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CX74002

ETC
Part Number CX74002
Manufacturer ETC
Description Silicon Germanium CDMA Transmit/Dual PLL RFlC
Published Jun 5, 2005
Detailed Description wireless communications products Silicon Germanium CDMA Transmit/Dual PLL RFlC CX74002 Conexant Delivers RF Chipsets ...
Datasheet PDF File CX74002 PDF File

CX74002
CX74002

Overview
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 ou...


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