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A²B BUS FEATURES

• Line topology
  • Single main node, up to 16 subordinate nodes
  • Up to 30 m between nodes and up to 300 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+ graphical software tool

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 51 channels of 16-bit data or 32 channels of 24-bit data between nodes
• PDM inputs for up to 4 high dynamic range microphones on main or subordinate nodes
• Support for receiving I²S/TDM and PDM data on the same node
• Unique ID register for each transceiver
• Support for crossover or straight-through cabling

AD2437 TRANSCEIVER ENHANCEMENTS

• Mixed Signal
  • 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
  • Dedic
    

    产品详情和应用

    
    

    The AD2437 A²B^® transceiver provides a multichannel, I²S/TDM link over distances of up to 30 m between nodes. It embeds bidirectional synchronous pulse-code modulation (PCM) data (for example, digital audio), clock, and synchronization signals onto a single-pair differential cable. A²B supports a direct point to point connection and allows multiple, daisy-chained nodes at different locations to contribute and/or consume time division multiplexed channel content.

    A²B is a single main node, multiple subordinate node system where the transceiver at the host controller is the main node. The main node generates clock, synchronization, and framing for all subordinate nodes. The main A²B transceiver is programmable over a control port (I²C/SPI) for configuration and read back. An extension of the control port protocol is embedded in the A²B data stream. This allows direct access to registers and status information on subordinate transceivers, as well as I²C to I²C, SPI to I²C, or SPI to SPI communication from the host to a peripheral in a subordinate node. SPI to SPI communication between subordinate nodes can be performed directly and does not need to involve the main node.

    The transceiver can connect directly to general-purpose digital signal processors (DSPs), field-programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), digital microphones, analog-to-digital converters (ADCs), digital-to-analog 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.

    The transceiver supports a bus power feature, where the main node supplies voltage and current to the subordinate nodes over the same daisy-chained, single-pair wi