User's Manual
Table Of Contents
RF Integration
Rev 1.1 Mar.06 15
etc.).Ifthecablesarenearthenoisesources,thenoisemay
becoupledintotheRFcableandintotheantenna.
Disabling the diversity antenna (MC5720/5725)
IfyourhostdeviceisnotdesignedtousetheMC5720/5725’s
diversityantenna,terminatetheinterfacewithano‐connect.
Interference and sensitivity
Note: These modules are based
on ZIF (Zero Intermediate
Frequency) technologies; when
performing EMC
(Electromagnetic Compatibility)
tests, there are no IF
(Intermediate Frequency)
components from the module to
consider.
SeveralsourcesofinterferencecanaffecttheRFperformance
ofthemodule(RF desense).Commonsourcesincludepower
supplynoiseanddevice‐generatedRF.
RF desensecanbeaddressedthroughacombinationof
mitigationtechniquesandradiatedsensitivitymeasurement.
Power supply noise
NoiseinthepowersupplycanleadtonoiseintheRFsignal.
Thepowersupplyripplelimitforthemoduleisnomorethan
200 mVp‐p1Hzto100 kHz.Thislimitincludesvoltageripple
duetotransmitterburstactivity
Interference from other wireless devices
Differentwirelessdevicesoperatinginsidethehostdevicecan
causeinterferencethataffectsthemodule.
Todeterminethemostsuitablelocationsforeachantennaon
yourhostdevice,evaluateeachwirelessdevice’sradiosystem,
consideringthefollowing:
• Anyharmonics,sub‐harmonics,orcross‐productsofsignals
generatedbywirelessdevicesthatfallinthemodule’sRx
rangemaycausespuriousresponseresultingindecreased
Rxperformance.
• TheTxpowerandcorrespondingbroadbandnoiseofother
wirelessdevicesmayoverloadorincreasethenoisefloorof
themodule’sreceiver,resultinginRxdesense.
Theseverityofthisinterferencedependsontheclosenessof
theotherantennastothemodule’santenna.Todetermine
suitablelocationsforeachwirelessdevice’santenna,
thoroughlyevaluateyourhostdevice’sdesign.