Datasheet > CX74002

CX74002

更新时间： 2024-09-26 22:12:31

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描述
Silicon Germanium CDMA Transmit/Dual PLL RFlC

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数据手册

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CX74002 数据手册

w i r e l e s s c o m m u n i c a t i o n s p r o d u c t s

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 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

Distinguishing Features

I and Q outputs from the baseband analog processor and converts

• Best-in-class current consumption

• Tri-mode, dual-band functionality

• I/Q to RF integration

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.

• Image-reject mixer

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

• Split-band PCS drivers to improve Rx Band

noise performance

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.

• 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

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