107.0cc

ApplicationNoteAN094UsingtheCC1190FrontEndwithCC1101underEN300220ByCharlotteSeem,MariusUbostadandSverreHellanKeywordsRangeExtenderEN300220ExternalPAExternalLNACC1101CC430CC1100CC1110CC1111CC11901IntroductionTheCC1101isatrulylow-cost,highlyintegratedandveryflexibleRFtransceiver.
TheCC1101isprimarilydesignedforuseinlow-powerapplicationsinthe315,433,868and915MHzSRD/ISMbands.
TheCC1190isarangeextenderfor850-950MHzRFtransceivers,transmitters,andSystem-on-ChipdevicesfromTexasInstruments.
Itincreasesthelinkbudgetbyprovidingapoweramplifier(PA)forincreasedoutputpower,andalow-noiseamplifier(LNA)withlownoisefigureforimprovedreceiversensitivityinadditiontoswitchesandRFmatchingforsimpledesignofhighperformancewirelesssystems.
ThisapplicationnoteoutlinestheexpectedperformancewhenusingaCC1101-CC1190designunderEN300220-1V2.
3.
1[4]inthe869.
4-869.
65MHzfrequencysub-band(g3).
Themaximumallowedoutputpowerinthe869.
4-869.
65MHzsub-bandis+27dBm(500mW),butduetotheCC1101phasenoisethemaximumoutputpowerusingtheCC1101-CC1190EM869MHzreferencedesign[3]isapproximately+18dBminordertomeetmodulationbandwidthrequirements.
Thefinaloutputpowerlevelwilldependontheantennabeingused.
Fordetailsontheregulatorylimitsinthe863-870MHzSRDfrequencybands,pleaserefertotheETSIEN300220-1V2.
3.
1[4]andERCRecommendation70-03[5].
Thesecanbedownloadedfromwww.
etsi.
organdwww.
ero.
dk.
TheapplicationnoteisalsoapplicableforCC1100,CC1110,CC1111,andCC430whenusedwiththeCC1190astheyusethesameradioastheCC1101.
ThisapplicationnoteassumesthereaderisfamiliarwithCC1101andEN300220.
Thereaderisreferredto[2]and[4]fordetails.
SWRA356Page1of22ApplicationNoteAN094TableofContentsKEYWORDS.
11INTRODUCTION.
12ABBREVIATIONS.
23ABSOLUTEMAXIMUMRATINGS.
34ELECTRICALSPECIFICATIONS34.
1OPERATINGCONDITIONS.
34.
2CURRENTCONSUMPTION34.
3RECEIVEPARAMETERS44.
3.
1TypicalRXPerformanceCurves54.
3.
2ReceivedSignalStrengthIndicator(RSSI)114.
3.
3ListenBeforeTalk(LBT)Threshold.
124.
4TRANSMITPARAMETERS134.
4.
1TypicalTXPerformanceCurves145MEASUREMENTEQUIPMENT.
186CONTROLLINGTHECC1190187CC1101REGISTERSETTINGS.
198SMARTRFSTUDIOANDSMARTRF04EB/TRXEB198.
1SMARTRFSTUDIO198.
2SMARTRF04EB/TRXEB209REFERENCEDESIGN219.
1POWERDECOUPLING219.
2INPUT/OUTPUTMATCHINGANDFILTERING.
219.
3BIASRESISTOR.
219.
4CRYSTAL219.
5SAWFILTER219.
6PCBLAYOUTCONSIDERATIONS2110DISCLAIMER.
2211REFERENCES.
2212GENERALINFORMATION2212.
1DOCUMENTHISTORY.
222AbbreviationsAFAAdaptiveFrequencyAgilityEBEvaluationBoardEIRPEquivalentIsotropicallyRadiatedPowerEMEvaluationModuleHGMHighGainModeLBTListen-before-TalkLNALowNoiseAmplifierLGMLowGainModePAPowerAmplifierPCBPrintedCircuitBoardPERPacketErrorRateRFRadioFrequencyRSSIReceiveSignalStrengthIndicatorRXReceive,ReceiveModeSoCSystem-on-ChipTrxEBSmartRFTransceiverEBTXTransmit,TransmitModeSWRA356Page2of22ApplicationNoteAN0943AbsoluteMaximumRatingsTheabsolutemaximumratingsandoperatingconditionslistedintheCC1101datasheet[1]andtheCC1190datasheet[2]mustbefollowedatalltimes.
