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SKY74702 Dataheets PDF



Part Number SKY74702
Manufacturers Skyworks Solutions
Logo Skyworks Solutions
Description Transmitter for CDMA Applications
Datasheet SKY74702 DatasheetSKY74702 Datasheet (PDF)

www.DataSheet4U.com PRODUCT SUMMARY SKY74702: Transmitter for CDMA Applications Applications • CDMA phones in the cellular band: ⎯ CDMA-US ⎯ CDMA-Japan The signal enters the chip as a baseband I/Q signal, which is upconverted by an I/Q quadrature modulator. The resulting signal is fed through a VGA to provide variable output power. After leaving the open collector output of the VGA, the signal enters a switch matrix. This switch matrix allows the signal to be routed through an external filter,.

  SKY74702   SKY74702


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www.DataSheet4U.com PRODUCT SUMMARY SKY74702: Transmitter for CDMA Applications Applications • CDMA phones in the cellular band: ⎯ CDMA-US ⎯ CDMA-Japan The signal enters the chip as a baseband I/Q signal, which is upconverted by an I/Q quadrature modulator. The resulting signal is fed through a VGA to provide variable output power. After leaving the open collector output of the VGA, the signal enters a switch matrix. This switch matrix allows the signal to be routed through an external filter, or it can be filtered by the tuned collector load and passed directly to the UHF image reject mixer. The image reject mixer is internally connected to the PA driver. The mixer driver combination has a variable gain control that can be used to reduce the RF gain, which improves the in-band Signal-to-Noise Ratio (SNR) at a lower output power. The PA driver amplifies the RF signal to the appropriate level for the desired output power. This is then filtered by a bandpass filter and sent to an external PA to obtain the final rated output power at the antenna. The device package and pinout for the 40-pin RF Land Grid Array (RFLGA) are shown in Figure 1. A block diagram of the SKY74702 is shown in Figure 2. Features • Serial bus interface control • Low power consumption in all operating modes • Image reject upconverter replaces external RF SAW filter • Transmit power control with 90 dB dynamic range • Variable gain RF block for improved in-band SNR • VHF VCO (external tank), 200 to 700 MHz • VHF VCO switching to increase the talk time of the radio • Two separate PLL synthesizers provide dual-loop, multi-band operation and power-save mode for both standby and lower frequency of operation DataShee VCC_MIXER_1 VCC_MIXER_2 VGA_OUT+ VGA_OUT– VGA_CTRL • Transmit puncture pin disables programmable portions of device • RFLGA™ (40-pin, 6 x 6 x 1 mm) package with downset paddle VCC_IF Q+ Q– 1 2 3 4 5 6 7 8 9 10 11 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 POT_CELL • Fully programmable PLL dividers and selectable charge pump DataSheet4U.com currents for multi-VCO applications IF_IN+ IF_IN– N/C N/C N/C N/C N/C VCC_BIAS_DIFF_DRV CDMA_DRV_OUT VCC_CDMA_DRV TX_PUNCTURE DATA LATCH_ENABLE CLK Description The SKY74702 device is a single-supply, monolithic integrated circuit. It is designed for use in single-mode Code Division Multiple Access (CDMA) cellular voice/data applications including extensions for CDMA-Japan. The SKY74702 is a highly integrated superheterodyne transmitter that incorporates the following components: • In-Phase and Quadrature (I/Q) modulator – accepts the analog I and Q current outputs from the baseband analog processor and converts them to Intermediate Frequency (IF) signals • Voltage Controlled Oscillator (VCO) and VHF synthesizer – generates the LO signal for the quadrature modulator • UHF synthesizer – controls the UHF oscillator • Variable Gain Amplifier (VGA) – provides the variable output power for CDMA systems • Image reject upconverter and power amplifier (PA) drivers DataSheet4U.com VCC_IQ_MOD I+ I– VCC_DIV VCO_TANK+ VCO_TANK– IREF POT_IREF 12 13 14 15 16 17 18 19 20 VCC_CLK VCC_VHF VHF_CP REF UHF_CP VCC_UHF LD_OUT SYN_LO UHF_LO S304 Figure 1. SKY74702 Pinout – 40-Pin RFLGA Package (Top View) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200030B • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • January 31, 2005 1 DataSheet 4 U .com www.DataSheet4U.com PRODUCT SUMMARY • SKY74702 VCC VCC VCC_MIXER_2 VCC_ IQ_MOD I+ I– ÷4 ÷2 UHF_LO Mux Q+ Q– VCO_TANK+ VCO_TANK– VCC_MIXER_1 VCC Bias VCC_IF VGA_CTRL VCC_CLK IREF CDMA_DRV_OUT POT_CELL ÷2 ÷1 VHF PLL UHF PLL Control Signal TX_PUNCTURE Lock Detect VHF_CP UHF_CP SYN_LO DATA Enable REF CLK CDMA Driver Bias S305 et4U.com Figure 2. SKY74702 Transmitter Block Diagram Ordering Information Model Name SKY74702 CDMA Transmitter DataSheet4U.com Manufacturing Part Number SKY74702-11 Product Revision 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 intellectu.


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