Texas Instruments LMX2571 Handleiding
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Fast
lock
Int. charge
pump
5V charge
pump
R-divider
Phase
detector
µWIRE
Prescaler
N-divider
Output
divider
Output
divider
G4
modulator
Transmit / Receive
To receive mixer
FinCPoutExtFLout
XO
SPICEFSK
OP
MUX
TrCtl
VCO
MUX
CP
MUX
Vcc3p3
VccIO
Lock
dect
MUXout
5V CP
supply
100pF
To driver amplifier
0.1µF
3.3V
0.1µF
3.3V/5V
SoC / DSP
100pF
Enable
0.1µF
2.2µF
VrefVCO
VregVCO
LMX2571
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AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,
intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.
LMX2571
SNAS654A–MARCH2015–REVISEDJULY2016
LMX2571Low-Power,High-PerformancePLLatinum™RFSynthesizer
withFSKModulation
1
1Features
1
•AnyFrequencyfrom10MHzto1344MHz
•LowPhaseNoiseandSpurs
––123dBc/Hzat12.5kHzOffsetat480MHz
––145dBc/Hzat1MHzOffsetat480MHz
–NormalizedPLLNoiseFloorof–231dBc/Hz
–SpuriousBetterThan–75dBc/Hz
•NewFastLocktoReduceLockTime
•ANovelTechniquetoRemoveIntegerBoundary
Spurs
•Integrated5-VChargePumpandOutputDivider
forExternalVCOOperation
•2-,4-and8-LevelorArbitraryLevelDirectDigital
FSKModulation
•OneTX/RXOutputorTwoFanoutOutputs
•Crystal,XOorDifferentialReferenceClockInput
•LowCurrentConsumption
–39-mATypicalSynthesizerMode(Internal
VCO)
–9-mATypicalPLLMode(ExternalVCO)
•24-BitFractional-NDeltaSigmaModulator
2Applications
•DuplexModeDigitalProfessional2-WayRadio
–dPMR,DMR,PDT,P25PhaseI
•LowPowerRadioCommunicationSystems
–SatcomModem
–WirelessMicrophone
–ProprietyWirelessConnectivity
•HandheldTestandMeasurementEquipment
3Description
TheLMX2571isalow-power,high-performance,
widebandPLLatinum™RFsynthesizerthat
integratesadelta-sigmafractionalNPLL,multiple
corevoltage-controlledoscillator(VCO),
programmableoutputdividersandtwooutputbuffers.
TheVCOcoresworkupto5.376GHzresultingin
continuousoutputfrequencyrangeof10MHzto
1344MHz.
Thissynthesizercanalsobeusedwithanexternal
VCO.Tothatend,adedicated5-Vchargepumpand
anoutputdividerareavailableforthisconfiguration.
Auniqueprogrammablemultiplierisalso
incorporatedtohelpimprovespurs,allowingthe
systemtouseeverychannelevenifitfallsonan
integerboundary.
TheoutputhasanintegratedSPDTswitchthatcan
beusedasatransmit/receiveswitchinFDDradio
application.Bothoutputscanalsobeturnedonto
provide2outputsatthesametime.
TheLMX2571supportsdirectdigitalFSKmodulation
throughprogrammingorpins.DiscretelevelFSK,
pulseshapingFSK,andanalogFMmodulationare
supported.
AnewFastLocktechniquecanbeusedallowingthe
usertostepfromonefrequencytothenextinless
than1.5msevenwhenanexternalVCOisusedwith
anarrowbandloopfilter.
DeviceInformation
(1)
PARTNUMBERPACKAGEBODYSIZE(NOM)
LMX2571WQFN(36)6.00mm×6.00mm
(1)Forallavailablepackages,seetheorderableaddendumat
theendofthedatasheet.
SimplifiedSchematic
Product specificaties
| Merk: | Texas Instruments |
| Categorie: | Niet gecategoriseerd |
| Model: | LMX2571 |
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