ADAA2457

PRE-RELEASE

100Mbps Automotive Audio Bus (A2B 2.0) Transceiver with OASPI Interface

Analog Devices ADAA2457 Product Info

10 February 2026 6

Features

A2B 2.0 BUS FEATURES
- Line topology
  - Single main node, up to 10 subordinate nodes
  - Up to 15 m between nodes and up to 50 m overall cable length
- Clock synchronous multichannel I2S/TDM data over distance
  - 119 upstream and 119 downstream channels per link (for 48 kHz sampled 16-bit channels)
  - Individual 16, 24, or 32-bit channels
  - Phase-aligned sampling at all nodes
  - Low latency node to node communication
- Asynchronous data over distance
  - 10 Mbps Ethernet Layer-2 A2B MAC-PHY
  - unicast/multicast/broadcast
  - SPI to SPI, SPI to I2C
  - I2C to I2C
  - Mailbox message exchanges up to 126 bytes
  - GPIO to GPIO

ADAA2457 TRANSCEIVER FEATURES
- Configurable as A2B bus main node or subordinate node
- Node descriptor/one-time programmable (OTP) memory
- Auto-discovery
- Line diagnostics per link without bias
- Wake-on-A2B activity
- Clock output on subordinate nodes without bus operation
- EMC, ESD optimized for automotive applications
ADAA2457 INTERFACE FEATURES
- Ethernet interface via OA SPI
- 8 configurable serial IO (SIO) (I2S/TDM/PDM) data pins
  - 2 SIO (I2S/TDM) clock domains
- I2C and SPI interfaces
- 4 PWM outputs
- 2 general-purpose ADC inputs
- Up to 16 GPIOs (multiplexed onto other pins)
- 4-channel ASRC input and output

Part details & applications

The Automotive Audio Bus A2B® 2.0 transceivers (ADAA245x) quadruple the available bus bandwidth relative to existing A2B 1.01 devices making them particularly well suited for high definition (HD) audio transport in ECU connectivity applications. ADAA245x devices are compatible with existing A2B 1.0 cabling/connector infrastructures and fully supported by SigmaStudio+®, a unified software framework from Analog Devices. Additionally, the ADAA245x family and future A2B 2.0 devices can easily be connected to A2B 1.0 branches using their integrated, industry-standard I2S, I2C, and SPI interfaces.

A2B provides a multichannel, multistream digital audio link over distances of up to 15 m between nodes. It embeds bidirectional synchronous pulse code modulation (PCM) data (for example, digital audio from I2S/TDM interface), clock, and synchronization signals, as well as asynchronous data (for example, Ethernet packets) onto a single differential wire pair. A2B supports a direct point to point connection or line topology with multiple, daisy-chained nodes at different locations that can contribute and/or use time division multiplexed channel content.

A2B is a single main node, multiple subordinate node system where the transceiver at the host controller is part of the main node. The main node generates clock, synchronization, and framing for all subordinate nodes. The main A2B transceiver is programmable over a control bus (I2C or SPI) for configuration and read back. An extension of this control bus is embedded in the A2B data stream, which grants direct access to registers and status information on subordinate transceivers, as well as I2C to I2C, SPI to SPI, SPI to I2C and GPIO to GPIO communication over distance.

The transceiver can connect directly to general-purpose digital signal processors (DSPs) or microprocessors, field-programmable gate arrays (FPGAs), application specific integrated circuits (ASI

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