User Guide Rev. 3.0
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Overview

Features and Benefits

  • ADAA2457 A2B 2.0 Transceiver
  • Flexible Audio Interfaces – Multichannel I2S/TDM/PDM support with two independent clock domains and 4-channel ASRC input/output.
  • Versatile Connectivity – Ethernet via OA SPI with 10 Mbps Layer-2 A2B MAC-PHY supporting unicast, multicast, and broadcast.
  • Configurable I/O – Up to 16 multiplexed GPIOs, 8 serial data pins, 4 PWM outputs, 2 ADC inputs, plus I2C and SPI interfaces.
  • Main/Subordinate Node Operation – Supports local power configuration for both node types.
  • Breakout Board Design – Includes dual 24-pin headers for custom hardware interfacing and rapid prototyping.
  • High-Speed SPI-to-SPI Communication – Enables seamless integration with external SPI-based devices.
  • Integrated Power Management – Two MAX20075D 600mA step-down switching regulators for stable operation.
  • Diagnostic & Status LEDs – Visual indicators for power, GPIO/PWM activity, interrupts, and system status.
  • 100-Pin Connector – Designed for easy interfacing with SOM carrier boards and A2B base boards.
  • Onboard EEPROM – Stores configuration data and device identification.

Product Details

The ADAA245X-EV-A1CA Mini Module is a compact, cost-effective breakout board designed to accelerate development and evaluation of Automotive Audio Bus (A2B®) systems. It interfaces seamlessly with DSP carrier boards and audio base boards via a 100-pin connector and supports custom hardware integration through a 32-pin (0.1") header. The board functions as either a main or subordinate node, with flexible local power configurations to suit diverse system topologies.

In an A2B network, the main transceiver located at the host controller generates clock, synchronization, and framing signals for all subordinate nodes. It is programmable over I²C or SPI, and the control bus is embedded within the A2B data stream, allowing direct access to subordinate transceiver registers and any connected peripherals.

The ADAA245X-EV-A1CA supports direct connections to PDM microphones and a wide range of peripherals via I2C, SPI, OA-SPI, and a multichannel I2S/TDM interface with two independent clock domains. Additional features include up to 16 multiplexed GPIOs, 4 PWM outputs, 2 ADC inputs, and a 4-channel ASRC input/output for asynchronous sample rate conversion. Integrated MAX20075D step-down regulators provide stable power, while onboard diagnostic LEDs offer visual feedback for power, status, GPIO/PWM activity, and interrupts.

This board is part of a modular evaluation platform that supports various A2B configurations, enabling developers to validate system performance across multiple use cases.

Note: The ADAA245x-EV-A1CA evaluation board can be used either stand-alone OR when combined with the ADAA24xx-EV-B2BX board to emulate an intelligent A2B-connected node.

Applicable Parts

Documentation & Resources

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