Embeded Dial-Up Modems
Controller-Based Modems
Serial/Parallel Modem with 3rd Generation
SmartDAA and Speakerphone Support
Controller-Based Modem with SmartDAA® 3
for Embedded Applications
Conexant’s broadband communications portfolio includes a comprehensive suite
of semiconductor solutions that enable the digital home and information network.
The Conexant CX81801 modem is ideal for embedded applications such as POS
Terminals, Set-Top Boxes, Video Recorders, Metering, Security, Remote Site
Management and any other application that requires robust dial-up connectivity.
The device set integrates the micro controller, digital signal processor, memory and a
worldwide DAA/telephone line interface function that operates with PSTN telephone
lines worldwide.
The CX81801 modem supports data/fax/Telephone Answering Machine (TAM)
with up to 56 kbps analog data and 14.4 kbps fax modem operation. The V.92 modem
includes V.92 features such as Quick Connect, Modem-on-Hold™ and
PCM Upstream. The modem device is also available in V.34 and V.32bis options.
The CX81801 modem device set consists of a CX81801 modem in either a 128-pin
TQFP or 28-pin CTLGA package, and a Line Side Device (LSD). The CX81801 128-pin
Distinguishing Features
TQFP supports either the SmartDAA 3 LSD (CX20493 28-pin QFN) or the SmartDAA
• V.92, V.34 and V.32bis options
- V.92 includes Modem-on-Hold™,
Quick Connect, and PCM Upstream
• Fax modem send and receive rates
up to 14.4 kbps
• FastPOS (V.29) and V.22 fast connect
• V.44/V.42bis and MNP5 data compression
• V.42 and MNP2-4 error correction
• 128-pin TQFP package available
- Serial or parallel interface
- Optional full-duplex speakerphone
- SmartDAA 3 or SmartDAA option
• 28-pin CTLGA package available
- Serial interface
- Pin-compatible with CX84100 V.22bis modem
- Small form-factor
- SmartDAA 3
• SmartDAA 3
- Line-in-use detection
- Digital Line Guard (programmable)
- Extension Pick-up detection
- Remote Hang-up detection
• Worldwide support
• Quick time-to-market
• Low-cost solution
• Optional Pb-free devices available
(CX20463 32-pin TQFP). The SmartDAA 3 requires fewer discrete components for a
low-cost solution. The CX81801 128-pin TQFP supports serial and parallel interface and
optional full-duplex speakerphone. The CX81801 Modem in a 28-pin CTLGA supports
SmartDAA 3 LSD (CX20493 28-pin QFN). This device targets applications that require
the smallest possible dimensions. The CTLGA package has the same footprint as a
TSSOP package. The CX81801 28-pin CTLGA supports a serial interface.
Serial DTE
Host Bus
(128 TQFP
Smart Modem
28-pin CTlgA
128-Pin TQfP
(28-Pin QfN)
line Side Device
Line Interface
voice Codec (vC)
32-Pin TQfP
(optional for
128 TQfP only)
CX81801 Modem Block Diagram
Speaker (Optional)
Part Number CX81801
Description Serial/Parallel Modem with 3rd Generation SmartDAA and Speakerphone Support
Embeded Dial-Up Modems
Controller-Based Modems
CX81801 Features
General Modem Features
• Data modem
- Quick Connect, Modem-on-Hold™ and PCM Upstream
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 2
0463 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
• S
ystem 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
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-onchips; 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.
© 2004, Conexant Systems, Inc. All Rights Reserved. Conexant and the
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
subject to change without notice.
This material is provided AS IS and without
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.
General Information:
U.S. and Canada: (800) 854-8099
International: (949) 483-6996
Headquarters – Newport Beach
4311 Jamboree Rd, P.O. Box C
Newport Beach, CA 92660-3095
Doc# PBR-200311