ADI AD2420WCCPZ01

The Automotive Audio Bus (A²B) provides a multichannel, I²S/TDM link over distances of up to 15m between nodes. It embeds bidirectional synchronous pulse - code modulation (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, daisychained nodes at different locations to contribute and/or consume time division multiplexed (TDM) channel content. A²B is a single - master, multiple - slave system where the transceiver at the host controller is the master. The master generates clock, synchronization, and framing for all slave nodes. The master A²B transceiver is programmable over a control port (I²C) for configuration and read back. An extension of the control port protocol is embedded in the A²B data stream, which grants direct access of registers and status information on slave transceivers as well as 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 codes through a multichannel I²S/TDM interface. It also provides a pulse density modulation (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.

• Line topology:
  • Single master, multiple slave
  • Up to 15m between nodes and up to 40m overall cable length
  • Communication over distance
  • Synchronous data
  • Multichannel I²S/TDM to I²S/TDM
  • Synchronous clock, phase aligned in all nodes
  • Low latency slave to slave communication
  • Control and status information I²C to I²C
  • GPIO and interrupt
  • Bus power or local power slave nodes
  • Configurable with SigmaStudio graphical software tool
  • AEC - Q100 qualified for automotive applications
• A²B TRANSCEIVER FEATURES:
  • Configurable A²B bus master or slave operation
  • I²C interface
  • 8 - bit to 32 - bit multichannel I²S/TDM interface
  • Programmable I²S/TDM data rate
  • Up to 32 upstream and 32 downstream channels
  • PDM interface
  • Programmable PDM clock rate
  • Up to 4 high dynamic range microphone inputs
  • Simultaneous reception of I²S data with up to 4 PDM microphones
  • Unique ID register for each transceiver
  • Crossover or straight - through cabling
  • Programmable settings to optimize EMC performance

• Audio communication link
• Microphone arrays
• Beamforming
• Hands free and in car communication
• Active and road noise cancellation
• Audio/video conferencing systems