Transceivers offer tailormade performance for EMC needs in automotive audio

Three enhanced Automotive Audio Bus (A2B) transceivers from Analog Devices can tailor system-level performance to even the most stringent electromagnetic compatibility (EMC) requirements, claims the company.

The AD242x series offers configurable transmit power levels, enabling the developer to match system performance to specific OEM EMC requirements. This is a key design criterion for all feature-rich automotive infotainment systems, says the company.

The transceivers also allow expanded use cases for microphone connectivity and reduce cabling complexity by distributing audio and control data plus clock and power over a single, unshielded twisted-pair wire. These attributes contribute to a lower system cost and are designed for emerging multi-mic applications such as road noise cancellation, in-car communications, and autonomous driving.

The three transceivers are the AD2426W, AD2427W and AD2428W, and all three are pin-compatible with existing series members, for ease of upgrading and to speed time to market.

A2B technology offers a deterministic, scalable and cost-effective means to address the rigorous performance requirements of next generation, latency-sensitive audio and voice applications, explains Analog Devices. The most recent generation of pin-compatible A2B transceivers extends the core A2B feature set to include additional features for system-level flexibility, particularly in microphone array applications. These three transceivers are capable of routing data from up to four PDM microphones to the local I2S port for beam-forming or other local data processing.  Further enhancements to the AD242x now allow for concurrently receiving up to four PDM mic inputs and an additional I2S audio stream, addressing advanced mic connectivity use cases.     

The AD2426W, AD2427W and AD2428W are 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).

The AD242x devices are in production now in a 32-lead LFCSP (5.0 x 5.0mm) package. Together with all previously released A2B series members, they are supported within ADI’s SigmaStudio graphical development environment and an extensive ecosystem of third party development, prototyping, and evaluation solutions.

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