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ADIAD5700HART调制解调器评估方案关键字：工业控制,HART复接器,HART网络连接,PLC,DCSADI公司的AD5700/AD5700-1是HARTFSK半双工调制解调器单片解决方案，和HART物理层的需求兼容，集成了所有需要的滤波，信号调理，调制和解调，信号产生功能，外接元件很少，2V-5.5V电源，接口电平1.71V-5.5V，主要用在场发送器，HART复接器，HART网络连接，PLC和DCS模拟I/O模块。本文介绍了AD5700主要特性，方框图，连接图，回路供电的发送器框图，HART智能发送器参考电路图以及AD5700/AD5700-1HART调制解调器评估板主要特性，电路图，材料清单和PCB元件布局图。ADITheAD5700/AD5700-1aresingle-chipsolutions,designedandspecifiedtooperateasaHART®FSKhalf-duplexmodem,complyingwiththeHARTphysicallayerrequirements.TheAD5700/AD5700-1integrateallofthenecessaryfiltering,signaldetection,modulating,demodulatingandsignalgenerationfunctions,thusrequiringfewexternalcomponents.The0.5%precisioninternaloscillatorontheAD5700-1greatlyreducestheboardspacerequirements,makingitidealforline-poweredapplicationsinbothmasterandslaveconfigurations.Themaxi-mumsupplycurrentconsumptionis115μA,makingtheAD5700/AD5700-1anoptimalchoiceforlowpowerloop-poweredapplications.Transmitwaveformsarephasecontinuous1200Hzand2200Hzsinusoids.TheAD5700/AD5700-1containaccuratecarrierdetectcircuitryanduseastandardUARTinterface.AD5700主要特性：HART-compliantfullyintegratedFSKmodem1200Hzand2200Hzsinusoidalshiftfrequencies115μAmaximumsupplycurrentinreceivemodeSuitableforintrinsicallysafeapplicationsIntegratedreceiveband-passfilterMinimalexternalcomponentsrequiredClockingoptimizedforvarioussystemconfigurationsUltralowpowercrystaloscillator(60μAmaximum)ExternalCMOSclocksourcePrecisioninternaloscillator(AD5700-1only)BufferedHARToutput—extradrivecapability8kVHBMESDrating2Vto5.5Vpowersupply1.71Vto5.5Vinterface−40℃to+125℃operation4mm×4mmLFCSPpackageHARTphysicallayercompliantUARTinterfaceAD5700应用：FieldtransmittersHARTmultiplexersPLCandDCSanalogI/OmodulesHARTnetworkconnectivity图1。AD5700方框图图2。AD5700/01外接和内部滤波器选择的连接图图3。AD5700回路供电的发送器框图图4。AD5700HART智能发送器参考电路图AD5700/AD5700-1HART调制解调器评估板ThisuserguidedescribestheevaluationboardfortheAD5700/AD5700-1HighwayAddressableRemoteTransducer(HART®)modem.ThisboardcanbeusedtoevaluateeithertheAD5700ortheAD5700-1part.Bothcanoperatefromasingle2Vto5.5Vsupply,withtheAD5700-1havingtheaddedfeatureofanintegratedoscillator.CompletespecificationsforbothproductscanbefoundintheAD5700/AD5700-1datasheetavailablefromAnalogDevices,Inc.,whichshouldbeconsultedinconjunctionwiththisuserguidewhenusingtheevaluationboard.HART调制解调器评估板主要特性：ConvenientconnectionsforpowerthroughscrewTerminalblockUseofon-chipRCoscillatororanexternalcrystalVariouslinkoptionsEQUIPMENTNEEDEDHostcontrollerwithUARTinterface图5。HART调制解调器评估板外形图AO-Electronics傲壹电子官网：中文网：。HART调制解调器评估板电路图HART调制解调器评估板材料清单（BOM）：图7。HART调制解调器评估板元件布局图