INTRODUCTION
Photodiodesbridgethegapbetweenlightand
electronics.Manytimes,precisionapplications(such
asCTscanners,bloodanalyzers,smokedetectors,
positionsensors,IRpyrometersandchromatographs)
utilizethebasictransimpedanceamplifiercircuitthat
transformslightenergyintoausableelectricalvoltage.
Inthesecircuits,photodiodesareusedtocapturethe
lightenergyandtransformitintoasmallcurrent.This
currentisproportionaltothelevelofilluminationfrom
thelightsource.Apreamplifierthenconvertsthe
current(inamperes)fromthephotodiodesensorintoa
usablevoltagelevel.MAN692UsingaDigitalPotentiometertoOptimizeaPrecisionSingle-SupplyPhotoDetectionCircuitPhotodiodeCharacteristicsAuthor:BonnieC.BakerMicrochipTechnologyInc.AphotodiodecanbeoperatedinthePhotovoltaicorPhotoconductivemode,asshowninFigure2.INTRODUCTIONLightSourcePhotodiodesbridgethegapbetweenlightandLighte
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