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LMX2354
PLLatinum Fractional N RF/ Integer N IF Dual Low Power Frequency Synthesizer 2.5 GHz/550 MHz
LMX2354
PLLatinum Fractional N RF/ Integer N IF Dual Low Power
Frequency Synthesizer
LMX2354 2.5 GHz/550 MHz
General DescriptionThe LMX2354is partofa familyof monolithic integrated
fractional N/IntegerN frequency synthesizers designedtobe
usedina local oscillator subsystemfora radio transceiver.It fabricated using National’s 0.5μ ABiCV silicon BiCMOS
process. The LMX2354 contains quadruple modulus pres-
calers along with modulo15or16 fractional compensation
circuitryintheRF divider. The LMX2354 providesa continu-
ous divide ratio of 80 to 32767 in 16/17/20/21
(1.2 GHz–2.5 GHz) fractional mode and40to 16383in
8/9/12/13 (550 MHz–1.2 GHz) fractional mode. TheIF cir-
cuitryforthe LMX2354 containsan8/9 prescaler, andis fully
programmable. Usinga fractionalN phase locked loop tech-
nique, the LMX2354 can generate very stable low noise
control signalsfor UHF and VHF voltage controlled oscilla-
tors (VCOs).
For the RF PLL,a highly flexible16 level programmable
charge pump supplies output current magnitudes from 100to1.6 mA. Two uncommitted CMOS outputs canbe used provide external control signals,or configuredto FastLock
mode. Serial datais transferred intothe LMX2354viaa three
wire interface (Data, LE, Clock). Supply voltage can range
from 2.7Vto 5.5V. The LMX2354 family features very low
current consumption; typically LMX2354 (2.5 GHz)— 7.0
mA. The LMX2354 are availableina 24-pin TSSOP surface
mount plastic package and 24-pin CSP.
Features Pin compatible/functional equivalenttothe LMX2350 Enhanced Low Noise Fractional Engine 2.7Vto 5.5V operation Low current consumption
LMX2354:ICC=7 mA typicalat3V Programmableor logical power down mode:
ICC=5μA typicalat3V Modulo15or16 fractionalRFN divider supports ratios1,2,3,4,5,8,15,or16 Programmable charge pump current levels 100μAto1.6 mAin 100μA steps 100μAor 800μA Digital filtered lock detect Availablein 24-pin TSSOP and 24-pin CSP
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)
Functional Block DiagramAugust 2001
LMX2354
PLLatinum
Fractional
RF/
Integer
Dual
Low
Power
Frequency
Synthesizer
