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1、TIDAC8760PLC16位模拟输出模块参考设计方案关键字：工业控制,可编逻辑控制器(PLC),DACTI公司的DAC7760和DAC8760是低成本全集成12位和16位数模转换器(DAC),设计用于满足工业过程控制的要求,输出电流在4mA-20mA,0mA-20mA或0mA-24mA或输出电压在0V-5V,0V-10V,±5V,或±10V,工作温度从–40℃到+125℃,主要用在4mA-20mA电流回路,模拟输出模,建筑物自动化相关设备,环境监测和可编逻辑控制器(PLC).本文介绍了DAC7760
2、和DAC8760主要特性,框图,DACx760输出模块(AO)框图和DACx760评估模块主要特性,框图,电路图,材料清单与PCB元件布局图,以及PLC16位模拟输出(AO)模块参考设计主要特性,电路图和材料清单. 16-BitAnalogOutputModuleReferenceDesignforProgrammableLogicControllers(PLC)TheDAC7760andDAC8760arelow-cost,precision,fully-integrated,12-bitand16
3、-bitdigital-to-analogconverters(DACs)designedtomeettherequirementsofindustrialprocess-controlapplications.Thesedevicescanbeprogrammedasacurrentoutputwitharangeof4mAto20mA,0mAto20mA,or0mAto24mA;orasavoltageoutputwitharangeof0Vto5V,0Vto10V,±5V,or±10V,with
4、a10%overrange(0Vto5.5V,0Vto11V,±5.5V,or±11V).Bothcurrentandvoltageoutputscanbesimultaneouslyenabledwhilebeingcontrolledbyasingledataregister.Thesedevicesincludeapower-on-resetfunctiontoensurepoweringupinaknownstate(bothIOUTandVOUTaredisabledandinaHi-Zst
5、ate).TheCLRandCLR-SELpinssetthevoltageoutputstozero-scaleormidscale,andthecurrentoutputtothelowendoftherange,iftheoutputisenabled.Zeroandgainregisterscanbeprogrammedtodigitallycalibratethedeviceintheendsystem.Theoutputslewrateisalsoprogrammablebyregiste
6、r.ThesedevicescansuperimposeanexternalHARTsignalonthecurrentoutputandcanoperatewitheitherasingle+10-Vto+36-Vsupply,ordualsuppliesofupto±18V.Allversionsareavailableinboth6-mm×6-mmQFN-40andTSSOP-24packages.DAC8760主要特性:CurrentOutput:4mAto20mA;0mAto20mA;0mA
7、to24mAVoltageOutput:0Vto5V;0Vto10V;±5V;±10V0Vto5.5V;0Vto11V;±5.5V;±11V(10%Overrange)±0.1%FSRTotalUnadjustedError(TUE)MaxDNL:±1LSBMax SimultaneousVoltageandCurrentOutputInternal5-VReference(10ppm/°C,max)Internal4.6-VPower-SupplyOutputReliabilityFeatures:
8、CRCCheckandWatchdogTimerThermalAlarmOpenAlarm,ShortCurrentLimitWideTemperatureRange:–40℃to+125℃6-mm×6-mmQFN-40;TSSOP-24PackagesDAC8760应用: •4-mAto20-mACurrentLoops •AnalogOutputModules•BuildingAutomationRELATEDDEVICES•EnvironmentM