Stressexceedingoneormoreoftheselimitingvaluesmaycausepermanentdamagetoanyofthedevices.
4ElectricalSpecificationsNotethatthecharacteristicsinChapter4areonlyvalidwhenusingtherecommendedregistersettingspresentedinChapter7andtheCC1101-CC1190EM869MHzreferencedesign[3].
4.
1OperatingConditionsParameterMinMaxUnitOperatingFrequency850950MHzOperatingSupplyVoltage2.
03.
6VOperatingTemperature-40+85°CTable4.
1.
OperatingConditions4.
2CurrentConsumptionTC=25°C,VDD=3.
0V,f=869.
525MHzifnothingelseisstated.
AllparametersaremeasuredontheCC1101-CC1190EM869MHzreferencedesign[3]witha50load.
ParameterConditionTypicalUnit1.
2kbps20mA4.
8kbps20mAReceiveCurrent,HGM38.
4kbps20mA1.
2kbps17mA4.
8kbps17mAReceiveCurrent,LGM38.
4kbps17mATransmitCurrent1PATABLE=0x54(+20dBm)PATABLE=0x55(+19dBm)PATABLE=0x57(+18dBm)PATABLE=0x36(+17dBm)PATABLE=0x28(+16dBm)PATABLE=0x27(+15dBm)13813212011210499mAPowerDownCurrent250nATable4.
2.
CurrentConsumption1TheRFoutputpoweroftheCC1101–CC1190iscontrolledbythe8bitvalueintheCC1101PATABLEregister.
ThepowersettingsareasmallsubsetofallthepossiblePATABLEregistersettings.
SWRA356Page3of22ApplicationNoteAN0944.
3ReceiveParametersTC=25°C,VDD=3.
0V,f=869.
525MHzifnothingelseisstated.
AllparametersaremeasuredontheCC1101-CC1190EM869MHzreferencedesign[3]witha50load.
ParameterConditionTypicalUnit1.
2kbps,GFSK,±14.
8kHzdeviation,60kHzRXfilterbandwidth.
SeeFigure4.
1.
-118dBm1.
2kbps,GFSK,±4.
9kHzdeviation,60kHzRXfilterbandwidth.
SeeFigure4.
1.
-115dBm4.
8kbps,GFSK,±24.
7kHzdeviation,105kHzRXfilterbandwidth.
SeeFigure4.
2.
-113dBmSensitivity2,HGM38.
4kbps,GFSK,±19.
8kHzdeviation,105kHzRXfilterbandwidth.
SeeFigure4.
3.
-108dBm1.
2kbps,GFSK,±14.
8kHzdeviation,60kHzRXfilterbandwidth.
SeeFigure4.
4.
-104dBm1.
2kbps,GFSK,±4.
9kHzdeviation,60kHzRXfilterbandwidth.
SeeFigure4.
4.
-101dBm4.
8kbps,GFSK,±24.
7kHzdeviation,105kHzRXfilterbandwidth.
SeeFigure4.
5.
-99dBmSensitivity,LGM38.
4kbps,GFSK,±19.
8kHzdeviation,105kHzRXfilterbandwidth.
SeeFigure4.
6.
-94dBmSaturation,HGMMaximuminputpowerlevelfor1%PER-23dBmSaturation,LGMMaximuminputpowerlevelfor1%PER-6dBm1.
2kbps.
60kHzRXfilterbandwidthWantedsignal3dBand16dBabovethesensitivitylevel.
Unmodulatedinterferer.
SeeFigure4.
7.
±2MHzfromwantedsignal3±10MHzfromwantedsignal46083dB4.
8kbps.
105kHzRXfilterbandwidth.
Wantedsignal3dBand16dBabovethesensitivitylevel.
Unmodulatedinterferer.
SeeFigure4.
8.
