A2B EVM with SigmaDSP and stereo audio input and output

The A²B module EVM kit provides a platform for initial software development of A²B applications using Clockworks AB0001 (AD2428) A²B module or the AB0331 (AD2437) A²B module. It’s also a convenient way to quickly add 2 channel audio input and output to an A²B system for testing.

The EVM board does not include the two A²B connectors used on the Clockworks AB0003 (AD2428) module or the AB0337 (AD2437) module and therefore can not be used with those modules.

The A²B module EVM kit operates in two modes. In the A²B client (sub-node) mode configuration it acts like other client nodes and you can add up to 10 (AD2428) or 15 (AD2437Z) of them.

In the A²B root (main) mode of the EVM, this board sits as the first node in the A²B network.

Development is normally done using ADI’s SigmaStudio+ with the A²B extensions. An ADI USBi or equivalent is used to interface the host system to the EVM.

If you’re new to A²B development you should look over the EVM manual as it discusses in detail the steps to use it. Analog Devices also has quite a bit of documentation on their website and Wiki pages for A²B; generally user manuals for any A²B board can be used to understand A²B system development.

The EVM board includes an Analog Devices ADAU1761 SigmaDSP to provide stereo analog input and output along with programmable DSP functions. Applications for the ADAU1761 are developed using SigmaStudio 4.7. A .xml file exported from that tool is used by SigmaStudio+ to load the DSP application at runtime.

The EVM board, without the A²B module, can be used for SigmaDSP development using Sigma Studio. To do this it must be configured as a master mode board to provide the MCLK signal the ADAU1761 needs.

An external power supply is used. For AD2428 based systems a 12V 6W supply is sufficient. An onboard regulator provides the 9V needed for the AD2428 CFG0 phantom power scheme. For AD2437 based system an external 24V 60W supply to support the CFG4 phantom power scheme is suggested.

The AB0001 and AB0331 modules that are used with this board support ADI’s 2 wire phantom power schemes. ADI also offers AD2437 systems with either XLR or RJ-45 connectors and differing implementations of the CFG4 power system. Clockworks offers isolators/adapters for bridging A²B data between different power/connector schemes.

A2B modules and 2nd gen EVM (AB0020) datasheet