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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(yè)數(shù)： | 1/17頁(yè) |
| 文件大小： | 434K |
| 代理商： | RF25A |
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DataSheet
Conexant–Preliminary
ProprietaryInformation
Doc.No.101110A
August4, 2000
RF25A
RF25A for CDMA, and AMPS Applications
TheRF25Adeviceincludesthefollowingfunctionalblocks:
LowNoiseAmplifier(LNA)
RF DownconvertedMxer
IntermediateFrequency(IF) VariableGainAmplifier(VGA)
In-PhaseandQuadrature(I/Q) Demodulator
VoltageControlledOscillator(VCO)
TheRF25AApplication-SpecificIntegratedCircuit(ASIC) isadual-mode, single-
bandreceiver(Rx) intendedforuseinCodeDivisionMultipleAccess(CDMA)
portablephonesinthecellularband.ItcanbeusedinCDMAmodeorAdvanced
MobilePhoneSystem(AMPS) mode.TheASIC providesexcellentRF
performancewithlowDC powerdissipationandisassembledinalowcost, high
performance, 40-pinLandGridArray(LGA) 6x6mmpackage.
Thedeviceincorporatesallthecomponentsrequiredtoimplementthecomplete
dual-modereceiverfrontend;fromtheLowNoiseAmplifier(LNA) totheIn-Phase
andQuadrature(I/Q) demodulatorstages, exceptforexternalSAWfilters.TheLNA
amplifiestheincomngsignalandoutputstoanexternalSAWfilter.Afterfiltering,
thesignalgoestothemxerfordownconversion.ThemxeroutputfortheAMPS
modeissingle-ended, followedbytheexternalAMPS IntermediateFrequency(IF)
SurfaceAcousticWave(SAW) filter.ThemxeroutputfortheCDMAmodemxer
hasbalancedoutputsforexternalIF SAWfiltering.TheIF SAWfiltersarefollowed
byaVariableGainAmplifier(VGA) andandI/Qdemodulator.Themodeselection
iscontrolledbyamodecontrolpin.
TheIF filteroutputsarebufferedattheinputoftheVGA, whichhasadynamc
rangegreaterthan90dB.
Theon-chipVeryHighFrequency(VHF) VoltageControlledOscillators(VCO)
operateswithanexternaltankcircuittoprovidetheLocalOscillator(LO) signalfor
theI/Qdemodulator.
TheGain, NoiseFigure(NF), andthirdorderInputIntercept(IIP3) ofeachstagein
thereceiverchipareoptimzedtomeetthesystemrequirementsforAMPS and
CDMAmodesaccordingtotheTIA/EIA98-Bstandard.Employingsiliconbipolar
technology, theASIC isdesignedforhighperformancewithahighlevelof
integrationandprovidesacost-effectiveRF solutionfordual-modephone
applications
TheRF25Apin-outisshowninFigure1, afunctionalblockdiagramisillustratedin
Figure2, andaschematicdiagraminFigure3.
Features
Dual-ModeOperation
Batteryoperation2.7to3.6V
Highlevelofintegration
DifferentialI/Qoutputsforbasebandinterfaces
On-chip100to600MHzVCO
LowDC consumption:<60mA
40-pinLandGridArray(LGA)6x6mmpackage
Applications
CDMAandAMPS handsetinthecellularband:
AMPS
CDMA(US)
CDMA(Japan)
Figure1.RF25A RxASIC Pin-out
40-PinLGA Package
C506
NC
LNA_DECOUPLE
NC
LNA_IN
VCC_RFBIAS
BIAS_SET
FM/CDMA
VCC_VCO
GND
TANK-
TANK+
31
30
29
28
27
26
25
24
23
22
21
N
D
P
Q
Q
S
P
I
I
4
3
3
3
3
3
3
3
3
N
L
N
V
N
L
M
I
M
1
1
1
1
1
2
1
1
1
NC
NC
AMPS_MIXEROUT
CDMA_MIXEROUT-
CDMA_MIXEROUT+
MIX_BYPASS
VGA_AMPS_IN
VGA_CDMA_IN-
VGA_CDMA_IN+
VCC_IF
VGA_CONTROL
1
2
3
4
5
6
7
8
9
10
11
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