CX74040 - Skyworks Solutions, Inc.

Skyworks Solutions, Inc. Proprietary and Confidential 1

103117A [781] 376-3000 I FAX [781] 376-3100 I SALES@SKYWORKSINC.COM I WWW.SKYWORKSINC.COM APRIL 25 2003

PRODUCT SUMMARY

CX74040: Tx ASIC for WCDMA and UMTS Applications

APPLICATIONS

• WCDMA

FEATURES

• Single battery cell operation (2.7 V < VCC < 3.3 V)

• Low power consumption in all operating modes

• Transmit power control with 90 dB dynamic range

• Variable gain RF block to meet Signal-to-Noise Ratio (SNR)

• 100 to 1200 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 lower frequency of operation

• Fully programmable PLL dividers, selectable charge-pump

currents for multi-VCO applications controlled via the Serial

Bus Interface

• 40-pin, 6 mm x 6 mm RFLGA package with downset paddle

20 32

UHF_CP

LD_OUT

VCC_CLK

VCC_VHF

VHF_CP

VCC_UHF

REF

VCC_UHF_SYNTH

UHF_LO_SYNTH

POT_DRV

UHF_LO

DATA

CLK

SEC_DRV_BYPASS

VCC_BIAS_SEC_DRV

RFGC

VCC_BIAS_DIFF_DRV

VCC_DIFF_DRV

LATCH_ENABLE

SEC_DRV_OUT

VGA_OUT+

VGA_OUT–

VCC_IF

POT_MIX

VCC_MIXER2

VCC_MIXER1

POT_UHF_LO

VCC_BIAS_MIX

DRIVER_ON

IF_IN–

IF_IN+

VCO_TANK+

VCO_TANK–

Q–

I–

VCC_DIV

I+

Q+

VGA_CTRL

VCC_IQ_MOD

Figure 1. CX74040 Pinout – 40-Pin LGA (Top View)

The CX74040 Application-Specific Integrated Circuit (ASIC) is a

single supply, monolithic integrated circuit that incorporates all

the active functional blocks required for a transmitter. It is

designed for use in Wideband Code Division Multiple Access

(WCDMA) and Universal Mobile Telecommunication System

(UMTS) voice/data applications in the IMT-2000 frequency

band.

The highly integrated super-heterodyne transmitter comprises

all the critical components to implement the transmitter chain:

an In-Phase and Quadrature (I/Q) modulator that accepts the

analog I and Q outputs from the baseband processor and

converts them to Intermediate Frequency (IF) signals; a Voltage

Controlled Oscillator (VCO) and VHF synthesizer to generate the

Local Oscillator (LO) signal for the quadrature demodulators; a

UHF synthesizer to control the UHF oscillator; and a Variable

Gain Amplifier (VGA), which is required in CDMA systems to

provide a linear variable output power at the antenna.

The output of the VGA is fed to the upconverter with a provision

of Rx band filtering using a discrete IF filter. The output of the

upconverter is fed to the power amplifier pre-driver and filtered

using a bandpass filter. The output is sent to an external power

amplifier to obtain the rated final output power at the antenna.

The device package and pinout for the 40-pin RF Land Grid

Array (RFLGA™) device is shown in Figure 1. A block diagram

of the CX74040 is shown in Figure 2.

Product Summary I CX74040

2 Skyworks Solutions, Inc. Proprietary and Confidential

APRIL 25 2003 [781] 376-3000 I FAX [781] 376-3100 I SALES@SKYWORKSINC.COM I WWW.SKYWORKSINC.COM 103117A

I+

I–

Q+

Q–

TANK

UHF LO

POT Mix

Control Sig

VHF PLL

Data

Clock

Ref

PDout

Lock det

UHF PLL

PDout

UHF VCO

Filter

DRIVER

VGA Control

RF Gain Control

÷2/4

90°

Figure 2. CX74040 Tx ASIC Block Diagram

Ordering Information

Model Name Manufacturing Part

Number

Product Revision

Transmitter ASIC CX74040

Information in this document is provided in connection with Skyworks Solutions, Inc. ("Skyworks") products. These materials are provided by Skyworks as a service to its

customers and may be used for informational purposes only. Skyworks assumes no responsibility for errors or omissions in these materials. Skyworks may make changes

to its products, specifications and product descriptions at any time, without notice. Skyworks makes no commitment to update the information and shall have no

responsibility whatsoever for conflicts, incompatibilities, or other difficulties arising from future changes to its products and product descriptions.

No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as may be provided in Skyworks’ Terms

and Conditions of Sale for such products, Skyworks assumes no liability whatsoever.

THESE MATERIALS ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, RELATING TO SALE AND/OR USE OF SKYWORKS™

PRODUCTS INCLUDING WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY, PERFORMANCE, QUALITY OR NON-INFRINGEMENT OF ANY

PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. SKYWORKS FURTHER DOES NOT WARRANT THE ACCURACY OR COMPLETENESS OF THE INFORMATION,

TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN THESE MATERIALS. SKYWORKS SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL, OR

CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION, LOST REVENUES OR LOST PROFITS THAT MAY RESULT FROM THE USE OF THESE MATERIALS.

Skyworks™ products are not intended for use in medical, lifesaving or life-sustaining applications. Skyworks’ customers using or selling Skyworks™ products for use in

such applications do so at their own risk and agree to fully indemnify Skyworks for any damages resulting from such improper use or sale.

The following are trademarks of Skyworks Solutions, Inc.: Skyworks™, the Skyworks symbol, SPR™, Single Package Radio™, and “Breakthrough Simplicity”™. Product

names or services listed in this publication are for identification purposes only, and may be trademarks of third parties. Third-party brands and names are the property of

their respective owners.

RFLGA™ is a trademark of Conexant Systems, Inc.

Additional information, posted at www.skyworksinc.com, is incorporated by reference.

General Information

Skyworks Solutions, Inc.

20 Sylvan Rd.

Woburn, MA 01801