±2MHzfromwantedsignal±10MHzfromwantedsignal5580dBSelectivityandBlocking,HGMandLGM38.
4kbps.
105kHzRXfilterbandwidth.
Wantedsignal3dBand16dBabovethesensitivitylevel.
Unmodulatedinterferer.
SeeFigure4.
9.
±2MHzfromwantedsignal±10MHzfromwantedsignal5580dBSpuriousemission5,HGMConductedmeasurementbelow1GHzConductedmeasurementabove1GHzRadiatedVCOleakage(SeeFigure4.
10)CC1101-CC1190EM869MHzreferencedesign[3]witha50load.
-121.
0-120.
0-119.
0-118.
0-117.
0-116.
0-115.
0-114.
0-113.
0-112.
0-111.
0-40-30-20-1001020304050607080Temperature[C]Sensitivity[dBm]1.
2kbps,14.
3kHzdev,2V1.
2kbps,14.
3kHzdev,3V1.
2kbps,14.
3kHzdev,3.
6V1.
2kbps,4.
9kHzdev,2V1.
2kbps,4.
9kHzdev,3V1.
2kbps,4.
9kHzdev,3.
6VFigure4.
1.
TypicalSensitivityvs.
TemperatureandPowerSupplyVoltage,HGM,1.
2kbps-115.
0-114.
0-113.
0-112.
0-111.
0-110.
0-109.
0-40-30-20-1001020304050607080Temperature[C]Sensitivity[dBm]4.
8kbps,2V4.
8kbps,3V4.
8kbps,3.
6VFigure4.
2.
TypicalSensitivity2vs.
TemperatureandPowerSupplyVoltage,HGM,4.
8kbpsSWRA356Page5of22ApplicationNoteAN094-110.
0-109.
0-108.
0-107.
0-106.
0-105.
0-104.
0-40-30-20-1001020304050607080Temperature[C]Sensitivity[dBm]38.
4kbps,2V38.
4kbps,3V38.
4kbps,3.
6VFigure4.
3.
TypicalSensitivity2vs.
TemperatureandPowerSupplyVoltage,HGM,38.
4kbps-108.
0-106.
0-104.
0-102.
0-100.
0-98.
0-96.
0-40-30-20-1001020304050607080Temperature[C]Sensitivity[dBm]1.
2kbps,14.
3kHzdev,2V1.
2kbps,14.
3kHzdev,3V1.
2kbps,14.
3kHzdev,3.
6V1.
2kbps,4.
9kHzdev,2V1.
2kbps,4.
9kHzdev,3V1.
2kbps,4.
9kHzdev,3.
6VFigure4.
4.
TypicalSensitivity2vs.
TemperatureandPowerSupplyVoltage,LGM,1.
2kbpsSWRA356Page6of22ApplicationNoteAN094-102.
0-101.
0-100.
0-99.
0-98.
0-97.
0-96.
0-95.
0-94.
0-40-30-20-1001020304050607080Temperature[C]Sensitivity[dBm]4.
8kbps,2V4.
8kbps,3V4.
8kbps,3.
6VFigure4.
5.
TypicalSensitivity2vs.
TemperatureandPowerSupplyVoltage,LGM,4.
8kbps-96.
0-95.
0-94.
0-93.
0-92.
0-91.
0-90.
0-89.
0-88.
0-40-30-20-1001020304050607080Temperature[C]Sensitivity[dBm]38.
4kbps,2V38.
4kbps,3V38.
4kbps,3.
6VFigure4.
6.
TypicalSensitivity2vs.
TemperatureandPowerSupplyVoltage,LGM,38.
4kbpsSWRA356Page7of22ApplicationNoteAN094-20.
0-10.
00.
010.
020.
030.
040.
050.
060.
070.
080.
090.
0100.
0-55-45-35-25-15-551525354555FrequencyOffset[MHz]Blocking/Selectivity[dB]1.
2kbps,3dB|-10.
00.
010.
020.
030.
040.
050.
060.
070.
0-1.
5-1-0.
500.
511.
5FrequencyOffset[MHz]Selectivity[dB]1.
2kbps,3dB1.
2kbps,16dBFigure4.
7.
