Part # LMX2542 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LMX2542 PLLatinumTM Cellular and GPS Frequency Synthesizer System with Integrated VCO


Part Details:

LMX2542 May 2004 LMX2542 PLLatinum PLLatinumTM Cellular and GPS Frequency SynthesizerSystem with Integrated VCOGeneral Description Features LMX2542 is a highly integrated, high performance, low n Small Size Cellular power frequency synthesizer system optimized for Cellular- 5.0 mm x 5.0 mm x 0.75 mm 28-Pin LLP CDMA 1xRTT and IS-95 mobile handsets and data systems n RF Synthesizer System with GPS capabilities. Using a proprietary digital phase Integrated RF VCO locked loop technique, LMX2542 provides very stable, low Integrated Loop Filter noise local oscillator (LO) signals for up and down conver- Low Spurious, Low Phase Noise Fractional-N RF sion in wireless communications devices. PLL Based on 11-Bit modulator and LMX2542 includes a Voltage Controlled Oscillator (VCO) for 5 kHz Frequency Resolution both the Cellular-CDMA and GPS frequency bands, a loop Cellular-CDMA LO: 2105.28 MHz to 2155.14 MHz filter, and a Fractional-N RF PLL based on a Delta Sigma (Requires an External LO /2 Circuit) GPS () modulator. In concert, these blocks form a closed loop GPS LO: 2087.73 MHz RF synthesizer system. The RF synthesizer system oper- (Requires an External LO /1.5 Circuit) ates from 2087.73 MHz to 2155.14 MHz. n IF Synthesizer System Frequency LMX2542 includes an Integer-N IF PLL also. For more flex- Integer-N IF PLL ible loop filter designs, the IF PLL includes a 4-level pro- Programmable Charge Pump Current Levels grammable charge pump. Together with an external VCO IF LO: 367.20 MHz and loop filter, LMX2542 makes a complete closed loop IF n Supports Various Reference Oscillator Frequencies: synthesizer system. The default IF frequency is 367.20 MHz. 19.20 MHz/ 19.68 MHz Serial data is transferred to the device via a three-wire n Low Current Consumption: MICROWIRETM interface (DATA, LE, CLK). 22 mA typical at 2.8V n 2.7V to 3.3V Operation Operating supply voltage ranges from 2.7V to 3.3V. Synthesizer LMX2542 features low current consumption: 22 mA at 2.8V.


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LMX2542.pdf Datasheet