大连交通大学2007届本科生毕业设计（论文）外文翻译PAGE\*MERGEFORMAT16FEATURESComputesTruermsvalueAveragerectifiedvalueAbsolutevalueProvides200mVfull-scaleinputrange(largerinputswithinputattenuator)Highinputimpedance:1012ΩLowinputbiascurrent:25pAmaximumHighaccuracy:±0.3mV±0.3%ofreadingRMSconversionwithsignalcrestfactorsupto5Widepowersupplyrange:+2.8V,−3.2Vto±16.5VLowpower:200mAmaximumsupplycurrentBufferedvoltageoutputNoexternaltrimsneededforspecifiedaccuracyAD737—anunbufferedvoltageoutputversionwithchippower-downalsoavailableGENERALDESCRIPTIONTheAD736isalowpower,precision,monolithictruerms-to-dcconverter.Itislasertrimmedtoprovideamaximumerrorof±0.3mV±0.3%ofreadingwithsinewaveinputs.Furthermore,itmaintainshighaccuracywhilemeasuringawiderangeofinputwaveforms,includingvariableduty-cyclepulsesandtriac(phase)-controlledsinewaves.Thelowcostandsmallsizeofthisconvertermakeitsuitableforupgradingtheperformanceofnon-rmsprecisionrectifiersinmanyapplications.Comparedtothesecircuits,theAD736offershigheraccuracyatanequalorlowercost.TheAD736cancomputethermsvalueofbothacanddcinputvoltages.Itcanalsobeoperatedasanac-coupleddevicebyaddingoneexternalcapacitor.Inthismode,theAD736canresolveinputsignallevelsof100μVrmsorless,despitevariationsintemperatureorsupplyvoltage.Highaccuracyisalsomaintainedforinputwaveformswithcrestfactorsof1to3.Inaddition,crestfactorsashighas5canbemeasured(introducingonly2.5%additionalerror)atthe200mVfull-scaleinputlevel.TheAD736hasitsownoutputbufferamplifier,therebypro-vidingagreatdealofdesignflexibility.Requiringonly200μAofpowersupplycurrent,theAD736isoptimizedforuseinportablemultimetersandotherbattery-poweredapplications.TheAD736allowsthechoiceoftwosignalinputterminals:ahighimpedanceFETinput(1012Ω)thatdirectlyinterfaceswithHigh-Zinputattenuatorsandalowimpedanceinput(8kΩ)thatallowsthemeasurementof300mVinputlevelswhileoperatingfromtheminimumpowersupplyvoltageof+2.8V,−3.2V.Thetwoinputscanbeusedeithersingleendedordifferentially.TheAD736hasa1%readingerrorbandwidtht