Datasheet AD2401, AD2402, AD2403, AD2410 (Analog Devices)

Automotive Audio Bus A2B Transceiver AD2401/ AD2402/ AD2403/ AD2410 A2B BUS FEATURES GENERAL DESCRIPTION Line topology
The Automotive Audio Bus (A2B®) provides a multichannel,
Single master, multiple slave
I2S/TDM link over distances of up to 10 m between nodes. It
Up to 10 m between nodes and up to 40 m overall cable
embeds bidirectional synchronous data (for example digital
length
audio), clock, and synchronization signals onto a single differ-
Communication over distance
ential wire pair. A2B supports a direct point to point connection
Synchronous data
and allows multiple, daisy-chained nodes at different locations
Multichannel I2S/TDM to I2S/TDM
to contribute or consume time division multiplexed channel
Clock synchronous, phase aligned in all nodes
content. A2B is a single-master, multiple-slave system where the
Control and status Information
transceiver chip at the host controller is the master. It generates clock, synchronization, and framing for all slave nodes. The
I2C to I2C
master A2B chip is programmable over a control bus (I2C) for
Phantom power or local power slave nodes
configuration and read back. An extension of this control bus is
Configurable with SigmaStudioTM graphical software tool
embedded in the A2B data stream allowing direct access of regis-
Qualified for automotive applications
ters and status information on slave transceivers as well as 
ADDITIONAL TRANSCEIVER FEATURES
I2C to I2C communication over distance.
Configurable as A2B bus master or slave (AD2403/AD2410)
Complete technical specifications are available for the A2B
I2C interface
transceiver. Contact your nearest Analog Devices sales office to
8-bit to 32-bit multichannel I2S/TDM interface
complete the nondisclosure agreement (NDA) required to receive additional product information.
Up to 32 upstream channels or combination with up to 32 downstream channels Table 1. Product Comparison Guide I2S/TDM or PDM microphone inputs APPLICATIONS Feature AD2401 AD2402 AD2403 AD2410
Master capable No No Yes Yes
Automotive audio communication link Communication network for:
Functional TRX blocks A only A + B A + B A + B
Microphones/speakers
I2S/TDM support No No Yes Yes
Sensor/actuator
PDM microphone inputs 4 Mics 4 Mics None 4 Mics
I2C peripherals
Maximum node to node 10 m 10 m 1 m 10 m cable length
IOVDD DVDD PLLVDD VOUT1 VIN VOUT2 A/BTRXVDD SCL A2B BP SDA PLL VREG1 VREG2 TRX B BCM IRQ/IO0 I2C (Towards Last Slave) BN ADR1/IO1
®
SWP ADR2/IO2 DIAGNOSTICS SENSE BCLK AP SYNC A2B I2S/TDM TRX A ACM DTX[1:0] PDM (Towards AN Master) DRX[1:0] MSTR VSS VSSN
Figure 1. Functional Block Diagram A2B and the A2B logo are registered trademarks of Analog Devices, Inc.
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Document Outline Automotive Audio Bus A2B Transceiver A2B Bus Features Additional Transceiver Features Applications General Description