PICmicro微控制器的标准的模拟电话线连接

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Thisapplicationnotedescribeshowtoconnecta

PICmicromicrocontrollerdevicetoastandardanalog

telephonelineinordertosendandreceivesingleand

multiplefrequencysignalsthroughmodulationand

demodulation(i.e.,MODEM).Althoughtherearemany

differentelementswithinamodemsystem,weareonly

concernedherewiththelineconnection.AN854ConnectingaPICmicroMicrocontrollertoaStandardAnalogTelephoneLineFigure1showshowtheringandtiplinesrunintotheAuthor:DavidHedleyprimaryofatransformer.ThehookswitchonthelineMicrochipTechnologyInc.sideofthetransformerisnotshownbutcanbeimple-mentedwithopto-couplers,relaysorswitches.Whena

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