Overview

Features and Benefits

A2B BUS FEATURES
  • Line topology
    • Single master, multiple slave
    • Up to 15 m between nodes and up to 40 m overall cable length
  • Communication over distance
    • Synchronous data
      • Multichannel I2S/TDM to I2S/TDM
      • Clock synchronous, phase aligned in all nodes
      • Low latency slave to slave communication
    • Control and status information I2C to I2C
    • GPIO over distance
  • Bus power or local power slave nodes
  • Configurable with SigmaStudio graphical software tool
  • Qualified for automotive applications
A2B TRANSCEIVER FEATURES
  • Configurable as A2B bus master or slave (AD2428W)
  • I2C interface
  • 8-bit to 32-bit multichannel I2S/TDM interface
    • I2S/TDM/PDM programmable data rate
    • Up to 32 upstream and 32 downstream channels
  • PDM inputs for 4 high dynamic range microphones on masters or slaves
  • Support for receiving I2S data on nodes with up to 4 PDM microphones
  • Unique ID register for each transceiver
  • Support for crossover or straight-through cabling
  • Programmable settings to optimize EMC performance

Product Details

The Automotive Audio Bus (A2B®) provides a multichannel, I2S/TDM link over distances of up to 15 m between nodes. It embeds bidirectional synchronous pulse-code modulated (PCM) data (for example, digital audio), clock, and synchronization signals onto a single differential wire pair. A2B supports a direct point-to-point connection and allows multiple, daisy-chained nodes at different locations to contribute and/or consume time division multiplexed channel content.

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

The transceiver can connect directly to general-purpose digital signal processors (DSPs), field-programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), microphones, analog-to-digital converters (ADCs), digital-to-analog converters (DACs), and codecs through a multichannel I2S/TDM interface. It also provides a PDM interface for direct connection of up to four PDM digital microphones.

Finally, the transceiver also supports an A2B bus powering feature, where the master node supplies voltage and current to the slave nodes over the same daisy-chained, twisted pair wire cable as used for the communication link, thus eliminating the need for a power supply on bus-powered slave nodes.

Table 1. Product Comparison Guide
Feature AD2420(W) AD2426(W) AD2427(W) AD2428(W) AD2420(W)
Master/Slave Capability Slave Slave Slave Both Master
Functional TRX blocks A only A only A + B A + B B only
I2S/TDM support No No No Yes Yes
PDM microphone inputs 2 mics 4 mics 4 mics 4 mics 4 mics
# of Slaves Supported N/A N/A N/A Up to 10 Up to 2
Max node to node cable length 5 m 15 m 15 m 15 m 5 m

Please contact your local ADI sales office or authorized ADI product distributor to receive additional product information and technical support.

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Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits (5)

Tools & Simulations

Software Development Kit

A2B Software for Windows/Baremetal Current Release

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.