TIDAC8775四路模拟输出模块参考设计TIPD

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1、TIDAC8775四路模拟输出模块参考设计TIPD215时间：2017-04-0610:57:34作者：TI来源：中电网TI公司的DAC8775是具有自适应功率管理的四路全集成16位数模转换器(DAC),可编程电流和电压输出，自适应功率管理可使芯片的功耗最小化，工作电压+12V至iJ+36V,工作温度-40°C到+125°C,主要用在4mA・20mA电流回路，模拟输出模块,PLC,建筑物自动化，传感器发送器和过程控制.本文介绍了DAC8775主要特性，框图，以及具有自适应功耗管理的总功耗小于1W的四路模拟输出模块TIPD215参考设计主

2、要特性，框图，电路图，材料清单和PCB设计图.TheDAC8775isaquad-channelprecision,fullyintegrated,16-bit,digital-to-analogconverter(DAC)withadaptivepowermanagement,andisdesignedtomeettherequirementsofindustrialcontrolapplications・Theadaptivepowermanagementcircuit,whenenabled,minimizesthepowerdi

3、ssipationofthechip.Whenprogrammedasacurrentoutput,thesupplyvoltageonthecurrentoutputdriverisregulatedbetween4.5Vand32Vbasedoncontinuousfeedbackofvoltageonthecurrentoutputpinviaanintegratedbuck/boostconverter.Whenprogrammedasavoltageoutput,thiscircuitgeneratesaprogrammabl

4、esupplyvoltageforthevoltageoutputstage(±15V).DAC8775alsocontainsanLDOtogeneratethedigitalsupply(5V)fromasinglepowersupplypin.DAC8775isalsoimplementedwithaHighwayAddressableRemoteTransducer(HART)SignallnterfacetosuperimposeanexternalHARTsignalonthecurrentoutput.Theslewrat

5、eofthecurrentoutputDACisregisterprogrammable・Thedevicecanoperatewithasingleexternalpowersupplyof+12Vto+36Vusingtheintegratedbuck/boostconvertersorwithexternalpowersupplieswhenthebuck/boostconvertersaredisabled・DAC8775主要特性：•OutputCurrent:一0mAto24mA;3.5mAto23.5mA;0mAto20mA

6、;4mAto20mA;±24mA•OutputVoltage(with/without20%over-range):-0Vto5V;0Vto10V;±5V;±10V-0Vto6V;0Vto12V;±6V;±12V•AdaptivePowerManagement•SingleWidePowerSupplyPin(12V-36V)•±0.1%FSRTotalUnadjustedError(TUE)•DNL:±1LSBMax•Internal5-VReference(10ppm/°Cmax)•Internal5-VDigitalPowerSu

7、pplyOutput•CRC/FrameErrorCheck,WatchdogTimer•ThermalAlarm,Open/ShortCircuitforSystemReliability•SafeActionsonAlarmCondition•AutoLearnLoadDetection•WideTemperatureRange:-40°Cto+125°CDAC8775应用：•4-mAto20-mACurrentLoops•AnalogOutputModules•ProgrammableLogicControllers(PLCs)•

8、BuildingAutomation•SensorTransmitters•ProcessControlBlockDiagram心OjIii—I=ISOKSOK«$€Tcut$TNCSOOCCOMPjVOO