Automotive Audio Bus A2B Transceiver AD2401/AD2402/AD2403/AD2410 A2B BUS FEATURES GENERAL DESCRIPTION Line topology Single master, multiple slave Up to 10 meters between nodes and Up to 40 meters overall cable length Communication over distance Synchronous data Multichannel I2S/TDM to I2S/TDM Clock synchronous, phase aligned in all nodes Control and status Information I2C to I2C Phantom power or local power slave nodes Configurable with SigmaStudioTM graphical software tool Qualified for Automotive Applications The Automotive Audio Bus (A2BTM) provides a multi-channel, I2S/TDM link over distances of up to 10 meters between nodes. It embeds bi-directional synchronous data (for example digital audio), clock and synchronization signals onto a single differential wire pair. A2B supports a direct point-to-point connection and allows multiple, daisy chained nodes at different locations to contribute or consume time division multiplexed channel content. A2B is a single-master, multiple-slave system where the transceiver chip at the host controller is the master. It generates clock, synchronization and framing for all slave nodes. The master A2B chip is programmable over a control bus (I2C) for configuration and read back. An extension of this control bus is embedded in the A2B data stream allowing direct access of registers and status information on slave transceivers as well as I2C-to-I2C communication over distance. ADDITIONAL TRANSCEIVER FEATURES Configurable as A2B bus master or slave (AD2403/AD2410) I2C Interface 8-bit to 32-bit multichannel I2S/TDM interface Up to 32 upstream channels or combination with up to 32 downstream channels I2S/TDM or PDM Microphone inputs Automotive audio communication link Communication network for: Microphones/speakers Sensor/actuator I2C Peripherals IOVDD DVDD I2C BCLK SYNC DTX[1:0] DRX[1:0] I2S/TDM PDM PLLVDD PLL VOUT1 VIN VREG1 VOUT2 VREG2 AD2401 No A only No 4 Mics 10 m A2B TRX B ™ DIAGNOSTICS A2B TRX A (Towards Master) VSS A2B and the A2B logo are trademarks of Analog Devices, Inc. AD2402 No A+B No 4 Mics 10 m AD2403 Yes A+B Yes None 1m AD2410 Yes A+B Yes 4 Mics 10 m A/BTRXVDD (Towards Last Slave) MSTR Rev. SpB Table 1. Product Comparison Guide Feature Master Capable Functional TRX Blocks I2S/TDM Support PDM Microphone Inputs Maximum Node-to-Node Cable Length APPLICATIONS SCL SDA IRQ/IO0 ADR1/IO1 ADR2/IO2 Complete technical specifications are available for the A2B transceiver. Contact your nearest Analog Devices sales office to complete the Non-Disclosure Agreement (NDA) required to receive additional product information BP BCM BN SWP SENSE AP ACM AN VSSN Figure 1. Functional Block Diagram Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106 U.S.A. Tel: 781.329.4700 ©2015 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com AD2401/AD2402/AD2403/AD2410 ©2015 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D12780F-0-5/15(SpB) Rev. SpB | Page 2 of 2 | May 2015