TypicalBlocking/Selectivity,1.
2kbpsSWRA356Page8of22ApplicationNoteAN094-10.
00.
010.
020.
030.
040.
050.
060.
070.
080.
090.
0100.
0-55-45-35-25-15-551525354555FrequencyOffset[MHz]Blocking/Selectivity[dB]4.
8kbps,3dB-10.
00.
010.
020.
030.
040.
050.
060.
0-1.
5-1-0.
500.
511.
5FrequencyOffset[MHz]Selectivity[dB]4.
8kbps,3dB4.
8kbps,16dBFigure4.
8.
TypicalBlocking/Selectivity,4.
8kbpsSWRA356Page9of22ApplicationNoteAN094-20.
0-10.
00.
010.
020.
030.
040.
050.
060.
070.
080.
090.
0100.
0-55-45-35-25-15-551525354555FrequencyOffset[MHz]Blocking/Selectivity[dB]38.
4kbps,3dB-20.
0-10.
00.
010.
020.
030.
040.
050.
060.
0-1.
5-1-0.
500.
511.
5FrequencyOffset[MHz]Selectivity[dB]38.
4kbps,3dB38.
4kbps,16dBFigure4.
9.
TypicalBlocking/Selectivity,38.
4kbps-70-68-66-64-62-60-58-56-54-52-50-48-46-44-42-40-38-36-34-32-3052105211521252135214521552165217521852195220LevelindBmFrequencyinMHzETSIEN300220EN300328EN300440RXVCOleakageFigure4.
10.
TypicalRXRadiatedSpuriousEmission,HGM(VCOleakageworstangle)SWRA356Page10of22ApplicationNoteAN0944.
3.
2ReceivedSignalStrengthIndicator(RSSI)TheCC1101-CC1190RSSIreadoutscanbeconvertedtoanabsolutelevelindBmbysubtractinganoffset.
ACC1101-CC1190designhasadifferentoffsetvaluecomparedtoastandaloneCC1101designduetotheCC1190externalLNAgainandtheSAWfilterinsertionloss.
Table4.
4givesthetypicaloffsetvalueforHGMandLGM.
RefertotheCC1101datasheet[1]formoredetailsonhowtoconverttheRSSIreadouttoanabsolutepowerlevelindBm.
HGMLGM8163Table4.
4.
TypicalRSSIOffsetValues-120-110-100-90-80-70-60-50-40-30-20-120-110-100-90-80-70-60-50-40-30-20-100InputPower[dBm]RSSIReading[dBm]RSSIHGM38.
4kbps,3V,+25CFigure4.
11.
TypicalRSSIvs.
InputPowerLevel,HGM,38.
4kbps-110-100-90-80-70-60-50-40-30-20-100-120-110-100-90-80-70-60-50-40-30-20-100InputPower[dBm]RSSIReading[dBm]RSSILGM38.
4kbps,3V,+25CFigure4.
12.
TypicalRSSIvs.
InputPowerLevel,LGM,38.
4kbpsSWRA356Page11of22ApplicationNoteAN0944.
3.
3ListenBeforeTalk(LBT)ThresholdIfLBTisimplementedintheprotocolthechannelisnotconsideredavailableforuseifthereceivedsignalisabovetheLBTthreshold.
Conversely,ifthereceivedsignalisbelowtheLBTthreshold,thechannelisconsideredavailableforuse.
NotethatiftheprotocolimplementsLBTwithoutAdaptiveFrequencyAgility(AFA),thedutycyclelimitapplies.
RefertoEN300220-1V2.
3.
1formoredetails[4].
ForagivenAGCCTRL2.
MAX_LNA_GAINandAGCCTRL2.
MAX_DVGA_GAINregistersettingtheabsolutethresholdcanbeadjusted±7dBinstepsof1dBusingAGCCTRL1.
CARRIER_SENSE_ABS_THR.
SeeCC1101datasheet[1]formoredetails.
Table4.
5showstheLBTthresholdforHGMandLGMmodewithCARRIER_SENSE_ABS_THR=7(+7dB)and9(-7dB)respectively.
Table4.
