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The AD2438WCCPZY-RL Car Audio Bus (A2B®) provides a multi-channel I2S/TDM link at distances of up to 15 meters between nodes. It imparts bidirectional synchronous pulse-coded modulation (PCM) data (for example, digital audio), clock, and synchronization signals onto an unshielded twisted pair (UTP) differential cable. A2B supports direct point-to-point connections and allows multiple computer nodes to provide and/or use the content of time division multiplexing channels at different locations.

A2B is a single-master and multi-slave node system, where the transceiver on the primary controller is the primary transceiver. The master node generates clocks, synchronizations, and frames for all slave nodes. The main A2B transceiver chip is programmable via the control bus (I2C) for configuration and read-back.

Transceivers can be connected directly to general-purpose digital signal processors (DSPS) or microprocessors, field programmable gate arrays (FPGas), application-specific integrated circuits (ASics), microphones, analog-to-digital converters (ADCs), digital-to-analog converters (dac), and codecs via multi-channel I2S/TDM interfaces. It also provides a pulse density modulation (PDM) interface for direct connection to up to four PDM digital microphones. The pulse-width-modulation (PWM) output of the transceiver can control the LED driver or voltage regulator. GPIO state and control are passed directly between nodes.

Additionally, the transceiver also supports an A2B bus powering feature, where the main node supplies voltage and current to the subordinate nodes over the same daisy-chained, twisted pair wire cable as used for the communication link.

Applications：

Head-Unit and Cockpit ECU

Premium Audio Amplifiers

Telematics, eCall, and Networking

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