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參數(shù)資料
| 型號(hào)： | RF25K-11 |
| 英文描述： | QUADRATURE DEMODULATOR|BIPOLAR|LLCC|48PIN|PLASTIC |
| 中文描述： | 正交解調(diào)器|雙極| LLCC | 48PIN |塑料 |
| 文件頁(yè)數(shù)： | 1/10頁(yè) |
| 文件大?。?/td> | 312K |
| 代理商： | RF25K-11 |
DataSheet
Premliminary–ConexantSystems, Inc.
Doc.No.101249A
August24, 2000
RF25K
Rx ASIC for CDMA, AMPS, and PCS Applications
TheRF 25Kdeviceincludesthefollowingfunctionalblocks:
CellularLow-NoiseAmplifier
CellularandPCS Downconverters
IF VariableGainAmplifier
In-PhaseandQuadrature(I/Q) Demodulator
CellularandPCS VHLVoltage-ControlledOscillators
TheRF25KApplication-SpecificIntegratedCircuit(ASIC) isatriple-mode, dual-
bandreceiver(Rx) inaLandGridArray(LGA) package;intendedforuseinCode
DivisionMultipleAccess(CDMA) portablephonesinboththecellularandPersonal
CommunicationsSystem(PCS) bands.AsadualmodeIC, itcanbeusedeitherin
CDMAmodeorAdvancedMobilePhoneSystem(AMPS) mode.
Thedeviceincorporatesallthecomponentsrequiredtoimplementthecomplete
Dual-Band, Tri-Modereceiverfrontend;fromtheLowNoiseAmplifier(LNA) toIn-
PhaseandQuadrature(I/Q) demodulatorstages, exceptforfiltersandthePCS
LNA.InadditiontothecellularbandLNA, thereareseparatemxersfortheAMPS,
CDMA800MHz, andPCS bands.TheAMPS mxeroutputissingle-ended,
followedbytheexternalAMPS IntermediateFrequency(IF) SurfaceAcousticWave
(SAW) filter.ThecellularandPCS mxershavebalancedoutputsforexternalIF
SAWfiltering.TheIF SAWfiltersarefollowedbyaVariableGainAmplifier(VGA)
andanI/Qdemodulator.
TheIF filteroutputsarebufferedattheinputoftheVGA, whichareenabled
dependingontheselectedmode.TheVGAhasadynamcrangegreaterthan90
dB, andcommonstageforallmodes.
Therearetwoon-chipVeryHighFrequency(VHF) VoltageControlOscillators
(VCO), whichoperatewithexternaltankcircuitstoprovidetheLocalOscillator(LO)
signalsfortheI/Qdemodulator.
TheNoiseFigure, Gain, andThirdOrderInputInterceptPoint(IIP3) ofeachstage
inthereceiverchipareoptimzedtomeetthesystemrequirementsforAMPS and
CDMAmodesasperTIA/EIA-98-BandANSIJ-STD-018(PCS).Employingsilicon
bipolartechnology, theASIC isdesignedforhighperformancewithahighlevel
integrationandacost-effectiveRF solutionfordual-band, tri-modephone
application.
ThedevicepackageandpinoutareshowninFigure1.Ablockdiagramofthe
RF25KisshowninFigure2.
Features
SupportsDual-Band, Tri-Mode
Batterycelloperation(2.7V to3.0V)
Higherlevelofintegration
I/Qdifferentialoutputsforbasebandinterfaces
On-chip100to640MHzVCOs
Lowpoweroperation:<60mA
48-pinLandGridArray(LGA)7x7mmpackage
Applications
Tri-modephone
Inthecellularband:
– AMPS
– CDMA(US)
– CDMA(Japan)
InthePCS band:
– PCS (US)
– PCS (Korean)
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