5showsthatCC1101-CC1190EM869MHzreferencedesigncomplywiththeEN300220-1V2.
3.
1LBTthresholdlimitforbothHGMandLGM.
IftheprotocolimplementsLBTitisbettertohavethethresholdclosertotheLBTthresholdlimit.
Itisrecommended,butnotrequiredtohavetheCC1190inLGMwhendoingLBT.
DataRate[kbps]RXBW[kHz]HGM[dBm]LGM[dBm]Limit6[dBm]1.
260-98(+7dB)-93(-7dB)-92.
3/-96.
34.
8105-96(+7dB)-90(-7dB)-89.
8/-93.
838.
4105-97(+7dB)-90(-7dB)-89.
8/-93.
8Table4.
5.
TypicalLBTThreshold(thenumberinbracketsrefertoCARRIER_SENSE_ABS_THRsettingused)6LimitsareforoutputpowerCC1101-CC1190EM869MHzreferencedesign[3]witha50load.
Radiatedmeasurementsaredonewiththekitantenna.
ParameterConditionTypicalUnitOutputpower,HGMPATABLE=0x54PATABLE=0x55PATABLE=0x57PATABLE=0x36PATABLE=0x28PATABLE=0x27201918171615dBmEfficiency,HGMPATABLE=0x54PATABLE=0x55PATABLE=0x57PATABLE=0x36PATABLE=0x28PATABLE=0x27222017141211%SpuriousemissionwithPATABLE=0x54,HGMConductedbelow1GHzConductedabove1GHzRadiatedbelow1GHzRadiatedabove1GHzSeeFigure4.
17forradiatedmeasurementsabove1GHzCC1101-CC1190EM869MHzreferencedesign[3]witha50load.
15.
017.
019.
021.
023.
0-40-30-20-1001020304050607080Temperature[C]OutputPower[dBm]0x54,2V0x54,3V0x54,3.
6VFigure4.
13.
TypicalOutputPowervs.
TemperatureandPowerSupplyVoltage.
PATABLE=0x5413.
015.
017.
019.
021.
0-40-30-20-1001020304050607080Temperature[C]OutputPower[dBm]0x57,2V0x57,3V0x57,3.
6VFigure4.
14.
TypicalOutputPowervs.
TemperatureandPowerSupplyVoltage.
PATABLE=0x57SWRA356Page14of22ApplicationNoteAN094105.
0110.
0115.
0120.
0125.
0130.
0135.
0140.
0145.
0150.
0155.
0160.
0165.
0-40-30-20-1001020304050607080Temperature[C]TransmitCurrent[mA]0x54,2V0x54,3V0x54,3.
6VFigure4.
15.
TypicalTXCurrentConsumptionvs.
TemperatureandPowerSupplyVoltage.
PATABLE=0x5495.
0100.
0105.
0110.
0115.
0120.
0125.
0130.
0135.
0140.
0145.
0-40-30-20-1001020304050607080Temperature[C]TransmitCurrent[mA]0x57,2V0x57,3V0x57,3.
6VFigure4.
16.
TypicalTXCurrentConsumptionvs.
TemperatureandPowerSupplyVoltage.
PATABLE=0x57SWRA356Page15of22ApplicationNoteAN094-60-55-50-45-40-35-30-25-20-15-10-5051015208601500200025003000350040004390LevelindBmFrequencyinMHz869,354839MHz16,163dBm1,738950000GHz-36,144dBmSpuriouslimitETSI2,608550000GHz-38,013dBm3,412150000GHz-40,821dBm4,330678750GHz-45,726dBmFigure4.
17.
TypicalRadiatedFundamentalandSpuriousEmissionMeasuredatAnglewithHighestSpuriousEmissions.
PATABLE=0x54SWRA356Page16of22ApplicationNoteAN0948.
6758.
688.
6858.
698.
6958.
78.
7058.
718.
715x108-60-50-40-30-20-1001020-36dBm-36dBm-30dBm8.
6758.
688.
6858.
698.
6958.
78.
7058.
718.
715x108-60-50-40-30-20-1001020-36dBm-36dBm-30dBmFigure4.
18.
TypicalModulationBandwidth,38.
