CX74002 - Conexant Systems, Inc.

wireless communications products

Distinguishing Features

• Best-in-class current consumption

• Tri-mode, dual-band functionality

• I/Q to RF integration

• Image-reject mixer

• Three battery-cell operation (2.7V < VCC < 3.6V)

• Split-band PCS drivers to improve Rx Band

noise performance

• Tx power control with 90dB dynamic range

• Variable-gain RF block to meet in-band signal-

to-noise ratio (SNR)

• 6mm x 6mm land grid array (LGA)

chipscale package

Silicon Germanium CDMA

Transmit/Dual PLL RFlC

Conexant Delivers RF Chipsets

for 2G and 3G CDMA Applications

The CX74002 device offers the highest level of integration a tri-

mode, dual-band CDMA transmit RFIC. The device is designed to

meet the needs of both 2G and 3G CDMA systems. Specifically

targeting the cdmaOne, cdma2000, and AMPS markets in the U.S.

and Korean cellular, Japan cellular, Korean PCS and U.S. PCS bands.

The CX74002 is also designed to be suitable for wideband CDMA

(WCDMA) applications in the IMT-2000 band. The device is built

using Conexant’s advanced silicon germanium (SiGe) bipolar

complementary metal oxide semiconductor (BiCMOS) process

technology. This process results in best-in-class current consumption

performance, hence increasing cellular phone talk time.

The CX74002 is a highly integrated super-heterodyne transmitter

(Tx) that incorporates all the active functional blocks up to the antenna:

an In-phase and Quadrature (I/Q) modulator that accepts the analog

I and Q outputs from the baseband analog processor and converts

them to intermediate frequency (IF) signals; a voltage controlled

oscillator (VCO) and very high-frequency (VHF) synthesizer to generate

the local oscillator (LO) signal for the quadrature demodulators for the

cellular and PCS bands; a UHF synthesizer to control the UHF oscilla-

tor; and a variable gain amplifier (VGA), which is required in CDMA

systems to provide linear variable output power at the antenna.

The output of the VGA is fed to the image reject mixer. The output

of the image reject mixer is fed directly to the PA pre-driver without

the need for external SAW filters, resulting in a reduction of overall

cellular phone bill-of-material cost.

CX74002

features and specifications

www.conexant.com

Further Information

literature@conexant.com

(800) 854-8099 (North America)

(949) 483-6996 (International)

Order # 101066A

00-0880

Wireless Communications

Printed in USA

World Headquarters

Conexant Systems, Inc.

4311 Jamboree Road

Newport Beach, CA

92660-3007

Phone: (949) 483-4600

Fax 1: (949) 483-4078

Fax 2: (949) 483-4391

Americas

U.S. Northwest – Santa Clara

Phone: (408) 249-9696

Fax: (408) 249 -7113

U.S. Southwest – Los Angeles

Phone: (805) 376-0559

Fax: (805) 376 - 8180

U.S. Southwest – Newport Beach

Phone: (949) 483-9119

Fax: (949) 483-9090

U.S. San Diego

Phone: (858) 713-4730

Fax: (858) 713-4008

U.S. North Central – Illinois

Phone: (630) 773-3454

Fax: (630) 773 -3907

U.S. South Central/Mexico

– Texas

Phone: (972) 871-1920

Fax: (972) 871-8910

U.S. Northeast – Massachusetts

Phone: (978) 367-3200

Fax: (978) 256 - 6868

U.S. Carolinas – North Carolina

Phone: (919) 858-9110

Fax: (919) 858 - 8669

U.S. Southeast/South America

– Florida

Phone: (727) 799-8406

Fax: (727) 799 - 8306

U.S. Mid-Atlantic – Pennsylvania

Phone: (215) 244-6784

Fax: (215) 244-9292

Canada – Ontario

Phone: (613) 271-2358

Fax: (613) 271-2359

Europe

Europe Central – Germany

Phone: +49 89 829-1320

Fax: +49 89 834-2734

Europe North – England

Phone: +44 1344 486444

Fax: +44 1344 486555

Europe – Israel/Greece

Phone: +972 9 9524000

Fax: +972 9 9573732

Europe South – France

Phone: +33 1 41 44 36 51

Fax: +33 1 41 44 36 90

Europe Mediterranean – Italy

Phone: +39 02 93179911

Fax: +39 02 93179913

Europe – Sweden

Phone: +46 (0) 8 5091 4319

Fax: +46 (0) 8 590 041 10

Europe – Finland

Phone: +358 (0) 9 85 666 435

Fax: +358 (0) 9 85 666 220

Asia Pacific

Taiwan

Phone: (886-2) 2-720-0282

Fax: (886 -2) 2-757-6760

Australia

Phone: (61-2) 9869 4088

Fax: (61-2) 9869 4077

China – Central

Phone: 86-21-6361-2515

Fax: 86-21-6361-2516

China – South

Phone: (852) 2 827-0181

Fax: (852) 2 827- 6488

China – South (Satellite)

Phone: (86) 755-5182495

Fax: (86 ) 755 -5183024

China – North

Phone: (86-10) 8529- 9777

Fax: (86 -10) 8529 -9778

India

Phone: (91-11) 692-4789

Fax: (91-11) 692 -4712

Korea

Phone: (82-2) 565-2880

Fax: (82-2) 565-1440

Korea (Satellite)

Phone: (82-53) 745-2880

Fax: (82-53) 745-1440

Singapore

Phone: (65) 737 7355

Fax: (65) 737 9077

Japan

Phone: (81-3) 5371 1520

Fax: (81-3) 5371 1501

CX74002 Tx ASIC block diagram

Package dimensions — 40-pin 6mm x 6mm LGA package

Product Features

• Image reject upconverter saves two

RF surface acoustic waves (SAWs) filters

in dual-band applications

• Driver gain can be changed either by a con-

tinuous signal or by a step signal through

the driver gain control signal

• 100-800 MHz oscillator (external tank)

• VCO_ON feature to increase the talk time of

the radio

• Two separate phase lock loop (PLL) synthesizers

• Dual-loop multiband operation

• Power-save mode for both standby and lower-

frequency operation

• Fully programmable PLL dividers

• Selectable charge–pump currents for multi-

VCO applications controlled via serial bus

interface

Applications

•cdmaOne, cdma2000 and AMPS modes in the

following bands:

–U.S. cellular

–Japan cellular

–U.S. PCS

–Korea PCS

•WCDMA in the IMT-2000 band

Conexant and the Conexant symbol are trademarks of Conexant Systems, Inc.

The CX74002, along with Conexant’s CX74001 receive RFIC, a Conexant

power amplifier module, and Conexant’s baseband analog processor forms

a complete RF subsystem that interfaces with the most common cdma

baseband devices.