标签: 差分adc

Truedifferentialconverterscanoffermanyadvantagesoversingle-endedinputA/DConverters(ADC).Inaddi-tiontotheircommonmoderejectionability,thesecon-verterscanalsobeusedtoovercomemanyDCbiasinglimitationsofcommonsignalconditioningcircuits.Listedbelowaresometypicalapplicationissuesthatcanbesolvedwithproperbiasingofadifferentialcon-verter:•Limitedoutputswingofamplifiers•UnwantedDC-biaspoint•Lowlevelnoiseridingonground•UnwantedorchangingcommonmodelevelofinputsignalThisapplicationnotediscussesdifferentialinputconfig-urationsandtheiroperation,circuitstoimplementtheseinputmodesandtechniquesinchoosingthecor-rectvoltagelevelstoovercomethepreviouslymentionedchallenges.MAN842DifferentialADCBiasingTechniques,TipsandTricksItisimportanttonotethattheconverteroutputiszeroAuthor:CraigL.Kingwhentheinputsareequal.AsthevoltagedifferenceMicrochipTechnologyInc.betweenIN+andIN-increases,theoutputcodealsoincreases.ThemaximumvoltageatwhichdigitalcodeINTRODUCTIONsaturationwilloccurisVREF.Thedifferentialconver-……