ETC CX74002

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
Distinguishing Features
I and Q outputs from the baseband analog processor and converts
them to intermediate frequency (IF) signals; a voltage controlled
• Best-in-class current consumption
oscillator (VCO) and very high-frequency (VHF) synthesizer to generate
• Tri-mode, dual-band functionality
the local oscillator (LO) signal for the quadrature demodulators for the
• I /Q to RF integration
cellular and PCS bands; a UHF synthesizer to control the UHF oscilla-
• Image-reject mixer
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.
• 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
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
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
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
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
Conexant and the Conexant symbol are trademarks of Conexant Systems, Inc.
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
www.conexant.com