SKY74691

www.DataSheet4U.com PRODUCT SUMMARY SKY74691: Receiver for CDMA Mobile Handset Applications Applications Single mode CDMA handsets After RF LNA signal amplification and filtering from the antenna, the received signal is downconverted from RF to the Intermediate Frequency (IF). 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). 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. 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. Features Three-step gain control, cellular LNA External resistor to adjust LNA bias current Buffered LO signal for transmit upconverter VGA with 90 dB dynamic range Integrated IF VCO and tank circuit VCO_ON auto-tuning control 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 Gr...