© 2007 Conexant Systems, Inc. All Rights Reserved. Conexant and the Conexant

logo are registered trademarks of Conexant Systems, Inc. All other trademarks

are owned by their respective owners. Although Conexant strives for accuracy

in all its publications, this material may contain errors or omissions and is

ANy ExPrESS or iMPliED wArrANTiES, iNclUDiNg MErchANTAbiliTy, fiTNESS for A

PArTicUlAr PUrPoSE AND NoN-iNfriNgEMENT.

Conexant shall not be liable for any

special, indirect, incidental or consequential damages as a result of its use.

Ordering Information

Marketing Name

Modem

SmartDAA®

ordering Number

V.22bis Modem

CX90240

CX20548-11Z

DS22-CSM-11Z

Evaluation Board

RD02-D390-5xx

Data Sheet and Design Guide

Doc# 201394

AT Command Manual

Doc# 102000

Serial

Interface

DTE/Host

Inerface

MCU/DSP

SmartDAA

Interface

Digital

Isolation

Barrier (DIB)

Telephone

Line

Interface

Codec

Line Side

DIB

Interface

(LSDI)

CX90240 Modem

28-Pin QFN

CX20548

SmartDAA 4

Line Side Device (LSD)

16-Pin QFN

DAA Hardware

Telephone

Line

Tip

Ring

RAM

ROM

28.224 MHz

or

27.000 MHz

Crystal or Clock

Source

Optional

NVRAM

External

Discrete

Components

CX90240 V.222bis Modem Simplified Interface

07-2715

Embedded Dial-Up Modems

V.22bis Applications

www.conexant.com

General Information:

U.S. and Canada: (888) 855-4562

International: 1+ (949) 483-3000

Headquarters

4000 MacArthur Blvd.

Newport Beach, CA 92660

Doc# PBR-201395

Conexant Product Portfolio

The company’s broad portfolio of semiconductor products also includes client-side DSL, cable, and dial-up modem solutions; fiber optic system-on-

chips; broadcast video encoders and decoders; and digital set-top box components and systems solutions. Additional products include a complete line

of asymmetric and symmetric DSL central office solutions, which are used by service providers worldwide to deliver broadband data, voice, and video

over copper telephone lines.