SkyTraq PX1172R - Design, Handling, and Usage Guidelines; PCB Layout and RF Path Guidelines; Handling, ESD, and RTK Usage Tips

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LAYOUTGUIDELINES 
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SeparateRFanddigitalcircuitsintodifferentPCBregions. 
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Itisnecessarytomaintain50‐ohmimpedancethroughouttheentireRFsignalpath.TrykeepingtheRFsignalpathas
shortaspossible. 
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DonotroutetheRFsignallinenearnoisysourcessuchasdigitalsignals,oscillators,switchingpowersupplies,orother
RFtransmittingcircuit.DonotroutetheRFsignalunderoroveranyothercomponents(includingPX1172R),orother
signaltraces.DonotroutetheRFsignalpathonaninnerlayerofamulti‐layerPCBtominimizesignalloss.
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AvoidsharpbendsforRFsignalpath.Maketwo45‐degbendsoracircularbendinsteadofasingle90‐degreebendif
needed.
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Avoid vias with RF signal path whenever possible. Every via addsinductiveimpedance.Viasareacceptablefor
connectingtheRFgroundsbetweendifferentlayers.Eachofthemodule’sgroundpinsshouldhaveshorttracetying
immediatelytothegroundplanebelowthroughavia.
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ThebypasscapacitorsshouldbelowESRceramictypesandlocateddirectlyadjacenttothepintheyarefor.
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HANDLINGGUIDELINE
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ThePX1172RmodulesareratedMSL4,mustbeusedforSMTreflowmountingwithin72hoursaftertakenoutfrom
the vacuumedESD‐protectivemoisturebarrier bagin factorycondition <30degC / 60%RH. Ifthis floorlifetime is
exceeded,orifthereceivedESD‐protectivemoisturebarrierbagisnotinvacuumedstate,thenthedeviceneedtobe
pre‐bakedbeforeSMTreflowprocess.Bakingistobedoneat85degCfor8to12hours.Oncebaked,floorlifecounting
beginsfrom0,andhas72hoursoffloorlifeatfactorycondition<30degC/60%RH.
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PX1172RmoduleisESDsensitivedeviceandshouldbehandledwithcare.
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RTKUsageGuideline
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BelowconditionsarerequiredforgettingRTKfixsolution.Iftheconditionsarenotmet,PX1172Rwillonlyhavefloator
DGPS/3DsolutionandbehavelikeanormalGNSSreceiver.
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*Baseandroverdistanceunder30Km
*Openskyenvironmentwithoutinterference
*Signalover37dB/Hz 
*8ormoresatellitesabove15degreeelevationanglewithgoodsatellitegeometryorlowDOPvalue;generallymore
satelliteswillhavefasterRTKfix