Data Sheet



AD2421W/AD2422W/AD2425W

Rev. SpB

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A2B BUS FEATURES

Line topology

Single master, multiple slave

Up to 15 m between nodes and up to 40 m overall cable

length

Communication over distance

Synchronous data

Multichannel I

Clock synchronous, phase aligned in all nodes

Low latency slave to slave communication

Control and status information I

GPIO over distance

Phantom power or local power slave nodes

Configurable with SigmaStudio graphical software tool

Qualified for automotive applications

ADDITIONAL TRANSCEIVER FEATURES

Configurable as A

I

8-bit to 32-bit multichannel I

I

Up to 32 upstream and 32 downstream channels

PDM inputs for 4 high dynamic range microphones

APPLICATIONS

Automotive audio communication link

Active noise cancellation

Microphone arrays for hands free and in car communication

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. The master

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

for configuration and read back. An extension of this control

access of registers and status information on slave transceivers

Table 1. Product Comparison Guide

Feature

AD2421W AD2422W AD2425W

Master capable

No

No

Yes

Functional TRX blocks

A only

A + B

A + B

I

No

No

Yes

PDM microphone inputs

4 mics

4 mics

4 mics

Maximum node to node



cable length

15 m

15 m

15 m

A2B

TRX B

(Towards

Master)

VREG1

I2C

PLL

BCLK

DTX0/DTX1

IRQ/IO0

DRX0/DRX1

SYNC

SDA

SCL

ADR1/IO1/CLKOUT1

IOVDD

A2B

TRX A

(Towards

Last Slave)

BCM

AP

ACM

BN

DVDD

ATRXVDD/BTRXVDD

PLLVDD

VSS

SWP

VIN

VOUT1

ADR2/IO2/CLKOUT2

VREG2

VOUT2

VSSN

AN

BP

SENSE

DIAGNOSTICS

®

I2S/TDM

PDM

IO7

FUNCTIONAL BLOCK DIAGRAM