Comparatorsareusedformanythings,butmanypeo-
plewanttobuildanalog-to-digitalconvertersusinga
comparator.Comparatorsareonebasicbuildingblock
ofallADCarchitectures.APICmicro
®
microcontroller
withinternalcomparatorscanbecomeanADCwiththe
applicationofsomesoftwareandaminimumofexter-
nalhardware.Inthisapplicationnoteyouwillbeshown
howtobuildaSlopeADC.ThisADChasbeenused
withthedigitalpinsonPICmicromicrocontrollersfor
manyyears.Theadditionofacomparatortothecircuit
improvestheresultsandreducesthepowerconsump-
tion.AN863AComparatorBasedSlopeADCThermistorsAuthor:JosephJulicherThermistorsaredevicesthatchangeinresistancewithMicrochipTechnologyInc.changesintemperature.Thermistorsaremoreprop-erlycalledRTDs(ResistiveTemperatureDetectors).INTRODUCTIONAnRTDcanbemadefromavarietyofsubstancesdependingonthedesiredoper
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