A2B BUS FEATURES
Line topology
Single main node, up to 16 subordinate nodes
Up to 15 m between nodes and up to 80 m overall cable
length
Communication over distance
Synchronous data
Multichannel I2S/TDM to I2S/TDM
Clock synchronous, phase aligned in all nodes
Low latency node to node communication
Control and status information I2C to I2C
GPIO over distance
Bus power or local power subordinate nodes
Configurable with SIgmaStudio/SigmaStudio+ graphical
software tool
AEC-Q100 qualified for automotive applications
BASELINE A2B TRANSCEIVER FEATURES
Configurable as A2B bus main node or subordinate node
Programmable via I2C and SPI interfaces
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 main
or subordinate nodes
Simultaneous I2S/TDM operations 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

AD243x TRANSCEIVER ENHANCEMENTS
Mixed Signal
Up to 50 W A2B bus power
Increased voltage regulator capacity (up to 100 mA)
ADC monitoring of supply voltages
Supports 3.3 V input at VIN in Low Voltage Input (LVI)
mode
Digital
High speed SPI (up to 10 Mbps) over distance
A2B bus self-discovery
Dedicated hardware reset pin
I2S/TDM crossbar switch
Flexible mapping of Tx/Rx TDM channel data to A2B slot
Support for I2C fast mode plus (1 MHz)
Support for in cabin LED control using 4 PWM outputs
8 GPIO pins with configurable pin mapping

APPLICATIONS
Distributed audio systems
Personal audio zones
In car communications
Smart/remote tuner modules