4kbps,PATABLE=0x57.
MeasuredwithResolutionBandwidthAccordingtoETSIEN300220-1[4]SWRA356Page17of22ApplicationNoteAN0945MeasurementEquipmentThefollowingequipmentwasusedforthemeasurements.
MeasurementInstrumentTypeInstrumentModelRXSignalGeneratorRohde&SchwarzSMT-03Rohde&SchwarzSMIQ06BTXSignalAnalyzerRohde&SchwarzFSQ26PowerSupplyAgilentE3631ARX/TXMultimeterKeithley2000StabilityAutomaticTunerMauryMT986EU32RadiatedspuriousEmissionsEMCchamberTable5.
1.
MeasurementEquipment6ControllingtheCC1190Therearethreedigitalcontrolpins(PA_EN,LNA_EN,andHGM)thatsetstheCC1190modeofoperation.
PA_ENLNA_ENHGMModeofOperation00XPowerDown010RXLGM011RXHGM100TXLGM101TXHGMTable6.
1.
CC1190ControlLogicTherearedifferentwaysofcontrollingtheCC1190modeofoperationinaCC1101-CC1190design.
UsingCC1101GDO0andGDO27pinstosettwooftheCC1190controlsignals(e.
g.
PA_ENandLNA_EN).
Thethirdcontrolsignal(e.
g.
HGM)canbehardwiredtoGND/VDDorconnectedtoanexternalMCU.
UsinganexternalMCUtocontrolPA_EN,LNA_EN,andHGM.
UsinganexternalMCUtosettwo(orallthree)digitalcontrolsignalsistherecommendedsolutionforaCC1101-CC1190designsinceGDO0orGDO2istypicallyprogrammedtoprovideasignalrelatedtotheCC1101packethandlerenginetotheinterfacingMCUandGDO1isthesamepinastheSOpinontheSPIinterface.
TheGDOpinnotusedtoprovideinformationtotheinterfacingMCUcanbeusedtocontroltheCC1190.
Figure6.
1showsasimplifiedapplicationcircuitwhereanexternalMCUcontrolsHGMandLNA_EN.
PA_ENiscontrolledeitherbyexternalMCUoroneoftheCC1101GDOpins.
7GDO1isnotusedsincethisisthesamepinastheSOpinontheSPIinterface.
TheoutputprogrammedonthispinwillonlybevalidwhenCSnishigh.
SWRA356Page18of22ApplicationNoteAN094CC110x/CC111xConnectedtoVDD/GND/MCURF_PGDOxRF_NSAWCC1190PA_ENLNA_ENHGMBIASVDDTR_SWLNA_OUTPA_OUTPA_INLNA_INVDD_LNAVDD_PA1VDD_PA2VDDConnectedtoMCUFigure6.
1.
SimplifiedCC11xx-CC1190ApplicationCircuit7CC1101RegisterSettingsItispossibletoimprovetheCC1101phasenoiseaboveapproximately200kHzoffsetatthecostofincreasedspursatRF±crystalfrequency/2bychangingtheFIFOTHRandTEST1registersettings.
ThesesettingsarenotusedfortheCC1101standalonedesignduetotheincreasedspurlevel,butsinceaSAWfilterisusedintheCC1101-CC1190design,thespurswillbeattenuatedsufficientlytomeetEN300220spuriousemissionrequirements.
ImprovingtheCC1101phasenoisereducesthemodulationbandwidthforagivenoutputpowerandallowsoperationupto+18dBmoutputpower.
ForagivendatarateaCC1101designandaCC1101-CC1190designcanusethesameregistersettingsexceptforregistersFIFOTHRandTEST1.
TheregistervalueslistedinTable7.
1needtobeusedforoptimumperformance.
ThesameregistersettingscannotbeusedinbothTXandRX.
CC1101RegisterSettingTXSettingRXFIFOTHR0xC70x47TEST10x2D0x35Table7.
1.
RecommendedRegisterSettingsfortheCC1101-CC1190Design8SmartRFStudioandSmartRF04EB/TrxEBTheCC1101-CC1190EM869MHztogetherwithSmartRFStudio7software[6]andSmartRF04BorTrxEBcanbeusedtoevaluateperformanceandfunctionality.
