TIDAC856x双路16位低功耗电压输出DAC解决方案

TIDAC856x双路16位低功耗电压输出DAC解决方案关键字：工业控制,数据采集系统,手提仪表TI公司的DAC856x,DAC816x和DAC756x系列分别是低功耗电压输出双路16位,14位和12位数模转换器(DAC),集成了2.5-V,4-ppm/°C基准电压,满刻度输出电压范围2.5V或5V,主要用于手提仪表,双极输出,PLC模拟输出模块,闭环伺服控制,压控振荡器,数据采集系统和可编增益和失调调整.本文介绍了DAC856x主要特性,方框图,应用电路以及DAC7562EVM评估板主要特性,电路图和材料清单.TheDAC856x,DAC816x,andDAC756xarelow-power,voltage-output,dual-channel,16-,14-,and12-bitdigital-to-analogconverters(DACs),respectively.Thesedevicesincludea2.5-V,4-ppm/℃internalreference,givingafull-scaleoutputvoltagerangeof2.5Vor5V.Theinternalreferencehasaninitialaccuracyof±5mVandcansourceorsinkupto20mAattheVREFIN/VREFOUTpin.Thesedevicesaremonotonic,providingexcellentlinearityandminimizingundesiredcode-to-codetransientvoltages(glitch).Theyuseaversatilethree-wireserialinterfacethatoperatesatclockratesupto50MHz.TheinterfaceiscompatiblewithstandardSPI,QSPI,Microwire,anddigitalsignalprocessor(DSP)interfaces.DAC856x主要特性:RelativeAccuracy:DAC856x(16-Bit):4LSBINLDAC816x(14-Bit):1LSBINLDAC756x(12-Bit):0.3LSBINLGlitchEnergy:0.1nV-sBidirectionalReference:Inputor2.5-VOutputOutputDisabledbyDefault±5-mVInitialAccuracy(Max)4-ppm/℃TemperatureDrift(Typ)10-ppm/℃TemperatureDrift(Max)20-mASink/SourceCapabilityPower-OnResettoZeroScaleorMid-ScaleLow-Power:4mW(Typ,5-VAVDD,IncludingInternalReferenceCurrent)WidePower-SupplyRange:2.7Vto5.5V50-MHzSPIWithSchmitt-TriggeredInputsLDACandCLRFunctionsOutputBufferWithRail-to-RailOperationPackages:QFN-10(3x3mm),MSOP-10TemperatureRange:–40℃to125℃DAC856x应用:•PortableInstrumentation•BipolarOutputs(referencedesign)•PLCAnalogOutputModule(referencedesign)•Closed-LoopServoControl•VoltageControlledOscillator•DataAcquisitionSystems•ProgrammableGainandOffsetAdjustment图1.DAC856x方框图图2.DAC85620-20mA/±10-V输出电路图DAC7562EVM评估板Thisuser’sguidedescribesthecharacteristics,operation,anduseoftheDAC8562EVM.Theevaluationmodel(EVM)isanevaluationboardfortheDAC7562andDAC8562.TheDAC7562andDAC8562arelow-power,voltage-output,12-or16-bitdigital-to-analogconverters(DACs).Theseconvertersarecontrolledthroughaserialperipheralinterface(SPI)thatcanoperateatclockratesofupto50MHz.Additionally,theseDACsincludea2.5Vinternalreferencevoltage(disabledbydefault),givingafull-scaleoutputrangeof5Vwhenplacedinagainoftwoconfiguration.TheEVMallowsevaluationofallaspectsofthedeviceandallowsusercontrolovereverypinontheDAC7562/DAC8562.Completecircuitdescriptions,schematicdiagrams,andbillsofmaterialareincludedinthisdocument.图3.DAC7562EVM评估板外形图DAC7562EVM评估板主要特性:•Full-featuredevaluationboardfortheDAC7562orDAC8562•Onboardoptionalexternalreferenceselection•WideselectionofdigitalandI/Ovoltages•Hardwareorsoftwarecontrolofcontrollogic•CompatiblewiththeTIModularEVMSystem•Onboardoptionalbipolarcircuitconfiguration(requiresinstallingcomponents)AO-Electronics傲壹电子官网：中文网：评估板材料清单: