AD2428WCCSZ-RL

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 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-toanalog converters (DACs), and codecs 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 fo

Applications

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

Key features

• Line topology Single master, multiple slave Up to 15 m between nodes and up to 40 m overall cabl 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
• 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