .................................................................................................................................................................. 3
Jumper Settings.................................................................................................................................................................. 3
Important Notes.................................................................................................................................................................. 4
Background why the above change is required.............................................................................................................. 5
Procedure............................................................................................................................................................................ 8
Audio Stream Assignments................................................................................................................................................ 8
Note on Slave Evaluation Boards....................................................................................................................................... 9

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System and Software Requirements
S. No
Software Component
Version
Comments
1.
A2B Software*
19.4.0*
Copy the DLL’s (A2B.DLL, A2BStack.DLL) into SigmaStudio
Installation Directory. Refer to the A2B Quick Start Guide for more
details (C:\Analog Devices\ADI_A2B_Software-Rel19.4.0\Docs)
2
SigmaStudio
4.6*
SigmaStudio 4.6 product page:
https://www.analog.com/en/design-center/evaluation-hardware-
and-software/software/ss_sigst_02.html#software-overview
*Please contact A2B SW team for latest updates.
Hardware Requirements
S. No
Name of Board
Type of Board/ Node
Quantity
1
EVAL-AD2428WD1BZ Rev. 1.1
Master/ Local Powered Slave (LPS)
2
2
EVAL-AD2428WB1BZ Rev. 2.0 or 2.1
Bus Powered Slave (BPS)
1
3
EVAL-AD2428WG1BZ Rev. 2.3
Local Powered Slave (LPS)
1
4
Twisted Pair A2B Cable with DuraClik Connectors
-
3
5
12V Power Supply
-
3
6
USBi I2C Adapter
v1.5
1
7
Audio source (non-grounded)
e.g., PC/Mobile phone
1
8
Aux Cable
-
4
9
Audio Sink Devices
3.5mm Jack Headphones
4

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Example Project 1
WD1BZ (Master) <-> WB1BZ (BPS) <-> WG1BZ (LPS) <-> WD1BZ (LPS) Node Using the ADAU1761 SigmaDSP
Audio CODEC (Bypassing the ADAU1452 SigmaDSP Audio Processor)
Jumper Settings
Place the jumpers on WD1BZ Master and WD1BZ LPS boards as per the tables below.
Note: WB1BZ and WG1BZ boards do not feature any jumpers.
Jumper
Master
Comments
JP1 (A2B power)
Install
-
JP2
Uninstall
Install when phantom power or hybrid power support is required
JP3
Uninstall
JP4 (BOOT)
Install
Self-Boot option disabled
JP5 (BCLK)
3-4
ADAU1452_BCLK_OUT0 -> AD2428_BCLK
JP6 (SYNC)
3-4
ADAU1452_LRCLK_OUT0 -> AD2428_SYNC
JP7 (DRX0)
3-4
ADAU1452_SDATA_OUT0 -> AD2428_DRX0
JP8 (DRX1)
2-3
ADAU1452_SDATA_OUT1 -> AD2428_DRX1
If Secondary Rx data line DRX1 is desired. Uninstall if only primary data
line DRX0 is required.
JP9 (DTX1)
3-4
AD2428_DTX1 -> ADAU1452_SDATA_IN1
If Secondary Tx data line DTX1 is desired. Uninstall if only primary data
line DTX0 is required.
JP10 (DTX0)
1-2
AD2428_DTX0 -> ADAU1452_SDATA_IN0
JP11 (ADMP621 CLK)
Uninstall
-
JP12 (NTC)
Install
-
JP13 (A2B_REG)
Uninstall
-
JP14 (VOLTAGE)
Uninstall
Install/ Uninstall depending on VIN requirement.
Installed -> VIN = 7V
Uninstalled -> VIN = 8V
JP19 (1961 BCLK)
1-2
ADAU1761 MCLK from CLKOUT of ADAU1452

