Texas Instruments LMX2485Q-Q1 Handleiding
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VddRF5
Phase
Comp
FinIF
Charge
Pump
CPoutIF
Ftest/LD
MUX
Ftest/LD
IF
LD
Phase
Comp
8/9
or
16/17
Prescaler
B Counter
IF N Divider
A Counter
FLoutRF
VddIF2
VddIF1
RF NDivider
GND
GND
GND
FinRF
FinRF*
8/9/12/13
or
16/17/20/21
Prescaler
C Counter
6'
Compensation
A Counter
B Counter
RF N Divider
ENOSC
OSCout
OSCin
VddRF4
VddRF3
VddRF2
VddRF1
IF R
Divider
RF R
Divider
1X / 2X
RF LD
Charge
Pump
CPoutRF
RF Fastlock
MICROWIRE
Interface
CLK
LE
DATA
CE
Product
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AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,
intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.
LMX2485Q-Q1
SNOSCP7A–MARCH2013–REVISEDJANUARY2016
LMX2485Q-Q1500MHz-3.1GHzHighPerformanceDelta-SigmaLowPowerDual
PLLatinum™FrequencySynthesizersWith800-MHzIntegerPLL
1
1Features
1
•QuadrupleModulusPrescalerforLowerDivides
–RFPLL:8/9/12/13or16/17/20/21
–IFPLL:8/9or16/17
•AdvancedDeltaSigmaFractionalCompensation
–12-Bitor22-BitSelectableFractionalModulus
–Upto4thOrderProgrammableDelta-Sigma
Modulator
•ImprovedLockTimesandProgramming
–Fastlock/CycleSlipReductionRequiringOnly
aSingle-WordWrite
–IntegratedTime-OutCounter
•WideOperatingRange
–LMX2485Q-Q1RFPLL:500MHzto3.1GHz
•UsefulFeatures
–DigitalLockDetectOutput
–HardwareandSoftwarePower-DownControl
–On-ChipInputFrequencyDoubler
–RFPhaseDetectorFrequencyUpto50MHz
–2.5-Vto3.6-VOperationWithI
CC
=5.0mA
–LMX2485Q-Q1isAEC-Q100Grade2
QualifiedandisManufacturedonan
AutomotiveGradeFlow
2Applications
•CellularPhonesandBaseStations
•DirectDigitalModulationApplications
•SatelliteandCableTVTuners
•WLANStandards
3Description
TheLMX2485Q-Q1isalowpower,highperformance
delta-sigmafractional-NPLLwithanauxiliaryinteger-
NPLL.ThedeviceisfabricatedusingTI’sadvanced
process.
Withdelta-sigmaarchitecture,fractionalspursat
loweroffsetfrequenciesarepushedtohigher
frequenciesoutsidetheloopbandwidth.Theabilityto
pushcloseinspurandphasenoiseenergytohigher
frequenciesisadirectfunctionofthemodulator
order.Unlikeanalogcompensation,thedigital
feedbacktechniqueusedintheLMX2485Q-Q1is
highlyresistanttochangesintemperatureand
variationsinwaferprocessing.TheLMX2485Q-Q1
delta-sigmamodulatorisprogrammableuptofourth
order,whichallowsthedesignertoselectthe
optimummodulatorordertofitthephasenoise,spur,
andlocktimerequirementsofthesystem.
SerialdataforprogrammingtheLMX2485Q-Q1is
transferredthroughathree-line,high-speed(20-MHz)
MICROWIREinterface.TheLMX2485Q-Q1offers
finefrequencyresolution,lowspurs,fast
programmingspeed,andasinglewordwriteto
changethefrequency.Thismakesitidealfordirect
digitalmodulationapplications,wheretheN-counter
isdirectlymodulatedwithinformation.The
LMX2485Q-Q1isavailableina24-lead4.0×4.0×
0.8mmWQFNpackage.
DeviceInformation
(1)
PARTNUMBERPACKAGEBODYSIZE(NOM)
LMX2485Q-Q1WQFN(24)4.00mm×4.00mm
(1)Forallavailablepackages,seetheorderableaddendumat
theendofthedatasheet.
FunctionalBlockDiagram
Product specificaties
| Merk: | Texas Instruments |
| Categorie: | Niet gecategoriseerd |
| Model: | LMX2485Q-Q1 |
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