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PRODUCT SUMMARY
CX74061: Rx ASIC for CDMA, AMPS, PCS, and GPS Mobile Handset Applications
APPLICATIONS
* Tri-band, quad-mode handsets * PCS and GPS phones * CDMA and GPS phones After RF LNA signal amplification and filtering from the antenna, the received signal is mixed down from RF to the IF. There are separate mixers for AMPS, CDMA-cellular, CDMAPCS, and GPS modes. The CDMA and PCS mixers have balanced outputs for the IF SAW filters, while the AMPS differential output can be combined externally to mate to a single-ended SAW filter. The GPS mixers have a differential output for an external L-C bandpass filter. After IF filtering, the IF signal is amplified by a Variable Gain Amplifier (VGA) and fed to an I/Q demodulator, resulting in baseband I/Q signals at the output. The CX74061 is also designed with two Local Oscillator (LO) input ports, one for the AMPS/CDMA/PCS mixer and one for the GPS mixer. These mixers operate at different RF frequency inputs, but have the same IF frequency output. This usually refers to a single IF (SIF) plan at 183.6 MHz. The PCS/CELL_LO signal (pin 36) provides an LO port for the CDMA-cellular and CDMA-PCS mixers. The PCS band is selected by default as an input LO frequency to the PCS mixer. In the cellular band, the frequency is divided by two by an internal divider, which provides the LO input to the cellular mixer. Only one external VCO is required for the UHF PLL. Additionally, the mixer LO signal is coupled and amplified internally, which provides another RF signal to drive the transmtiter upconverter LO port. The VGA has a minimum dynamic range of 90 dB with a control voltage range of 0.3 to 2.5 V, which is common to all modes. A VHF oscillator operates with external tank circuits to provide LO frequencies for the I/Q demodulator in the cellular, PCS, and GPS modes. 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 AMPS and CDMA modes according to TIA/EIA-98-C. The ASIC design employs BiCMOS technology for low cost, high performance, and a high level of integration. A block diagram of the CX74061 is shown in Figure 1.
FEATURES
* * * * * * * * * * * * * Two-step gain control PCS LNA Three-step gain control cellular LNA GPS LNA External resistor to adjust LNA bias current Independent AMPS, CDMA, PCS, and GPS mixers Single LO input for CDMA and PCS mixer Buffered LO signal for transmit upconverter Single external UHF VCO for PLL circuitry 90 dB dynamic range VGA 200 to 600 MHz VHF oscillator VCO_ON control for current optimization Battery cell operation (2.7 V < Vcc < 3.3 V) 7 x 7 mm 48-pin RFLGATM package with down-set paddle
DESCRIPTION
The CX74061 Application-Specific Integrated Circuit (ASIC) is a single Intermediate Frequency (IF), multi-mode, tri-band receiver intended for use in Code Division Multiple Access (CDMA) phones in Personal Communications System (PCS), cellular CDMA, Advanced Mobile Phone System (AMPS), and Global Positioning System (GPS) modes. The CX74061 is a highly integrated super-heterodyne receiver. Except for the Surface Acoustic Wave (SAW) filters and matching components, the device incorporates all the components required to implement the receiver chain, from the Low-Noise Amplifier (LNA) to the In-Phase and Quadrature (I/Q) demodulator stages. Three LNAs are in the front-end receiver: a three-step gain stage cellular LNA (high, mid, and bypass), a two-step gain stage PCS LNA (high, bypass), and a high gain stage GPS LNA.
Skyworks Solutions, Inc. Proprietary and Confidential
103083A [781] 376-3000 I FAX [781] 376-3100 I SALES@SKYWORKSINC.COM I WWW.SKYWORKSINC.COM
1
FEBRUARY 5, 2003
Product Summary I CX74061
GPS_LNA_OUT
CELL_LNA_OUT
PCS_LNA_OUT
PCS/CELL_LO
CELL_MIX_IN
PCS_MIX_IN
GPS_MIX_IN
GPS_LO
GPS_LNA_IN
LNA1 LNA2
LO_OUT
/2
CELL_LNA_IN
PCS_LNA_IN
GPS_MIX_OUT- GPS_MIX_OUT+
MIX_OUT+ MIX_OUT- AMPS_MIX_OUT+
AMPS_MIX_OUT- VCOTNK1- GPS_VGA_IN VCOTNK1+ 90o
VGA_IN+
VGA_IN-
AMPS_VGA_IN
PLL
Q+
Q-
I+
I-
C1341
Figure 1. CX74061 Receiver ASIC Block Diagram
Ordering Information
Model Name
CDMA Receiver ASIC
Manufacturing Part Number
CX74061-11P
Product Revision
(c) 2002, 2003 Skyworks Solutions, Inc. All Rights Reserved. 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 SKYWORKSTM 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. SkyworksTM products are not intended for use in medical, lifesaving or life-sustaining applications. Skyworks' customers using or selling SkyworksTM 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.: SkyworksTM, the Skyworks symbol, SPRTM, Single Package RadioTM, and "Breakthrough Simplicity"TM. Product names or services listed in this publication are for identification purposes only, and may be trademarks of third parties. Thirdparty brands and names are the property of their respective owners. RFLGATM 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 www.skyworksinc.com

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