Analysis of ADC System Distortion Caused by Source Resistance

Abstract:Analog-to-digitalconverter(ADC)datasheetsandapplicationtypicallyrecommenddrivingtheirinputswithalowsourceimpedance.ThisapplicationnoteexplainsthepossibleeffectssuchasincreasedgainerroranddistortionwhenusinghighimpedancetodriveanADCwithoutabuffer.Maxim>AppNotes>A/DandD/ACONVERSION/SAMPLINGCIRCUITSKeywords:ADC,analogtodigitalconverter,voltagedivider,distortion,gainerror,highimpedance,lowMar25,2003impedance,samplingcapacitor,timeconstant,a/dconvertersAPPLICATIONNOTE1948AnalysisofADCSystemDistortionCausedbySourceResistanceAbstract:Analog-to-digitalconverter(ADC)datasheetsandapplicationtypicallyrecommenddrivingtheirinputswithalowsourceimpedance.ThisapplicationnoteexplainsthepossibleeffectssuchasincreasedgainerroranddistortionwhenusinghighimpedancetodriveanADCwithoutabuffer.Analog-to-digitalconverter(ADC)usershavebeeninstructedbyendlessdatasheetsandapplicationnotestodrivetheirADCswithalowsourceimpedance.However,thesei