Transceivers increase automotive audio bus bandwidth

Three enhanced Automotive Audio Bus (A2B) transceivers from Analog Devices distribute audio and control data and clock and power over a single, unshielded twisted-pair (UTP) cable.

The AD242x series of A2B transceivers offers slave-to-slave communication and support for reduced data-sampling rates. Both features significantly improve overall bus-bandwidth utilization says the company, and are key differentiators for emerging applications such as in-car communications and active noise cancellation.

The AD2421, AD2422, and AD2425 transceivers a are pin-compatible with existing series members. They include new features designed to increase system-level performance and ease of use. They include an improved pulse density modulation (PDM) block that is critical for next-generation microphone connectivity applications. They also have enhanced GPIO, I2C, and clocking capability for system-level flexibility. The AD242x devices can support daisy-chain configurations for up to 11 total nodes, while increasing the maximum internode distance to 15m.

The transceivers are fully compliant with all relevant automotive EMC, EMI, and ESD requirements, and are AEC-Q100 qualified. They operate over the extended automotive temperature range (-40 to +105 degree C).  They are available now in 32-lead LFCSP packages. Master and slave evaluation boards, local- and phantom-powered evaluation boards are currently available.


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