LMX2350TMX ,2.5 GHz/550 MHz PLLatinum Fractional N RF / Integer N IF Dual Low Power Frequency SynthesizerPin DescriptionsPin No. Pin No. Pin Name I/O Descriptionfor CSP forPackage TSSOPpackage24 1 OUT0 O ..
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LMX2354SLB ,PLLatinum Fractional N RF/ Integer N IF Dual Low Power Frequency SynthesizerFeaturesn Pin compatible/functional equivalent to the LMX2350The LMX2354 is part of a family of mon ..
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LMX2350TMX
2.5 GHz/550 MHz PLLatinum Fractional N RF / Integer N IF Dual Low Power Frequency Synthesizer
LMX2350/LMX2352
PLLatinum Fractional N RF/ Integer N IF
Dual Low Power Frequency Synthesizer
LMX2350 2.5 GHz/550 MHz
LMX2352 1.2 GHz/550 MHz
General DescriptionThe LMX2350/2352is partofa familyof monolithic inte-
grated fractionalN/ IntegerN frequency synthesizers de-
signedtobe usedina local oscillator subsystemfora radio
transceiver.Itis fabricated using National’s 0.5μ ABiCV
silicon BiCMOS process. The LMX2350/2352 contains dual
modulus prescalers along with modulo15or16 fractional
compensation circuitryin theRF divider.A 16/17or 32/33
prescale ratio canbe selectedfor the LMX2350, and the
LMX2352 provides 8/9or 16/17 prescale ratios. TheIF
circuitryfor boththe LMX2350 and LMX2352 containsan8/9
prescaler, andis fully programmable. Usinga fractionalN
phase locked loop technique,the LMX2350 /52 can gener-
ate very stable low noise control signalsfor UHF and VHF
voltage controlled oscillators (VCOs).
For the RF PLL,a highly flexible16 level programmable
charge pump supplies output current magnitudes from
100μAto 1.6mA. Two uncommitted CMOS outputs canbe
usedto provide external control signals,or configuredto
FastLock™ mode. Serial datais transferred into the
LMX2350/2352viaa three wire interface (Data, LE, Clock).
Supply voltage can range from2.7Vto5.5V. The LMX2350/
LMX2352 family features very low current consumption; typi-
cally LMX2350 (2.5 GHz) 6.5 mA, LMX2352 (1.2 GHz) 4.75at 3.0V. The LMX2350/2352 are availableina 24-pin
TSSOP and 24-pin CSP surface mount plastic package.
Features 2.7Vto5.5V operation Low current consumption
LMX2350:Icc= 6.75mAtypat3v
LMX2352:Icc= 5.00mAtypat3v Programmableor logical power down mode
Icc=5μA typat3v Modulo15or16 fractionalRFN divider supports ratios1,2,3,4,5,8,15,or16 Programmable charge pump current levels 100μAto 1.6mAin 100μA steps 100μAor 800μA Digital filtered lock detect
Applications Portable wireless communications (PCS/PCN, cordless) Dual mode cellular telephone systems Zero blind slot TDMA systems Spread spectrum communication systems (CDMA) CableTV Tuners (CATV)
Block DiagramDS100831-1
March 2001
LMX2350/LMX2352
PLLatinum
Fractional
Integer
Dual
Low
Power
Frequency
Synthesizer
