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Conexant logo are 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.

08-2742

Embeded Dial-Up Modems

Controller-Based Modems

CX81801 Features

General Modem Features

• Data modem

functions (V.92 models)

- ITU-T V.92, V.90 (V.92 models), V.34 (V.92 and V.34 models),

V.32bis, V.32, V.22bis, V.22, V.23, and V.21; Bell 212A and Bell 103

- V.250 and V.251 commands

• FastPOS (V.29) and V.22 fast connect

• Data compression and error correction

- V.44 data compression

- V.42bis and MNP 5 data compression

- V.42 LAPM and MNP 2-4 error correction

• Fax modem send and receive rates up to 14.4 kbps

- V.17, V.29, V.27 ter, and V.21 channel 2

- EIA/TIA 578 Class 1 and T.31 Class 1.0

• V.80 synchronous access mode supports host-controlled

communication protocols with H.324 interface support

• Data/Fax/Voice call discrimination

• Worldwide operation

- Complies to TBR21 and other country requirements

- Caller ID detection for many countries

- Call progress, blacklisting

- Internal ROM includes default values for 29 countries

- Additional modified country profiles can be stored in internal SRAM

(all CX81801) or optional serial EEPROM (128-pin TQFP only)

• Caller ID detect

- On-hook Caller ID detection

- Off-hook Call Waiting Caller ID detection during data mode in V.92,

V.90, V.34, V.32bis, and V.32

• Distinctive ring detect

• Telephony/TAM

- V.253 commands

- 2-bit and 4-bit Conexant ADPCM, 8-bit linear PCM, and 4-bit IMA coding

- 8 kHz sample rate

- Concurrent DTMF, ring, and Caller ID detection

• Direct mode (serial DTE interface)

• Flow control and speed buffering

• Automatic format/speed sensing

• +3.3V operation with +5V tolerant digital inputs

General Modem Features (28-pin CTLGA only)

• Built-in host/DTE interface

- Serial ITU-T V.24 (EIA/TIA-232-E) logical interface up to 115.2 kbps

• Serial async/sync data

• Thin packages support low profile designs (1.0 mm max. height)

- CX81801 modem in 28-pin CTLGA

- CX20493 LSD in 28-pin QFN

• Typical power use

- 220 mW (Normal Mode); 56 mW (Sleep Mode)

General Modem Features (128-pin TQFP only)

• Interfaces to optional external ROM/flash ROM, RAM,

and/or optional serial EEPROM

- Supports custom firmware

• Modem customization available through patch code that

can be stored in optional serial EEPROM or internal SRAM

• Full-duplex speakerphone (FDSP) mode using optional CX20442

Voice Codec (S models)

- Microphone and speaker interface

- Telephone handset or headset interface

- Acoustic and line echo cancellation

- Microphone gain and muting

- Speaker volume control and muting

• Built-in host/DTE interface

- Serial ITU-T V.24 (EIA/TIA-232-E) logical interface up to 115.2 kbps

- Parallel 16550A UART-compatible interface up to 230.4 kbps

• Serial async/sync data; parallel async data

• Thin packages support low profile designs (1.6 mm max. height)

- CX81801 modem in 128-pin TQFP

- CX20493 LSD in 28-pin QFN or 20463 LSD in 32-pin TQFP

- CX20442 VC in 32-pin TQFP

• Typical power use

- CX81801 and CX20493: 220 mW (Normal Mode); 56 mW (Sleep Mode)

- CX81801 and 20463: 220 mW (Normal Mode); 56 mW (Sleep Mode)

- CX20442: 5 mW (Normal Mode)

SmartDAA Features

• System side powered DAA operates under poor line current

supply conditions

• Modem Wake-on-Ring

• Ring detection

• Line polarity reversal detection

• Line current loss detection

• Pulse dialing

• Line-in-use detection during on-hook operation

• Remote hang-up detection for efficient call termination

• Extension pickup detection

• Call waiting detection

• Digital PBX line protection

• Meets worldwide DC masks requirements

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General Information:

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International: (949) 483-6996

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4311 Jamboree Rd, P.O. Box C

Newport Beach, CA 92660-3095

Doc# PBR-200311

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; digital set-top box components and systems solutions; and IEEE 802.11a/b/g/n-compliant WLAN

chipsets. 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.