PRODUCT SUMMARY SKY74691: Receiver for CDMA Mobile Handset Applications Applications After RF LNA signal amplification and filtering from the antenna, the received signal is downconverted from RF to the Intermediate Frequency (IF). • Single mode CDMA handsets The LO_IN signal (pin 39) provides a Local Oscillator (LO) port for the RF mixer. The UHF Voltage Controlled Oscillator (VCO) is buffered and amplified internally, and provides the LO to drive the LO port of a transmitter upconverter (such as Skyworks CX74002). Features • Three-step gain control, cellular LNA • External resistor to adjust LNA bias current • Buffered LO signal for transmit upconverter The Variable Gain Amplifier (VGA) has a minimum dynamic range of 90 dB with a control voltage range of 0.2 to 2.7 V. A VHF oscillator operates with an internal tank circuit to provide LO frequencies for the I/Q demodulator. • VGA with 90 dB dynamic range • Integrated IF VCO and tank circuit • VCO_ON auto-tuning control The noise figure, gain, and third order Input Intercept Point (IIP3) of each stage in the receiver are optimized to meet the system requirements for CDMA according to TIA/EIA-98-B/C. The design employs SiGe BiCMOS technology for low cost, high performance, and a high level of integration. • Battery cell operation (2.7 V < VCC < 3.3 V) • RFLGA™ (48-pin, 7 x 7 mm) Pb-free package (MSL3, 260 °C per JEDEC-J-STD-020) with downset paddle The device package and pinout for the 48-pin RF Land Grid Array (RFLGA) are shown in Figure 1 and a block diagram of the SKY74691 is shown in Figure 2. Description The SKY74691 is a highly integrated, super-heterodyne receiver. This single band receiver is intended for use in Code Division Multiple Access (CDMA) phones in cellular CDMA mode. Skyworks offers lead (Pb)-free “environmentally friendly” packaging that is RoHS compliant (European Parliament for the Restriction of Hazardous Substances). 48 47 46 45 44 43 42 41 MODE_0 LO_IN MIX_VCC CELL_MIX_IN N/C RF_BIAS_RES GND N/C N/C CELL_LNA_OUT GND 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. 40 39 38 GND 1 37 MODE_1 CELL_LNA_IN 2 36 LO_OUT GND 3 35 LO_BUFF_VCC N/C 4 34 N/C GND 5 33 N/C N/C 6 32 CELL_IF+ VCC_RF_BIAS 7 31 CELL_IF– LNA_BIAS_RES 8 30 N/C LNA_0 9 29 N/C LNA_1 10 28 VGA_VCC VCO_ON 11 27 N/C VCO_DEC_CAP 12 26 CDMA_VGA_IN+ VCO_TUNE 13 25 CDMA_VGA_IN– N/C BUFF_EN 22 23 24 VGACTRL SLEEP XTAL Q– Q+ I– I+ PLL VCC_VCO 14 15 16 17 18 19 20 21 S307 Figure 1. SKY74691 Pinout – 48-Pin RFLGA (Top View) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200029B • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • January 14, 2005 1 LO_IN CELL_MIX_IN CELL_LNA_OUT PRODUCT SUMMARY • SKY74691 ÷2 Cellular LNA CDMA, 800 MHz 2 LO_OUT CELL_LNA_IN Cellular Mixer CDMA, 800 MHz CELL_IF+ CELL_IF– AFC VCO_TUNE ÷4 ÷2 CDMA_VGA_IN+ CDMA_VGA_IN– XTAL Q– Q+ I– I+ PLL 90o S308 Figure 2. SKY74691 Receiver Block Diagram Ordering Information Model Name SKY74691 CDMA Receiver Manufacturing Part Number Product Revision SKY74691-11 Copyright © 2003, 2004, 2005 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 by the customer. Skyworks assumes no responsibility for errors or omissions in these materials. Skyworks may make changes to its documentation, 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 documentation, products, specifications and product descriptions. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by or under this document. Except as may be provided in Skyworks’ Terms and Conditions of Sale for such products, Skyworks assumes no liability whatsoever in association with its documentation, products, specifications and product descriptions. 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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 logo, and Breakthrough Simplicity®. Product names or services listed in this publication are for identification purposes only, and may be trademarks of Skyworks or other third parties. Third-party brands and names are the property of their respective owners. Additional information, posted at www.skyworksinc.com, is incorporated by reference. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 2 January 14, 2005 • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • 200029B