8.
1SmartRFStudioTheCC1101-CC1190canbeconfiguredusingtheSmartRFStudio7software[6].
TheSmartRFStudiosoftwareishighlyrecommendedforobtainingoptimumregistersettings.
TherecommendedregistersettingsforRXandTXinTable4.
1areimplementedinSmartRFStudio7.
SmartRFStudio7usesanexternalMCU(theUSBcontrollerontheEvaluationBoards)tocontrolthethreedigitalcontrolpins(PA_EN,LNA_EN,andHGM).
AscreenshotoftheSmartRFStudiouserinterfaceforCC1101-CC1190isshowninFigure8.
1.
SWRA356Page19of22ApplicationNoteAN094Figure8.
1.
SmartRFStudio7[6]UserInterfaceInordertocontroltheCC1190theuserneedstoselectCC1190as"RangeExtender"andselecttheappropriate"EMRevisions"asshowninFigure8.
1.
8.
2SmartRF04EB/TRxEBIftheSmartRF04BisconnectedtoaUSBsocketonaPC,itwilldrawpowerfromtheUSBbuswhentheswitchisinthepositionshowninFigure8.
2.
Theonboardvoltageregulatorsupplies3.
3Vtotheboard,buthaslimitedcurrentsourcecapabilityandcannotsupplytheCC1101-CC1190EM.
AnexternalsupplyisthereforeneededandshallbeconnectedasshowninFigure8.
2,wheretheredwireisthepositivesupplyandtheblackwireisGND.
WiththetestsetupinFigure8.
2theSmartRF04Bisconnectedtoa3.
3VsupplythroughtheUSBandvoltageregulatorandCC1101-CC1190ispoweredbytheexternalsupply.
SincetheSmartRF04Bisconnectedtoaregulated3.
3VsupplythesignalsgoingfromCC1101-CC1190toSmartRF04B(andviceversa)needtobewithin3.
0Vto3.
6V.
TheexternalsupplyconnectedtoCC1101-CC1190whenusingthetestsetupinFigure8.
2isthereforelimitedto3.
0Vto3.
6V.
Figure8.
2.
SmartRF04EBConnectionIfCC1101-CC1190isusedwiththeTrxEBandtheUSBcontrollerthesupplyrangeis3.
0Vto3.
6V.
SWRA356Page20of22ApplicationNoteAN0949ReferenceDesignTheCC1101-CC1190EM869MHzreferencedesignincludesschematicandgerberfiles[3].
Itishighlyrecommendedtofollowthereferencedesignforoptimumperformance.
Thereferencedesignalsoincludesbillofmaterialswithmanufacturersandpartnumbers.
9.
1PowerDecouplingProperpowersupplydecouplingmustbeusedforoptimumperformance.
ThecapacitorsC27-C29ensuregoodRFgroundafterL21andthuspreventRFleakageintothepowersupplylinescausingoscillations.
ThepowersupplyfilteringconsistingofC2,C3andL2ensurewelldefinedimpedancelookingtowardsthepowersupply.
9.
2Input/OutputMatchingandFilteringThePAandtheLNAoftheCC1190aresingleendedinput/output.
AbalunisrequiredtotransformthedifferentialoutputoftheCC1101tosingleendedinputoftheCC1190PAandthesingleendedoutputoftheLNAtothedifferentialinputofCC1101.
ThevaluesofthematchingcomponentsbetweentheSAWfilterandtheCC1190PAinputarechosentopresentoptimumsourceimpedancetotheCC1190PAinputwithrespecttostability.
TheCC1190PAperformanceishighlydependentontheimpedancepresentedattheoutput,andtheLNAperformanceishighlydependentontheimpedancepresentedattheinput.
TheimpedanceisdefinedbyL21andallcomponentstowardstheantenna.
Thesecomponentsalsoensuretherequiredfilteringofharmonicstopassregulatoryrequirements.
C30worksasaDC-block.
Thelayoutandcomponentvaluesneedtobecopiedexactlytoobtainthesameperformanceaspresentedinthisapplicationnote.
9.
