Analog Devices' ADAA245x series of A2B 2.0 Automotive Audio Bus transceivers is now in production. The key numbers: 98.3 Mbps full-duplex (4x over A2B 1.0), support for up to 119 upstream and downstream audio channels, and 62 microsecond deterministic latency. The ADAA2457 variant adds Ethernet data tunneling via an Open Alliance SPI (OASPI) interface, which is the interesting addition for anyone building mixed audio-and-data ECU architectures.
The backward compatibility story is the practical win here. A2B 2.0 runs on existing A2B 1.0 cable and connector infrastructure, which means OEMs with deployed wire harness designs do not need to re-engineer physical routing to get the bandwidth upgrade. In automotive, where harness cost and validation cycles are real constraints, that matters more than the headline bandwidth number. The ADAA2455 operates as a sub-node only, while the ADAA2456 and ADAA2457 can be configured as main or sub-nodes, giving system designers flexible topology options.
ADI claims up to 30% system cost reduction through increased functional integration and reduced external component count. That claim warrants scrutiny -- 30% is a large number -- but the direction is right. Combining what previously required multiple discrete components (audio transceiver, protocol bridge, interface logic) into a single device with well-defined automotive qualification reduces both BOM cost and validation surface.
The OASPI Ethernet tunneling on the ADAA2457 is the feature to watch for next-generation zone architectures. As automotive compute consolidates toward zonal controllers, the ability to tunnel Ethernet traffic over an audio bus fabric could simplify wiring in mixed-signal zones where running a separate Ethernet harness is impractical. Whether that capability gets designed in broadly or treated as a niche feature depends on how zone controller architectures evolve over the next design cycle.