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參數(shù)資料
| 型號(hào)： | RF25A |
| 英文描述： | RF25A for CDMA. and AMPS Applications |
| 中文描述： | RF25A用于CDMA。和AMPS應(yīng)用 |
| 文件頁數(shù)： | 3/17頁 |
| 文件大?。?/td> | 434K |
| 代理商： | RF25A |
RxASIC
RF25A
101110A
August4, 2000
Conexant–Preliminary
ProprietaryInformation
3
TechnicalDescription
LowNoiseAmplifier(LNA)
.TheLNAisdesignedwithahigh
gain, lownoisefigure, andhigh3
rd
orderinputintercept(IIP3)
performance.Theseparameterscanbeoptimzedwiththe
mxergain, noisefigure, andIIP3toachievethecascadeNF
andIIP3systemrequirements.RF25Apin2isLNAdecoupled,
requiringaRF bypasscapacitortogroundwithmnimaltrace
length.Inputandoutputmatchingnetworksareexternaltothe
RxASIC.
Mxers
.Theactivedoublebalancedmxerisdesignedforhigh
gain, alownoisefigure, andhighIIP3performance.Themxer
canalsobeoptimzedforRF performancetocomplementthe
LNARF performance, andsatisfyoverallRxNF andIIP3system
requirements.TheLOportoperateswithatypicalLOdrivelevel
of-10dBmThemxerhasabalancedoutputtodrivetheIF
SAWfilterinCDMAmode, andsingle-endedoutputtodrivethe
IF SAWfilterintheAMPS mode.
VariableGainAmplifier(VGA).
Thehighdynamcrange
requiredbyaCDMAhandsetisachievedbytheVGA, whichhas
amnimumdynamcrangeof90dBandacontrolvoltagerange
from0.5to2.5V.TheVGAiscommoninbothmodes(CDMA
andAMPS) byswitchingitsinternalinputbuffers.
I/QDemodulator
.TheI/QDemodulatorisdesignedformobile
handsetapplication.Ithasanon-chipgeneratedVHF LOwitha
typicaloperatingrangeof100to600MHzandatypicalI/Q
outputoperatingrangeof0to5MHz.TheI/QDemodulatoris
internallyconnectedtotheVGAoutput, andisfullydifferentialto
reducecommonmodenoise.DC offsetsbetweendifferentialI/Q
outputs, andbetweenIandQchannels, areextremelylowto
facilitatecompatibilitywithbasebandinterfaces.The
I/QDemodulatorisalsodesignedtohaveverylowamplitude
andphaseimbalance.
VHF Oscillator
.Withexternaltankcircuits, theVCOprovides
theLOsignaltodrivethedemodulator, andtheprescalerofan
externalPhaseLockedLoop(PLL).Theoscillatorcanoperate
attwoorfourtimesattwicetheIF frequency.Usingaselectable
divideratio, theLOfortheI/Qdemodulatorisderived.Thelogic
signaltoselectthedividerratio(2or4) isavailableonPin13
(DIV2/DIV4).
ModeControl
.Theoperationofthechipiscontrolledbysignals
atPin7(FM/CDMA), Pin20(SLEEP), andPin13(DIV2/DIV4).
Alltheswitchingisdoneinternally.Thesupplyvoltageshouldbe
presentatalltheVCC pinsfornormaloperation.Themodes
selectedareshowninTable4.
ElectricalandMechanicalSpecifications
IncludedinthisdocumentareTables1through5andFigures1
through4, whichdefineandillustratetheelectricaland
mechanicalspecificationsoftheRF25A.
Table1:
RF25APinAssignmentsandSignal
Descriptions
Table2:
AbsoluteMaximumRatings
Table3:
RecommendedOperatingConditions
Table4:
ModeControlSelectSignalSwitching
Table5:
RF25ARX ASIC ElectricalSpecifications
Figure1:
RF25ARxASIC Pin-out-40-PinLGA
6x6mmPackage
Figure2:
RF25ARxASIC BlockDiagram
Figure3–19: TypicalFunctionalBlockPerformance
Figure20:
RF25ASchematicDiagram
Figure21:
RF25APackageDimensions–40-PinLGA
6x6mmPackage
Figure22:
40-PinLGATapeandReelDimensions
ESDSensitivity
TheRF25AisaClass1device.Thefollowingextreme
ElectrostaticDischarge(ESD) precautionsarerequired
accordingtotheHumanBodyModel(HBM):
Protectiveoutergarments.
HandledeviceinESDsafeguardedworkarea.
TransportdeviceinESDshieldedcontainers.
MonitorandtestallESDprotectionequipment.
TheHBMESDwithstandthresholdvalue, withrespectto
ground, is
±
1.5kV.TheHBMESDwithstandthresholdvalue,
withrespecttoVDD(thepositivepowersupplytermnal) isalso
±
1.5kV.
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