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AD242x A²B® Audio Bus Transceiver

Analog Devices' transceiver embeds bidirectional synchronous data, clock, control data, and power onto a differential wire pair

Image of Analog Devices' AD242x A²B TransceiverAnalog Devices' A²B Automotive Audio Bus® technology provides a multichannel, I2S/TDM link over distances of up to 15 meters between nodes. It embeds bidirectional synchronous data, clock, control data, and 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 at the host controller is the master. It generates clock, synchronization, and framing for all slave nodes, resulting in a fully synchronous distributed audio system with deterministic sub-50µs latency. The master A2B transceiver is programmable over a control bus (I2C) for configuration and readback. 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.

A2B Bus Features
  • Line topology
    • Single master, multiple slaves
    • Up to 15 m between nodes and up to 40 m overall cable length
  • Communication over distance
    • Synchronous data
      • Multichannel I2S/TDM to I2S/TDM
      • Clock synchronous, phase-aligned in all nodes
      • Low-latency slave to slave communication
    • Control and status information I2C to I2C
    • GPIO over distance
  • Bus power or local power slave nodes
  • Configurable with SigmaStudio® graphical software tool
A2B Transceiver Features
  • A2B bus master (supporting up to ten slaves)
  • I2C interface
  • 8-bit to 32-bit multichannel I2S/TDM interface
    • I2S/TDM programmable data rate
    • Up to 32 upstream and 32 downstream channels
  • PDM interface
    • Supports four high dynamic range microphone inputs
    • Programmable sampling rate
    • Performs 24-bit PCM demodulation
  • Support for receiving I2S data on nodes with up to four PDM microphones
  • Unique ID register for each transceiver
  • Support for crossover or straight-through cabling
  • Programmable settings to optimize EMC performance
Applications
  • Road noise cancellation (RNC)
  • Microphone arrays for hands-free, in-car communications and eCall systems
  • Ethernet extension to mic/speaker/sensor edge devices
  • Teleconferencing systems
  • Small stage and studio audio equipment
  • Audio ECU communication links
  • Active noise cancellation (ANC)

AD242x A²B® Audio Bus Transceiver

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
AD2420AD2420BCPZAD2420490 - ImmediateView Details
LOW COST AUDIO BUS SLAVE REV 0.1AD2420WCCPZ01LOW COST AUDIO BUS SLAVE REV 0.1490 - ImmediateView Details
AUDIO A2B TRANSCEIVR 1CH 32LFCSPAD2426BCPZAUDIO A2B TRANSCEIVR 1CH 32LFCSP100 - ImmediateView Details
AUDIO A2B TRANSCEIVR 1CH 32LFCSPAD2426WCCSZAUDIO A2B TRANSCEIVR 1CH 32LFCSP167 - ImmediateView Details
AUDIO A2B TRANSCEIVR 1CH 32LFCSPAD2427BCPZAUDIO A2B TRANSCEIVR 1CH 32LFCSP100 - ImmediateView Details
AUDIO A2B TRANSCEIVR 1CH 32LFCSPAD2427WCCSZAUDIO A2B TRANSCEIVR 1CH 32LFCSP106 - ImmediateView Details
AUDIO A2B TRANSCEIVR 1CH 32LFCSPAD2428BCPZAUDIO A2B TRANSCEIVR 1CH 32LFCSP450 - ImmediateView Details
AUDIO A2B TRANSCEIVR 1CH 32LFCSPAD2428WCCSZ-RLAUDIO A2B TRANSCEIVR 1CH 32LFCSP2434 - ImmediateView Details
AUDIO A2B TRANSCEIVR 1CH 32LFCSPAD2429BCPZAUDIO A2B TRANSCEIVR 1CH 32LFCSP100 - ImmediateView Details
AUDIO A2B TRANSCEIVR 1CH 32LFCSPAD2429WCCPZ01AUDIO A2B TRANSCEIVR 1CH 32LFCSP100 - ImmediateView Details

Evaluation Boards

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
A2B BUS-POWER SLAVE 4XPDM BDEVAL-AD2428WC1BZA2B BUS-POWER SLAVE 4XPDM BD20 - ImmediateView Details
A2B BUS-POWER SLAVE I2S/2XPDM BDEVAL-AD2428WB1BZA2B BUS-POWER SLAVE I2S/2XPDM BD40 - ImmediateView Details
A2B LOCAL-POWER SLAVE I2S BDEVAL-AD2428WG1BZA2B LOCAL-POWER SLAVE I2S BD37 - ImmediateView Details
A2B MASTER/LOCAL-POWER SLAVE BDEVAL-AD2428WD1BZA2B MASTER/LOCAL-POWER SLAVE BD14 - ImmediateView Details
Updated: 2020-06-11
Published: 2020-01-16