3BiasResistorR141isabiasresistor.
ThebiasresistorisusedtosetanaccuratebiascurrentforinternaluseintheCC1190.
9.
4CrystalTherearespursappearingatNtimesthereferencefrequency(=Nxcrystalfrequency/2).
Thesespursarealsofoldedaroundthecarrier.
ThefurtherawayinHzthespursarefromthecarrierthelowertheywillbeinamplitude.
Foroperationat869.
525MHzthespurclosesttothecarrierwillbeat864MHzwhenusinga27MHzcrystalandat871MHzwhenusinga26MHzcrystal.
A27MHzcrystalfrequencyisrecommendedfortheCC1101-CC1190design.
9.
5SAWFilterASAWisrecommendedfortheCC1101-CC1190designtoattenuatespursbelowthecarrierfrequencythatwillotherwiseviolatespuriousemissionlimitsunderEN300220.
TheSAWfilterismatchedtotheCC1190PAinput/LNAoutputimpedanceusingaseriesinductorandashuntcapacitor.
9.
6PCBLayoutConsiderationsTheTexasInstrumentsreferencedesignusesa1.
6mm(0.
062")4-layerPCBsolution.
Notethatthedifferentlayershavedifferentthickness.
ItisrecommendedtofollowtherecommendationgivenintheCC1101–CC1190EM869MHzreferencedesign[3]toensureoptimumperformance.
Thetoplayerisusedforcomponentsandsignalrouting,andtheopenareasarefilledwithmetallizationconnectedtogroundusingseveralvias.
Theareasunderthetwochipsareusedforgroundingandmustbewellconnectedtothegroundplanewithmultiplevias.
FootprintrecommendationfortheCC1190isgivenintheCC1190datasheet[2].
SWRA356Page21of22ApplicationNoteAN094Layertwoisacompletegroundplaneandisnotusedforanyrouting.
Thisisdonetoensureshortreturncurrentpaths.
Thelowimpedanceofthegroundplanepreventsanyunwantedsignalcouplingbetweenanyofthenodesthataredecoupledtoit.
Layerthreeisapowerplane.
Thepowerplaneensureslowimpedancetracesatradiofrequenciesandpreventsunwantedradiationfrompowertraces.
Layerfourisusedforrouting,andasforlayerone,openareasarefilledwithmetallizationconnectedtogroundusingseveralvias.
10DisclaimerTheCC1101-CC1190EMevaluationboardisintendedforuseforENGINEERINGDEVELOPMENT,DEMONSTRATION,OREVALUATIONPURPOSESONLYandisnotconsideredbyTItobeafinishedend-productfitforgeneralconsumeruse.
Personshandlingtheproduct(s)musthaveelectronicstrainingandobservegoodengineeringpracticestandards.
Assuch,thegoodsbeingprovidedarenotintendedtobecompleteintermsofrequireddesign-,marketing-,and/ormanufacturing-relatedprotectiveconsiderations,includingproductsafetyandenvironmentalmeasurestypicallyfoundinendproductsthatincorporatesuchsemiconductorcomponentsorcircuitboards.
ThisevaluationboardhasbeentestedagainstEN300220regulations,buttherehasbeennoformalcompliancetestingatanexternaltesthouse.
Itistheenduser'sresponsibilitytoensurethathissystemcomplieswithapplicableregulations.
11References[1]CC1101Datasheet(SWRS061.
pdf)[2]CC1190Datasheet(SWRS089.
pdf)[3]CC1101–CC1190EM869MHzReferenceDesign(SWRR075.
zip)[4]ETSIEN300220V2.
3.
1:ElectromagneticcompatibilityandRadiospectrumMatters(ERM);ShortRangeDevices(SRD);Radioequipmenttobeusedinthe25MHzto1000MHzfrequencyrangewithpowerlevelsrangingupto500mW"[5]CEPT/ERC/Recommendation70-03:"RelatingtotheuseofShortRangeDevices(SRD)"[6]SmartRFStudio7(SWRC176.
zip)12GeneralInformation12.
1DocumentHistoryRevisionDateDescription/ChangesSWRA3562011.
01.
10Initialrelease.
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