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LMX2542

National Semiconductor
Part Number LMX2542
Manufacturer National Semiconductor
Description Cellular and GPS Frequency Synthesizer System
Published Apr 25, 2005
Detailed Description LMX2542 PLLatinum Cellular and GPS Frequency Synthesizer System with Integrated VCOs May 2004 LMX2542 PLLatinumTM Cell...
Datasheet PDF File LMX2542 PDF File

LMX2542
LMX2542

Overview
LMX2542 PLLatinum Cellular and GPS Frequency Synthesizer System with Integrated VCOs May 2004 LMX2542 PLLatinumTM Cellular and GPS Frequency Synthesizer System with Integrated VCO General Description LMX2542 is a highly integrated, high performance, low power frequency synthesizer system optimized for CellularCDMA 1xRTT and IS-95 mobile handsets and data systems with GPS capabilities.
Using a proprietary digital phase locked loop technique, LMX2542 provides very stable, low noise local oscillator (LO) signals for up and down conversion in wireless communications devices.
LMX2542 includes a Voltage Controlled Oscillator (VCO) for both the Cellular-CDMA and GPS frequency bands, a loop filter, and a Fractional-N RF PLL based on a Delta Sigma (∆Σ) modulator.
In concert, these blocks form a closed loop RF synthesizer system.
The RF synthesizer system operates from 2087.
73 MHz to 2155.
14 MHz.
LMX2542 includes an Integer-N IF PLL also.
For more flexible loop filter designs, the IF PLL inclu...


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