EPOT Applications: Gain Adjustment in Op-Amp Circuits

Variablegainamplifiersoftenuseamechanicalpotentiometertosetthegain.Anexampleisavolumecontroldial.However,whentheanalogsignalpathisdigitallycontrolled,adigitalpotentiometermightbeusedtocontrolgain.Thisarticlediscussestheuseofthedigitalpotentiometertoformdigitallycontrolledgainorfilterblocks.Maxim>AppNotes>AMPLIFIERANDCOMPARATORCIRCUITSDIGITALPOTENTIOMETERSKeywords:EPOTApplications:GainAdjustmentinOp-AmpCircuitsNov28,2001APPLICATIONNOTE864EPOTApplications:GainAdjustmentinOp-AmpCircuitsVariablegainamplifiersoftenuseamechanicalpotentiometertosetthegain.Anexampleisavolumecontroldial.However,whentheanalogsignalpathisdigitallycontrolled,adigitalpotentiometermightbeusedtocontrolgain.Thisarticlediscussestheuseofthedigitalpotentiometertoformdigitallycontrolledgainorfilterblocks.GeneralThroughoutthisdiscussionofdigitalpotentiometers,thetermEPOTisusedratherthandigitalpot,EEPOTorEPOT.ThetermEPOTdescribestheMaximseriesofvola