AD2431 datasheet(2/2 Pages) AD

2 / 2 page

Rev. SpA

Page 2 of 2

April 2022

AD2431/AD2432/AD2433/AD2435

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D25790F-4/22(SpA)

I2C refers to a communications protocol originally developed by Philips Semiconductors (now NXP Semiconductors).

GENERAL DESCRIPTION

The Automotive Audio Bus (A2B

®) provides a multichannel,

I2S/TDM link over distances of up to 15 m between nodes. It

embeds bidirectional synchronous pulse-code modulation

(PCM) data (for example, digital audio), clock, and synchroni-

zation signals onto a single unshielded twisted pair (UTP)

differential cable. A2B supports a direct point to point connec-

tion and allows multiple, daisy-chained nodes at different

locations to contribute and/or consume time division multi-

plexed channel content.

A2B is a single main node, multiple subordinate node system

where the transceiver at the host controller is the main node.

The main node generates clock, synchronization, and framing

for all subordinate nodes. The main A2B transceiver is program-

mable over a control port (I2C/SPI) for configuration and read

back. An extension of the control port protocol is embedded in

the A2B data stream. This allows direct access to registers and

status information on subordinate transceivers, as well as I2C to

I2C, SPI to I2C, or SPI to SPI communication from the host to a

peripheral in a subordinate node. SPI to SPI communication

between subordinate nodes can be performed directly and does

not need to involve the main node.

The transceiver can connect directly to general-purpose digital

signal processors (DSPs), field-programmable gate arrays

(FPGAs), application specific integrated circuits (ASICs),

microphones, analog-to-digital converters (ADCs), digital-to-

analog converters (DACs), and codecs through a multichannel

I2S/TDM interface. It also provides a pulse density modulation

(PDM) interface for direct connection of up to four PDM digital

microphones.

Finally, the transceiver also supports an A2B bus powering fea-

ture, where the main node supplies voltage and current to the

subordinate nodes over the same daisy-chained, twisted pair

wire cable as used for the communication link.

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.

Table 1. Product Comparison Guide

Feature

AD2431

AD2432

AD2433

AD2435

Main node capable

Yes

Functional TRX blocks

A only

A + B

2S/TDM support

Yes

PDM microphone inputs

4 mics

2B bus power

N/A

High (≤ 50 W)

Standard (≤ 2.7 W)

High (≤ 50 W)

Nominal bus bias voltage (VBUS)

7 V to 24 V

4 V to 9 V

7 V to 24 V

SPI

NoNoYes

Yes

Power configuration1

N/A

CFG-4

CFG-0

CFG-4

1 N/A means not applicable.

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