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Jumper
WD1BZ LPS
Comments
JP1 (A2B power)
Install
-
JP2
Uninstall
Install when phantom power or hybrid power support is required
JP3
Uninstall
JP4 (BOOT)
Install
Self-Boot option disabled
JP5 (BCLK)
1-3
AD2428_BCLK -> ADAU1961_BCLK
JP6 (SYNC)
1-3
AD2428_SYNC -> ADAU1961_LRCLK
JP7 (DRX0)
1-3
ADAU1961_ADC -> AD2428_DRX0
JP8 (DRX1)
Uninstall
-
JP9 (DTX1)
Uninstall
-
JP10 (DTX0)
2-3
AD2428_DTX0 -> ADAU1961_DAC
JP11 (ADMP621 CLK)
Uninstall
-
JP12 (NTC)
Install
-
JP13 (A2B_REG)
Uninstall
-
JP14 (VOLTAGE)
Uninstall
Install/ Uninstall depending on VIN requirement.
Installed -> VIN = 7V
Uninstalled -> VIN = 8V
JP19 (1961 BCLK)
2-3
ADAU1761 MCLK from AD2428_BCLK
Important Notes
1. WB1BZ and WG1BZ have similar digital BOM section (the signal routing path is almost
identical). Hence, boards can be swapped with each other in the A2B discovery chain.
2. WD1BZ LPS board can also be swapped with any of the above boards, but that would
require some minor software modifications.
a. TDM mode needs to be changed from TDM2 to TDM8.
b. The above modification implies changing the peripheral (CODEC) programming
XML file to “A2B_ADAU1761_Slave_TDM8.xml”, as shown next.

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Background why the above change is required
Audio routing mechanism in ADAU1761 when using TDM8 mode is a little tricky. In the current
project, it is assumed that only 2 channels are fed as input to ADAU1761.
In WD1BZ schematics, there is no A2B CLKOUT signal connection to the ADAU1761 CODEC, unlike
in WB1BZ and WG1BZ boards.
As shown in the picture below, in the WD1BZ board, only the AD2428_BCLK signal can be
connected to the MCLK, and since the CODEC MCLK needs to run at 12.288MHZ, TDM8 must be
selected.

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Since on WB1BZ and WG1BZ boards, ADR2/CLKOUT A2B transceiver pin can serve as an
additional MCLK generator to the connected DAC’s/ CODEC, the above restriction is not
applicable. See picture below.
Therefore, the TDM settings are kept the same for the WB1BZ and WG1BZ boards.

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As stated earlier, users can swap WB1BZ and WG1BZ boards without any issue in the A2B chain.
But when swapping with a WD1BZ as a LPS node, make sure the TDM mode is changed from
TDM2 to TDM8.
The CLKOUT parameter is a “don’t care” in the WD1BZ device property settings, as there is no
physical connection on this particular board from the ADR2/CLKOUT A2B transceiver pin to the
CODEC MCLK pin. Therefore, leave this setting as-is.

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Procedure
1. Make the hardware connections as follows: WD1BZ (Master) <-> WB1BZ (BPS) <-> WG1BZ (LPS) <->
WD1BZ (LPS) using UTP cables.
2. Make sure the jumpers are configured as per the tables above.
3. Open the A2B schematics: A2BSchematics/Jabra A2B_4_node_D1_B1_G1_D1.dspproj
4. Link Compile Download the A2B schematics onto the target.
5. Feed audio data by connecting the Aux cables to the Line-In connectors.
6. Verify audio data is received on the other node end Line-Out with the help of headphones.
Audio Stream Assignments

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By default, in the upstream direction, upstream slot0 and slot1 (from WGZ and WD1BZ LPS) will
be played over the L and R channels of the headphones connected to the Master node.
To hear the upstream slot2 audio channel added by the WB1BZ node, open the ADAU1452 project
file, Link Compile Connect and change the MUX selection as shown below.
Note on Slave Evaluation Boards
1. It is observed sometimes that the node gets dropped when an Aux cable or headphones are
connected after the system is discovered, up and running. The following LEDs indicate that a
particular node is dropped from the A2B bus.
Node
LED Label
WB1BZ
D9
WG1BZ
D9
WD1BZ LPS
LED1
2. This could be a GND problem. Try feeding the audio input from a standalone mobile phone
etc., but in any case, it´s best to ensure the node is not active when plugging aux cables
and/or headphones.
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