混合信号通信的数字编码方案

AnAnalog-to-Digital(A/D)convertertranslatesanana-

loginputsignalintoadiscretedigitalcode.Thisdigital

representationofthe“realworld”signalcanbemanip-

ulatedinthedigitaldomainforthepurposesofinforma-

tionprocessing,computing,datatransmissionor

controlsystemimplementation.Inanyapplication

whereaconverterisused,itisadvantageoustohave

thecodestructurecomplementthemicrocontroller’s

operands.

Thisapplicationnotedescribesthestraightbinaryand

binarytwo’scomplementcodeschemesthatareout-

puttedbyMicrochip’sAnalog-to-Digital(A/D)convert-

ers.

Allcodeexamplesgiveninthisapplicationnotearefor

a4-bitconversion.Themediananalogvoltagesinthe

tablesaretheequivalentanalogvoltagesthatareatthe

centerofthedigitalcode.MAN753DigitalCodingSchemesforMixedSignalCommunicationAuthor:BonnieC.BakerMedianAnalogVoltageDigitalCodeMicrochipTechnologyInc.(V)0.9375FS(15/16FS)1111OVERVIEW0.875FS(14/16FS)1110AnAnalog-to-Digital(A/D)convertertranslatesanana-0.8125FS(13/16FS