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LMX2336N/a3avaiPLLatinum(TM) 1.1 GHz Dual Frequency Synthesizer for RF Personal Communications
LMX2335NSN/a5365avaiPLLatinum(TM) 1.1 GHz Dual Frequency Synthesizer for RF Personal Communications


LMX2335 ,PLLatinum(TM) 1.1 GHz Dual Frequency Synthesizer for RF Personal CommunicationsFeaturesY2.7V to 5.5V operationLMX2336 2.0GHz/1.1GHzYLow current consumptionLMX2337 550MHz/550MHzYS ..
LMX2335LM ,PLLatinum⑩ Low Power Dual Frequency Synthesizer for RF Personal CommunicationsPin DescriptionsPin No. Pin No. Pin No. Pin No. Pin I/O Description2336LTM 2336LSLB 2335LTM 2335LSL ..
LMX2335LTM ,PLLatinum Low Power Dual Frequency Synthesizer for RF Personal CommunicationsPin DescriptionsPin No. Pin No. Pin No. Pin No. Pin I/O Description2336LTM 2336LSLB 2335LTM 2335LSL ..
LMX2335LTMX ,PLLatinum Low Power Dual Frequency Synthesizer for RF Personal Communicationsapplications requiring twon Selectable synchronous and asynchronous powerdownRF phase-lock loops. T ..
LMX2335M ,PLLatinum⑩ Dual Frequency Synthesizer for RF Personal CommunicationsPin DescriptionsPin No. Pin No. PinI/O Description2335/37 2336 Name11 V 1 Power supply voltage inpu ..
LMX2335TM ,PLLatinum⑩ Dual Frequency Synthesizer for RF Personal CommunicationsApplicationsemploy a digital phase locked loop technique, combined withn Cellular telephone systems ..
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LMX2335-LMX2336
PLLatinum(TM) 1.1 GHz Dual Frequency Synthesizer for RF Personal Communications
TL/W/12332
LMX2335/LMX2336/LMX2337
PLLatinum
Dual
Frequency
Synthesizer
for
Personal
Communications
September 1996
LMX2335/LMX2336/LMX2337
PLLatinumTM Dual Frequency Synthesizer
for RF Personal Communications
LMX2335 1.1 GHz/1.1 GHz
LMX2336 2.0 GHz/1.1 GHz
LMX2337 550 MHz/550 MHz
General Description
The LMX2335, LMX2336and LMX2337aremonolithic, inte-
grated dual frequency synthesizers, includingtwo highfre-
quencyprescalers,andare designed forapplicationsrequir-
ingtwoRF phase-lock loops. Theyare fabricated usingNa-
tional’s ABiCIV silicon BiCMOS process.
The LMX2335/36/37 contains two dual modulus prescal-
ers.A 64/65ora 128/129 prescaler canbe selectedfor
eachRF synthesizer.A second reference divider chainis
includedin the IC for improved system noise.
LMX2335/36/37, which employa digital phase locked loop
technique, combined witha high quality reference oscillator
and loop filters, providethe tuning voltagesfor voltage con-
trolledoscillatorsto generate very stablelow noiseRF local
oscillator signals.
Serial datais transferred intothe LMX2335/36/37viaa
three wire interface (Data, Enable, Clock). Supply voltage
can range from 2.7Vto 5.5V.The LMX2335/36/37 feature
verylow current consumption; LMX2335/37 b10mAat3V,
LMX2336 b13mAat3V.The LMX2335/37are availablein
botha JEDECSOand TSSOP 16-pin surface mount plastic
package. The LMX2336is availableina TSSOP 20-pinsur-
face mount plastic package.
Features 2.7Vto 5.5V operation Low current consumption Selectable powerdown mode:
ICCe1mA (typ) Dual modulus prescaler: 64/65or 128/129 Selectable charge pump TRI-STATEÉ mode Selectable charge pump current levels Selectable FastlockTM mode
Applications Cellular telephone systems (AMPS, ETACS, RCR-27) Cordless telephone systems
(DECT, ISM, PHS, CT-1a) Personal Communication Systems
(DCS-1800, PCN-1900) Dual Mode PCS phones CATV Other wireless communication systems
Functional Block Diagram
TL/W/12332–1
TRI-STATEÉ isaregistered trademarkof National SemiconductorCorporation.
FastlockTM, MICROWIRETMandPLLatinumTM aretrademarksofNationalSemiconductorCorporation.
C1996National SemiconductorCorporation RRD-B30M96/Printed inU.S.A. http://
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