Part # LMX2354 datasheet 

Part Manufacturer: National Semiconductor 

Part Description: LMX2354 PLLatinum Fractional N RF Integer N IF Dual Low Power Frequency Synthesizer LMX2354 2.5 GHz 550 MHz 

Part Details:LMX2354 August 2001 LMX2354 PLLatinum PLLatinum Fractional N RF/ Integer N IF Dual Low PowerFrequency SynthesizerLMX2354 2.5 GHz/550 MHzGeneral Description Features Fractional The LMX2354 is part of a family of monolithic integrated n Pin compatible/functional equivalent to the LMX2350 fractional N/Integer N frequency synthesizers designed to be n Enhanced Low Noise Fractional Engine used in a local oscillator subsystem for a radio transceiver. It n 2.7V to 5.5V operation is fabricated using National s 0.5 µ ABiC V silicon BiCMOS n Low current consumption process. The LMX2354 contains quadruple modulus pres LMX2354: I = 7 mA typical at 3V CC calers along with modulo 15 or 16 fractional compensation n Programmable or logical power down mode: N circuitry in the RF divider. The LMX2354 provides a continu I = 5 µA typical at 3V CC ous divide ratio of 80 to 32767 in 16/17/20/21 RF/ n Modulo 15 or 16 fractional RF N divider supports ratios (1.2 GHz2.5 GHz) fractional mode and 40 to 16383 in of 1, 2, 3, 4, 5, 8, 15, or 16 8/9/12/13 (550 MHz1.2 GHz) fractional mode. The IF circuitry for the LMX2354 contains an 8/9 prescaler, and is fully n Programmable charge pump current levels Integer RF 100 µA to 1.6 mA in 100 µA steps programmable. Using a fractional N phase locked loop tech IF 100 µA or 800 µA nique, the LMX2354 can generate very stable low noisecontrol signals for UHF and VHF voltage controlled oscilla n Digital filtered lock detect tors (VCOs). n Available in 24pin TSSOP and 24pin CSP For the RF PLL, a highly flexible 16 level programmable N charge pump supplies output current magnitudes from 100 Applications µA to 1.6 mA. Two uncommitted CMOS outputs can be used I 

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