ADAA2455

The Automotive Audio Bus A²B^®2.0 transceivers (ADAA245x) quadruple the available bus bandwidth relative to existing A²B 1.01 devices making them particularly well suited for high definition (HD) audio transport in ECU connectivity applications. ADAA245x devices are compatible with existing A²B 1.0 cabling/connector infrastructures and fully supported by SigmaStudio+®, a unified software framework from Analog Devices. Additionally, the ADAA245x family and future A²B 2.0 devices can easily be connected to A²B 1.0 branches using their integrated, industry-standard I²S, I²C, and SPI interfaces.A²B provides a multichannel, multistream digital audio link over distances of up to 15 m between nodes. It embeds bidirectional synchronous pulse code modulation (PCM) data (for example, digital audio from I²S/TDM interface), clock, and synchronization signals, as well as asynchronous data (for example, Ethernet packets) onto a single differential wire pair. A²B supports a direct point to point connection or line topology with multiple, daisy-chained nodes at different locations that can contribute and/or use time division multiplexed channel content.A²B is a single main node, multiple subordinate node system where the transceiver at the host controller is part of the main node. The main node generates clock, synchronization, and framing for all subordinate nodes. The main A²B transceiver is programmable over a control bus (I²C or SPI) for configuration and read back. An extension of this control bus is embedded in the A²B data stream, which grants direct access to registers and status information on subordinate transceivers, as well as I²C to I²C, SPI to SPI, SPI to I²C and GPIO to GPIO communication over distance.The transceiver can connect directly to general-purpose digital signal processors (DSPs) or microprocessors, field-programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), microphones, accelerometers, 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’s pulse width modulated (PWM) outputs can control LED drivers or voltage regulators. GPIO status and control is directly conveyed between nodes.SoftwarePlease contact your local ADI sales representative to request the required A²B 2.0 software.