CX74040 - Conexant Systems, Inc.

• Complete radio subsystem which

meets 3GPP R99 requirements for

WCDMA handsets

• High level of integration for

cost-effective solutions

• Low power consumption

• Supports IMT-2000 frequency band

wireless communications products

WCDMA RF Subsystem

Distinguishing Features

Conexant Delivers Highly Integrated

RF Chipset for WCDMA Applications

Conexant offers a complete highly-integrated RF chipset to

meet the needs of WCDMA terminal devices. The RF subsystem

is designed and optimized for use in WCDMA and UMTS

voice/data applications in the IMT-2000 frequency band. Conexant’s

WCDMA RF subsystem family includes Transmitter/Receiver (Tx/Rx)

RFICs, Fractional-N Synthesizer, and a Power Amplifier Module.

The WCDMA RF subsystem family, when combined with Conexant’s

GSM RF subsystem, provides a complete transmit and receive

solution for dual-mode, tri-band, GSM/UMTS Terminals. Whether

you plan to build a low-cost single-mode phone or a versatile

GSM/UMTS handset, Conexant gives you the flexibility to

choose the best solution. The chipsets work with a wide range

of baseband ASICs.

The Conexant WCDMA RF Subsystem is compliant with the 3GPP

terminal specifications. Furthermore, our RFICs come in compact

land grid array (LGA) packages, resulting in a very small form

factor. Conexant is the first supplier to commercialize this patented

process for an RF package. This true chip-scale solution enables

OEMs to produce smaller phones. This complete 3G solution is

comprised of the following semiconductor products:

• CX74040 highly integrated super-heterodyne WCDMA transmitter

• CX74041 highly integrated super-heterodyne WCDMA receiver

• CX77115 WCDMA PCS 3 to 4 volt power amplifier (PA)

• CX74038 2.6 GHz/800 MHz dual fractional-N frequency synthesizer

CX74040 WCDMA Transmitter

The CX74040 is a highly integrated super-heterodyne

transmitter that incorporates all the active functional blocks

required for implementing the transmitter up to the power

amplifier. It is based on the super-heterodyne transmitter

architecture. The transmitter is designed to meet the

demanding WCDMA 3GPP specifications while consuming

the lowest possible current. The transmit path consists of

the I/Q modulator, variable gain amplifier (VGA), Image

reject upconverting mixer, and driver amplifier. The

CX74040 also integrates the UHF and VHF synthesizers

for the transmitter.

CX74041 WCDMA Receiver

The CX74041 is a highly integrated super-heterodyne

receiver that incorporates all the active components

required to implement a WCDMA receiver. The CX74041

includes an LNA bypass feature for better operation at

the higher signal strengths associated with many of

these applications. The noise figure, gain and third order

input intercept point (IIP3) of each stage in the receiver

chip are optimized to meet the system requirements for

WCDMA terminals.

CX77115 WCDMA Power Amplifier

The CX77115 power amplifier is designed for 1920 to

1980 MHz WCDMA handset applications. The high spectral

linearity and power-added efficiency requirements of a

WCDMA handset amplifier are simultaneously met at

output powers up to 26.5 dBm. A single gallium arsenide

(GaAs) MMIC contains all active circuitry in the module.

The output match is realized within the module package

to maximize the amplifier’s power output and efficiency.

The CX77115 is manufactured to operate efficiently and

linearly without negative DC voltages. Primary power

supply can come from a three-cell nickel cadium battery,

a single-cell lithium ion battery or other suitable batteries

in the 3 to 4 volt range.

CX74038 Dual Fractional-N

Frequency Synthesizer

The CX74038’s RF/main and IF/auxiliary synthesizers

operate at up to 2.6 GHz and 800 MHz respectively.

The synthesizer meets the fast settling time requirements

for compressed mode of operation, while also meeting

the low power consumption requirements of terminal

applications. The CX74038’s ultra-fine frequency

step size (down to 10 Hz) makes it adaptable for

multimode/multiband operation. Additionally, the

ultra-fine frequency step size can be utilized for

frequency drift compensation.

features and specifications

CX74040

WCDMA Transmitter

• Based on super-heterodyne

transmitter architecture

• Meets WCDMA 3GPP

transmit specifications

• Integrates the UHF and VHF

synthesizers for the transmitter

CX74041

WCDMA Receiver

• Meets WCDMA 3GPP

receive specifications

• Integrated LNA with

bypass architecture

• VCO on/off control for standby

current optimization

• 6 x 6 mm RF Land Grid Array

(RF-LGA™) package with

down-set paddle

CX77115

WCDMA PA

• Low voltage positive bias supply

• Good linearity

• High efficiency

• Large dynamic range

• 6-pin LCC package (6 x 6 x 1.5 mm)

• Power down control

CX74038

Fractional-N Synthesizer

• 2.6 GHz maximum

operating frequency

• 800 MHz maximum IF synthesizer

• Supply voltage as low as 2.6V

• Fast frequency settling time with

fractional-N operation, meeting

3GPP compressed mode

operation requirements

• Internal fractional spur reduction

www.conexant.com

General Information:

U.S. and Canada: (800) 854-8099

International: (949) 483-6996

Headquarters – Newport Beach

4311 Jamboree Rd, P.O. Box C

Newport Beach, CA 92660-3095

Order# 101598B

01-0839

Conexant and the Conexant logo are trademarks

of Conexant Systems, Inc. Other trademarks are

owned by their respective owners. Although Conexant

strives for accuracy in all its publications, this material

may contain errors or omissions and is subject to

change without notice. THIS MATERIAL IS PROVIDED AS IS

AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,

INCLUDING MERCHANTABILITY, FITNESS FOR A PARTICULAR

PURPOSE AND NON-INFRINGEMENT. Conexant shall not be

liable for any special, indirect, incidental or consequential

damages as a result of its use.

Product Features

WCDMA system block diagram

CX74038

Fractional-N

Synthesizer

Duplexer

CX74040

WCDMA Tx CX77115

WCDMA PA

CX74041

WCDMA Rx

WCDMA

Baseband