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參數資料
| 型號： | RF25A |
| 英文描述： | RF25A for CDMA. and AMPS Applications |
| 中文描述： | RF25A用于CDMA。和AMPS應用 |
| 文件頁數： | 4/17頁 |
| 文件大?。?/td> | 434K |
| 代理商： | RF25A |
RF25A
RxASIC
4
Conexant–Preliminary
.
ProprietaryInformation
1011110A
August4, 2000
Table1.RF25A PinAssignments andSignalDescriptions (1of3)
Pin#
Name
Description
EquivalentCircuit
1
NC
Noconnection.
2
LNA_DECOUPLE
AnRF bypasscapacitor(1000pF)withveryshorttraceshouldbeconnectedtothispin.
3
NC
Noconnection
4
LNA_IN
TheinputtoLNAneedsexternalmatching.Thematchingnetworkshouldbeplacedasclose
tothispinaspossible.HighQcomponentsarerecommendedtomnimzetheeffectonthe
noisefigure.ADC blockingcapacitorisnecessaryattheinput.
5
VCC_RFBIAS
SupplyvoltagetotheRF bias.AnRF bypasscapacitorshouldbeconnectedfromthepinto
groundwithshorttraces.
6
BIAS_SET
ThispinsetsthecellularRF biascurrent.Typically,a180
resistorisconnectedfromthepin
toground.
7
FM/CDMA
Cellularbandmodeselect:0=AMPS;1=CDMA.
8
VCC_VCO
VoltagesupplypintotheVCObuffer.Abypasscapacitorshouldbeplacedclosetothedevice
frompin8topin9.Thetraceshouldbeshortandconnectedimmediatelytothegroundplane
forbestperformance.
9
GND
GroundreturnfromtheVCObuffer.
10
TANK-
DifferentialtankconnectionforthecellularbandVCO.Careshouldbetakenduringthelayout
oftheexternaltankcircuittopreventparasiticoscillations.
11
TANK+
DifferentialtankconnectionforthecellularbandVCO.Careshouldbetakenduringthelayout
oftheexternaltankcircuittopreventparasiticoscillations.
–
+
12
NC
Noconnection.
13
DIV2/DIV4
SelectsthedivideratiooftheVCOtotheLOportoftheI/Qdemodulator:0=divideby2,
1=divideby40.
14
PLL+
DifferentialbufferedVCOoutput
15
PLL-
DifferentialbufferedVCOoutput
–
+
Vcc
Vcc
16
I+
Ichanneldifferentialoutput.
17
I-
Ichanneldifferentialoutput.
18
Q+
Qchanneldifferentialoutput.
19
Q-
Qchanneldifferentialoutput.
20
SLEEP
Activatessleepmode:0=sleep;1=enable
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