AD2428W datasheet(2/2 Pages) AD

2 / 2 page

Rev. Sp0

Page 2 of 2

May 2018

registered trademarks are the property of their respective owners.

D16813F-0-5/18(Sp0)

AD2426W/AD2427W/AD2428W

Data Sheet

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 differential wire pair. A2B supports a

direct point to point connection and allows multiple, daisy-

chained nodes at different locations to contribute and/or con-

sume time division multiplexed channel content.

A2B is a single-master, multiple-slave system where the trans-

ceiver chip at the host controller is the master. The master

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 con-

trol bus is embedded in the A2B data stream, which grants direct

access of registers and status information on slave transceivers

as well as I2C to I2C communication over distance.

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 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 master node supplies voltage and current to the

slave 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

AD2426W AD2427W AD2428W

Master capable

Yes

Functional TRX blocks

A only

A + B

2S/TDM support

Yes

PDM microphone inputs

4 mics

Max node to node cable length 15 m

15 m

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