Automotive Audio Bus

AD2401/AD2402/AD2403/AD2410

Rev. SpE

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A2B BUS FEATURES

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

Clock synchronous, phase aligned in all nodes

Control and status Information

Phantom power or local power slave nodes

Qualified for automotive applications

ADDITIONAL TRANSCEIVER FEATURES

Up to 32 upstream channels or combination with up to

32 downstream channels

APPLICATIONS

Automotive audio communication link

Communication network for:

Microphones/speakers

Sensor/actuator

GENERAL DESCRIPTION

embeds bidirectional synchronous data (for example digital

audio), clock, and synchronization signals onto a single differ-

and allows multiple, daisy-chained nodes at different locations

to contribute or consume time division multiplexed channel

transceiver chip at the host controller is the master. It generates

clock, synchronization, and framing for all slave nodes. The

configuration and read back. An extension of this control bus is

ters and status information on slave transceivers as well as 

transceiver. Contact your nearest Analog Devices sales office to

complete the nondisclosure agreement (NDA) required to

receive additional product information

.

Table 1. Product Comparison Guide

Feature

AD2401 AD2402 AD2403 AD2410

Master capable

No

No

Yes

Yes

Functional TRX blocks

A only

A + B

A + B

A + B

No

No

Yes

Yes

PDM microphone inputs

4 Mics

4 Mics

None

4 Mics

Maximum node to node

cable length

10 m

10 m

1 m

10 m

Figure 1. Functional Block Diagram

A2B

TRX B

(Towards

Master)

VREG1

PLL

BCLK

DTX[1:0]

IRQ/IO0

DRX[1:0]

SYNC

SDA

SCL

ADR1/IO1

MSTR

IOVDD

A2B

TRX A

(Towards

Last Slave)

BCM

AP

ACM

BN

DVDD

A/BTRXVDD

PLLVDD

VSS

SWP

VIN

VOUT1

ADR2/IO2

VREG2

VOUT2

VSSN

AN

BP

SENSE

DIAGNOSTICS

I2S/TDM

PDM

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