AD2427W Automotive Audio Bus A2B Transceiver

优势和特点

A²B BUS FEATURES

• Line topology
  • Single master, multiple slave
  • 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
• Qualified for automotive applications

A²B TRANSCEIVER FEATURES

• Configurable as A²B bus master or slave (AD2428W)
• I²C interface
• 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 masters or slaves
• Support for receiving I²S data on nodes 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

产品详情

The Automotive Audio Bus (A²B^®) provides a multichannel,I²S/TDM link over distances of up to 15 m between nodes. Itembeds bidirectional synchronous pulse-code modulation(PCM) data (for example, digital audio), clock, and synchronizationsignals onto a single differential wire pair. A²B supports adirect point to point connection and allows multiple, daisychainednodes at different locations to contribute and/or consumetime division multiplexed channel content.

A2B is a single-master, multiple-slave system where the transceiverchip at the host controller is the master. The mastergenerates clock, synchronization, and framing for all slavenodes. The master A²B chip is programmable over a control bus(I²C) for configuration and read back. An extension of this controlbus is embedded in the A²B data stream, which grants directaccess of registers and status information on slave transceiversas well as I²C to I²C communication over distance.

The transceiver can connect directly to general-purpose digitalsignal processors (DSPs), field-programmable gate arrays(FPGAs), application specific integrated circuits (ASICs),microphones, analog-to-digital converters (ADCs), digital-toanalogconverters (DACs), and codecs through a multichannelI²S/TDM interface. It also provides a PDM interface for directconnection 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 theslave nodes over the same daisy-chained, twisted pair wire cableas used for the communication link.

Complete technical specifications are available for the A²Btransceiver. Contact your nearest Analog Devices sales office tocomplete the nondisclosure agreement (NDA) required toreceive additional product information.

Applications

• Automotive audio communication link
• Active noise cancellation
• Microphone arrays for hands free and in car communication

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