The Automotive Audio Bus (A²B™) provides a multi-channel, I²S/TDM link over distances of up to 10 meters between nodes and up to 40m end-to-end. It embeds bi-directional synchronous data (for example digital audio), I²C control, clock and synchronization signals, and phantom power 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 or consume time division multiplexed channel content. A²B is a single-master, multiple-slave system where the transceiver chip at the host controller is the master. It generates clock, synchronization and framing for all slave nodes. The master A²B chip 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 allowing direct access of registers and status information on slave transceivers as well as I²C-to-I²C communication over distance.

Applications

• Audio communication link
• Conference room microphone/speakers 
• Professional audio equipment interconnect 
• Board-to-board interconnect (ribbon cable replacement where multiple I²S are needed)
• Communication network for:
  
  • Microphones/ speakers
  • Sensor/actuator
  • I²C Peripherals

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.