Programmable-Gain Amplifier, Using the MAX532 DAC

Abstract:ThisapplicationnotediscusseshowtousetheMAX532tobuildaprogrammablegainamplifier(PGA)that'ssuitableforACgaincontrol.Noexternalcomponentsarenecessary.Equationsareprovidedtoeasilycalculatetheoutputvalues.Maxim>AppNotes>A/DandD/ACONVERSION/SAMPLINGCIRCUITSDIGITALPOTENTIOMETERSKeywords:programmablegainamplifier,PGA,MAX532,programmablegain,programmableresistor,acgainNov01,2000controlAPPLICATIONNOTE429Programmable-GainAmplifier,UsingtheMAX532DACAbstract:ThisapplicationnotediscusseshowtousetheMAX532tobuildaprogrammablegainamplifier(PGA)that'ssuitableforACgaincontrol.Noexternalcomponentsarenecessary.Equationsareprovidedtoeasilycalculatetheoutputvalues.TheMAX532isadual,12-bit,voltage-outputDAC.Accesstotheoutputamplifier'sinputterminalsallowsittobeeasilyconfiguredasaprogrammable-gainamplifier(PGA)suitableforACgaincontrol.Thecircuitconfigurationisthatofaninvertingamplifier