机械电位器和数字电位器比较

Resistorpotentiometerscanbefoundinelectroniccir-

cuitsacrossawidespectrumofapplications.Mosttyp-

ically,theyfunctioninavoltagedividerconfigurationin

ordertoexecutevarioustypesoftasks,suchasoffset

orgainadjust.Thetwotypesofpotentiometerscom-

paredinthisapplicationnotearethemechanicalpoten-

tiometer(alsocalledatrimmerpotentiometer)andthe

digitalpotentiometer.Thephysicaldescriptionsandcir-

cuitmodelsofthesetwodevicesareshowninFigure1.AN219ComparingDigitalPotentiometerstoMechanicalPotentiometersAuthor:BonnieC.Baker,Earliermechanicalpotentiometerswerebuiltbywrap-MicrochipTechnologyInc.pingaresistivewirearoundacylinder.Withthiscon-struction,thewipermovesfromonewindingtothenext.Asthewiperismovedacrosstheelement,thereINTRODUCTIONarediscretestepsinresistance.FollowingthisstyleofResistorpotentiom