Automotive Audio Bus
A2B Transceiver
AD2401/AD2402/AD2403/AD2410
A2B BUS FEATURES
GENERAL DESCRIPTION
The Automotive Audio Bus (A2B®) provides a multichannel,
I2S/TDM link over distances of up to 10 m between nodes. It
embeds bidirectional synchronous data (for example digital
audio), clock, and synchronization signals onto a single differ-
ential 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 regis-
ters and status information on slave transceivers as well as
I2C to I2C communication over distance.
Line topology
Single master, multiple slave
Up to 10 m between nodes and up to 40 m 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
ADDITIONAL TRANSCEIVER FEATURES
Complete technical specifications are available for the A2B
transceiver. Contact your nearest Analog Devices sales office to
complete the nondisclosure agreement (NDA) required to
receive additional product information.
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
Table 1. Product Comparison Guide
I2S/TDM or PDM microphone inputs
Feature
AD2401 AD2402 AD2403 AD2410
APPLICATIONS
Master capable
Functional TRX blocks
I2S/TDM support
No
A only A + B
No No
No
Yes
Yes
Automotive audio communication link
Communication network for:
Microphones/speakers
Sensor/actuator
A + B
Yes
A + B
Yes
PDM microphone inputs 4 Mics 4 Mics None
4 Mics
10 m
I2C peripherals
Maximum node to node 10 m
cable length
10 m
1 m
IOVDD DVDD
PLLVDD
VOUT1 VIN VOUT2
A/BTRXVDD
2
SCL
SDA
A B
BP
PLL
VREG1 VREG2
TRX B
(Towards
Last Slave)
BCM
BN
I2C
IRQ/IO0
ADR1/IO1
®
SWP
SENSE
ADR2/IO2
DIAGNOSTICS
BCLK
SYNC
AP
2
A B
2
I S/TDM
PDM
ACM
AN
TRX A
(Towards
Master)
DTX[1:0]
DRX[1:0]
MSTR
VSSN
VSS
Figure 1. Functional Block Diagram
A2B and the A2B logo are registered trademarks of Analog Devices, Inc.
Rev. SpE
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
Technical Support
©2017 Analog Devices, Inc. All rights reserved.
www.analog.com
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