标签: A5191HRT

HARTModemDescriptionTheA5191HRTisasingle−chip,CMOSmodemforuseinhighwayaddressableremotetransducer(HART)fieldinstrumentsandmasters.ThemodemandafewexternalpassivecomponentsprovideallofthefunctionsneededtosatisfyHARTphysicallayerrequirementsincludingmodulation,demodulation,receivefiltering,carrierdetect,andtransmit−signalshaping.TheA5191HRTusesphasecontinuousfrequencyshiftkeying(FSK)at1200bitspersecond.Toconservepowerthereceivecircuitsaredisabledduringtransmitoperationsandviceversa.Thisprovidesthehalf−duplexoperationusedinHARTcommunications.