Texas Instruments LMX2486 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
RFN Divider
GND
GND
GND
FinRF
FinRF*
16/17/20/21
or
32/33/36/37
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
Folder
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LMX2486
SNAS324B–JANUARY2006–REVISEDJANUARY2016
LMX24861-GHzto4.5-GHzHigh-PerformanceDelta-SigmaLow-PowerDualPLLatinum™
FrequencySynthesizersWith3-GHzIntegerPLL
1
1Features
•QuadrupleModulusPrescalerforLowerDivids3Description
TheLMX2486deviceisalow-power,high
–RFPLL:16/17/20/21or32/33/36/37
performancedelta-sigmafractional-NPLLwithan
–IFPLL:8/9or16/17
auxiliaryinteger-NPLL.Thedeviceisfabricated
•AdvancedDeltaSigmaFractionalCompensation
usingTI’sadvancedprocess.
–12-Bitor22-BitSelectableFractionalModulus
Withdelta-sigmaarchitecture,fractionalspursat
–Upto4thOrderProgrammableDelta-Sigma
loweroffsetfrequenciesarepushedtohigher
Modulator
frequenciesoutsidetheloopbandwidth.Theabilityto
pushcloseinspurandphasenoiseenergytohigher
•ImprovedLockTimesandProgramming
frequenciesisadirectfunctionofthemodulator
–Fastlock/CycleSlipReductionWhich
order.Unlikeanalogcompensation,thedigital
RequiresOnlyaSingle-WordWrite
feedbacktechniqueusedintheLMX2486ishighly
–IntegratedTime-OutCounter
resistanttochangesintemperatureandvariationsin
waferprocessing.TheLMX2486delta-sigma
•WideOperatingRange
modulatorisprogrammableuptofourthorder,which
–LMX2486RFPLL:1.0GHzto4.5GHz
allowsthedesignertoselecttheoptimummodulator
•UsefulFeatures
ordertofitthephasenoise,spur,andlocktime
requirementsofthesystem.
–DigitalLockDetectOutput
–HardwareandSoftwarePower-DownControl
SerialdataforprogrammingtheLMX2486is
transferredthroughathree-line,high-speed(20-MHz)
–On-ChipCrystalReferenceFrequencyDoubler
MICROWIREinterface.TheLMX2486offersfine
–RFPhaseDetectorFrequencyUpto50MHz
frequencyresolution,lowspurs,fastprogramming
–2.5-Vto3.6-VOperationWithI
CC
=8.5mA
speed,andasingle-wordwritetochangethe
frequency.Thismakesitidealfordirectdigital
2Applications
modulationapplications,wheretheN-counteris
directlymodulatedwithinformation.TheLMX2486is
•CellularPhonesandBaseStations
availableina24-lead4.0×4.0×0.8mmWQFN
•DirectDigitalModulationApplications
package.
•SatelliteandCableTVTuners
DeviceInformation
(1)
•WLANStandards
PARTNUMBERPACKAGEBODYSIZE(NOM)
LMX2486WQFN(24)4.00mm×4.00mm
(1)Forallavailablepackages,seetheorderableaddendumat
theendofthedatasheet.
FunctionalBlockDiagram
1
AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,
intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.
Product specificaties
| Merk: | Texas Instruments |
| Categorie: | Niet gecategoriseerd |
| Model: | LMX2486 |
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