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wireless
communications
products
Silicon Germanium CDMA Transmit/Dual PLL RFlC
CX74002
Conexant Delivers RF Chipsets for 2G and 3G CDMA Applications
The CX74002 device offers the highest level of integration a trimode, 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 oscillator; and a variable gain amplifier (VGA), which is required in CDMA systems to provide linear variable output power at the antenna.
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 90 dB dynamic range * Variable-gain RF block to meet in-band signalto -noise ratio (SNR) * 6mm x 6mm land grid array (LGA) chipscale package
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.
features
and
specifications
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.
Further Information literature@conexant.com (800) 854-8099 (North America) (949) 483-6996 (International) Order # 101066A 00-0880 Wireless Communications Printed in USA
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
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
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
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
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 continuous 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 lowerfrequency operation
* Fully programmable PLL dividers * Selectable charge-pump currents for multiVCO applications controlled via serial bus interface
Applications
* cdmaOne, cdma2000 and AMPS modes in the following bands: - U.S. cellular - Japan cellular - U.S. PC S - Korea PCS * WCDMA in the IMT-2000 band
Europe
Europe Central - Germany Phone: +49 89 829 -1320 Fax: +49 89 834-2734
Conexant and the Conexant symbol are trademarks of Conexant Systems, Inc.
www.conexant.com

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