Part # LMX2502 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LMX2502 LMX2512 PLLatinum Frequency Synthesizer System with Integrated VCO

Part Details:

LMX2502/LMX2512 June 2003 LMX2502/LMX2512PLLatinumTM Frequency Synthesizer System withIntegrated VCOGeneral Description Features Frequency LMX2502 and LMX2512 are highly integrated, high perfor- n Small Size mance, low power frequency synthesizer systems optimized 5.0 mm X 5.0 mm X 0.75 mm 28-Pin LLP Package for Korean PCS and Korean Cellular CDMA (1xRTT, IS-95) n RF Synthesizer System mobile handsets. Using a proprietary digital phase locked Integrated RF VCO loop technique, LMX2502 and LMX2512 generate very Integrated Loop Filter stable, low noise local oscillator signals for up and down Low Spurious, Low Phase Noise Fractional-N RF PLL conversion in wireless communications devices. Based on 11-Bit Delta Sigma Modulator Synthesizer LMX2502 and LMX2512 include a voltage controlled oscil- 10 kHz Frequency Resolution lator (VCO), a loop filter, and a fractional-N RF PLL based on n IF Synthesizer System a delta sigma modulator. In concert these blocks form a Integer-N IF PLL closed loop RF synthesizer system. LMX2502 supports the Programmable Charge Pump Current Levels Korean PCS band and LMX2512 supports the Korean Cel- Programmable Frequency lular band. n Supports Various Reference Frequencies LMX2502 and LMX2512 include an Integer-N IF PLL also. 19.20/19.68 MHz For more flexible loop filter designs, the IF PLL includes a n Fast Lock Time: 500 µs 4-level programmable charge pump. Together with an exter- n Low Current Consumption System nal VCO and loop filter, LMX2502 and LMX2512 make a 17 mA at 2.8 V complete closed loop IF synthesizer system. n 2.7 V to 3.3 V Operation Serial data is transferred to the device via a three-wire n Digital Filtered Lock Detect Output MICROWIRE interface (DATA, LE, CLK). n Hardware and Software Power Down Control Operating supply voltage ranges from 2.7 V to 3.3 V. with LMX2502 and LMX2512 feature low current consumption: Applications 17 mA at 2.8 V. n Korean PCS CDMA Systems LMX2502 and LMX2512 are available in a 28-pin leadless n Korean Cellular CDMA Systems

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LMX2502.pdf Datasheet