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CX74001

CDMA Receive RFlC

Conexant Systems 

wireless communications products

CDMA Receive RFlC

CX74001

Conexant Delivers RF Chipsets

for 2G and 3G CDMA Applications

The CX74001 offers the highest level of integration in a tri-mode, dual-

band receiver (Rx) 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 CX74001 is also

designed to be suitable for wideband CDMA (WCDMA) applications

in the IMT-2000 band. Programmable linearity is included in the RF

front end to optimize power consumption at various input levels. A

three-step cellular LNA, bypass PCS LNA, and a seperate enable for

the internal VCO increases system performance and standby times.

The device is a highly integrated super-heterodyne receiver. It incor-

porates all the components required to implement the receiver front

end and the In-phase and Quadrature (I/Q) demodulator stages,

except for the filter blocks. It has two internal LNAs — one for the

cellular band and another for the PCS band.

The device also has separate mixers for the AMPS, CDMA and PCS

bands. The AMPS mixer has differential outputs that are combined

externally as a single-ended output for the intermediate frequency (IF)

surface acoustic wave (SAW) filter. The cellular and PCS mixers have

balanced outputs for the CDMA IF SAW filters. The mixers are fol-

lowed by an IF variable gain amplifier (VGA) and an I/Q demodulator.

The outputs from the filters are combined through separate buffers

at the input of the VGA. The buffers are enabled depending on the

selected mode. The VGA has a gain control range greater than 90 dB.

The device has two very high-frequency (VHF) oscillators that oper-

ate with external tank circuits. They provide signals to the local oscil-

lator (LO) for the I/Q demodulator in the cellular and PCS bands.

Distinguishing Features

• Tri-mode, dual-band functionality

• RF to I/Q integration

• Three battery-cell operation

(2.7V < VCC < 3.6V)

• PCS bypass LNA with NF 1.9 dB typical

• Three-step cellular LNA with NF 1.8 dB

typical at maximum gain

• Dual 200 to 600 MHz 2nd IF Oscillators

• 7mm x 7mm land grid array (LGA)

chipscale package

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