Texas Instruments LMX2581 Bruksanvisning
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Charge
Pump
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DATA
CLK
LE
CE
OSCin
Vtune
CPout
LD
Output
Divider
Fractional
N Divider
2X
MUX
Serial Interface
Control
RFin
R
Divider
RFoutA
MUX
RFoutB
Multiple
Core VCO
MUX
MUX
MUXout
Vcc
Vcc
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LMX2581
SNAS601G–AUGUST2012–REVISEDSEPTEMBER2014
LMX2581WidebandFrequencySynthesizerwithIntegratedVCO
1Features3Description
TheLMX2581isalownoisewidebandfrequency
1
•OutputFrequencyfrom50to3760MHz
synthesizerthatintegratesadelta-sigmafractionalN
•InputClockFrequencyupto900MHz
PLL,multiplecoreVCO,programmableoutput
•PhaseDetectorFrequencyupto200MHz
divider,andtwodifferentialoutputbuffers.TheVCO
frequencyrangeisfrom1880to3760MHzandcan
•SupportsFractionalandIntegerModes
besentdirectlytotheoutputbuffersordivideddown
•–229dBc/HzNormalizedPLLPhaseNoise
byevenvaluesfrom2to38.Eachbufferiscapable
•–120.8dBc/HzNormalizedPLL1/fNoise
ofoutputpowerfrom-3to+12dBmat2700MHz.
IntegratedlownoiseLDOsareusedforsuperior
•–137dBc/HzVCOPhaseNoise@1MHzoffset
noiseimmunityandconsistentperformance.
fora2.5GHzCarrier
•100fsRMSJitterinIntegerMode
Thissynthesizerisahighlyprogrammabledeviceand
itenablestheusertooptimizeitsperformance.In
•ProgrammableFractionalModulatorOrder
fractionalmode,thedenominatorandthemodulator
•ProgrammableFractionalDenominator
orderareprogrammableandcanbeconfiguredwith
•ProgrammableOutputPowerupto+12dBm
ditheringaswell.Theuseralsohastheabilityto
directlyspecifyaVCOcoreorentirelybypassthe
•Programmable32LevelChargePumpCurrent
internalVCO.Finally,manyconvenientfeaturesare
•ProgrammableOptiontoUseanExternalVCO
includedsuchaspowerdown,Fastlock,automute,
•DigitalLockDetect
andlockdetection.Allregisterscanbeprogrammed
•3-WireSerialInterfaceandReadback
throughasimple3wireinterfaceandareadback
featureisalsoavailable.
•SingleSupplyVoltagefrom3.15Vto3.45V
•SupportsLogicLevelsdownto1.6V
TheLMX2581operatesonasingle3.3Vsupplyand
comesina32pin5.0mm×5.0mmWQFNpackage.
2Applications
DeviceInformation
(1)
•WirelessInfrastructure(UMTS,LTE,WiMax,
PARTNUMBERPACKAGEBODYSIZE(NOM)
Multi-StandardBaseStations)
LMX2581WQFN(32)5.00mm×5.00mm
•BroadbandWireless
(1)Forallavailablepackages,seetheorderableaddendumat
•TestandMeasurement
theendofthedatasheet.
•ClockGeneration
4SimplifiedSchematic
1
AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,
intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.
Produktspecifikationer
| Varumärke: | Texas Instruments |
| Kategori: | ej kategoriserat |
| Modell: | LMX2581 |
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