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LMX2522

National Semiconductor
Part Number LMX2522
Manufacturer National Semiconductor
Description Frequency Synthesizer System
Published Apr 25, 2005
Detailed Description LMX2522/LMX2532 PLLatinum Dual Frequency Synthesizer System with Integrated VCOs June 2003 LMX2522/LMX2532 PLLatinum™ ...
Datasheet PDF File LMX2522 PDF File

LMX2522
LMX2522

Overview
LMX2522/LMX2532 PLLatinum Dual Frequency Synthesizer System with Integrated VCOs June 2003 LMX2522/LMX2532 PLLatinum™ Frequency Synthesizer System with Integrated VCOs General Description LMX2522 and LMX2532 are highly integrated, high performance, low power frequency synthesizer systems optimized for Korean PCS (K-PCS) with GPS and Korean Cellular (K-Cellular) with GPS, CDMA (1xRTT, IS-95) mobile handsets.
Using a proprietary digital phase locked loop technique, LMX2522 and LMX2532 generate very stable, low noise local oscillator signals for up and down conversion in wireless communications devices.
LMX2522 and LMX2532 include a RF voltage controlled oscillator (VCO), a GPS VCO, a loop filter, and a fractional-N RF PLL based on a delta sigma modulator.
In concert these blocks form a closed loop RF and GPS synthesizer system.
LMX2522 supports the Korean PCS band with GPS and LMX2532 supports the Korean Cellular band with GPS.
LMX2522 and LMX2532 include an Integer-N IF PLL also.
For more flexible loop filter designs, the IF PLL includes a 4-level programmable charge pump.
Together with an external VCO and loop filter, LMX2522 and LMX2532 make a complete closed loop IF synthesizer system.
Serial data is transferred to the device via a three-wire MICROWIRE interface (DATA, LE, CLK).
Operating supply voltage ranges from 2.
7 V to 3.
3 V.
LMX2502 and LMX2512 feature low current consumption: 17 mA at 2.
8 V.
LMX2522 and LMX2532 are available in a 28-pin leadless leadframe package (LLP).
Features n Small Size Small 5.
0 mm x 5.
0 mm x 0.
75 mm 28-Pin LLP Package n RF/GPS Synthesizer System Integrated RF VCO Integrated GPS VCO Integrated Loop Filter Low Spurious, Low Phase Noise Fractional-N RF PLL Based on 11-bit Delta Sigma Modulator 10 kHz Frequency Resolution n IF Synthesizer System Integer-N IF PLL Programmable Charge Pump Current Levels Programmable Frequencies n Supports Various Reference Oscillator Frequencies 19.
20/19.
68 MHz n Fast Lock Time: 500 µs n Low Current Con...


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