MAX31865-cn-中文资料

MAX31865RTD至数字输出转换器概述MAX31865是简单易用的热敏电阻至数字输出转换器，优化用于铂电阻温度传感器(RTD)。外部电阻设置所用RTD的灵敏度，高精度Σ-Δ ADC将RTD电阻与参考阻值之比转换成数字输出。MAX31865输入具有高达±45V的过压保护，提供可配置的RTD及电缆开路/短路条件检测。应用工业设备医疗设备仪表特点和优点• 集成更低系统功耗，简化设计，减少设计周期• 简便的RTD铂电阻之数字转换器• 支持100Ω至1kΩ (0°C时)铂电阻RTD (PT100至PT1000) • 兼容于2线、3线和4线传感器连接• SPI兼容接口• 20引脚TQFN和SSOP封装 • 高精度设备满足误差预算• 15位ADC分辨率；标称温度分辨率为0.03125°C (随RTD非线性变化)• 整个工作条件下，总精度保持在0.5°C (0.05%满量程) • 全差分VREF输入• 转换时间：21ms (最大值)• 集成故障检测，增加系统稳定性• ±45V输入保护• 故障检测(RTD开路、RTD短路到量程范围以外的电压或 RTD元件短路)• SPI兼容接口典型应用电路典型应用电路还会在数据资料的最后给出。定购信息在数据资料的最后给出。Note:Somerevisionsofthisdevicemayincorporatedeviationsfrompublishedspecificationsknownaserrata.Multiplerevisionsofanydevicemaybesimultaneouslyavailablethroughvarioussaleschannels.Forinformationaboutdeviceerrata,goto::备有评估板MAX31865BIASREFIN+DVDDVDDGND1GND2DGNDREFIN-DRDYISENSORSDISCLKHOSTINTERFACECSSDON.C.FORCE-RREFRTDRCABLERCABLE0.1µFVDDFORCE+FORCE2RTDIN+RTDIN-CI*RCABLERCABLE0.1µFVDD4-WIRESENSORCONNECTION*CI=10nFFOR1kRTD100nFFOR100RTDForinformationonotherMaximproducts,visitMaxim’swebsiteat本文是英文数据资料的译文，文中可能存在翻译上的不准确或错误。如需进一步确认，请在您的设计中参考英文资料。有关价格、供货及订购信息，请联络Maxim亚洲销售中心：10800 852 1249 (北中国区)，10800 152 1249 (南中国区)，或访问Maxim的中文网站：。PRELIMINARYMAX31865RTD至数字输出转换器 2(VDD+0.3V)VoltageRangeonFORCE+,FORCE2,FORCE-,RTDIN+,RTDIN-RelativetoGND1....-50Vto+50VVoltageRangeonDVDDRelativetoDGND........-0.3Vto+4.0VVoltageRangeonAllDigitalPinsRelativetoDGND.............................-0.3Vto(VDVDD+0.3V)ContinuousPowerDissipation(TA=+70NC)TQFN(derate34.5mW/NCabove+70NC)...............2758.6mWSSOP(derate11.9mW/°Cabove+70°C)...............952.4mWESDProtection(allpins,HumanBodyModel)...................±2kVOperatingTemperatureRange........................-40NCto+125NCJunctionTemperature.....................................................+150NCStorageTemperatureRange............................-65NCto+150NCSolderingTemperature(reflow)......................................+260NCLeadTemperature(soldering,10s).................................+300NCTQFNJunction-to-AmbientThermalResistance(qJA)..........29°C/WJunction-to-CaseThermalResistance(qJC).................2°C/WSSOPJunction-to-AmbientThermalResistance(qJA)..........84°C/WJunction-to-CaseThermalResistance(qJC)...............32°C/WAbsoluteMaximumRatingsNote1:PackagethermalresistanceswereobtainedusingthemethoddescribedinJEDECspecificationJESD51-7,usingafour-layerboard.Fordetailedinformationonpackagethermalconsiderations,referto“AbsoluteMaximumRatings”maycausepermanentdamagetothedevice.Thesearestressratingsonly,andfunctionalopera-tionofthedeviceattheseoranyotherconditionsbeyondthoseindicatedintheoperationalsectionsofthespecificationsisnotimplied.Exposuretoabsolutemaximumratingconditionsforextendedperiodsmayaffectdevicereliability.PackageThermalCharacteristics(Note1)RecommendedDCOperatingConditions(TA=-40NCto+125NC,unlessotherwisenoted.)(Notes2and3)ElectricalCharacteristics(3.0VPVDDP3.6V,TA=-40NCto+125NC,unlessotherwisenoted.TypicalvaluesareTA=+25NC,VDD=VDVDD=3.3V.)(Notes2and3)MAX31865RTD-to-DigitalConverter│2PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSVDDVDD3.03.33.6VDVDDVDVDD3.03.33.6VInputLogic0VILCS,SDI,SCLK-0.30.3xVDVDDVInputLogic1VIHCS,SDI,SCLK0.7xVDVDDVDVDD+0.3VAnalogVoltages(FORCE+,FORCE2,FORCE-,RTDIN+,RTDIN-)Normalconversionresults0VBIASVReferenceResistorRREF35010kICableResistanceRCABLEPerlead050IPARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSADCResolutionNomissingcodes15BitsADCFull-ScaleInputVoltage(RTDIN+-RTDIN-)REFIN+-REFIN-VPRELIMINARYMAX31865RTD至数字输出转换器 3(continued)(3.0VPVDDP3.6V,TA=-40NCto+125NC,unlessotherwisenoted.TypicalvaluesareTA=+25NC,VDD=VDVDD=3.3V.)(Notes2and3)MAX31865RTD-to-DigitalConverter│3PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSADCCommon-ModeInputRange0VBIASVInputLeakageCurrentRTDIN+,RTDIN-,0NCto+70NC,on-state2nARTDIN+,RTDIN-,-40NCto+85NC,on-state5RTDIN+,RTDIN-,-40NCto100NC,on-state14BiasVoltageVBIAS1.952.002.06VBiasVoltageOutputCurrentIOUT0.25.75mABiasVoltageLoadRegulationIOUTP5.75mA30mV/mABiasVoltageStartupTime(Note4)10msADCFull-ScaleError±1LSBADCIntegralNonlinearityDifferentialInput,endpointfit,0.3xVBIASPVREFPVBIAS±1LSBADCOffsetError-3+3LSBNoise(overNyquistBandwidth)Inputreferred150FVRMSCommon-ModeRejection90dB50/60HzNoiseRejectionFundamentalandharmonics82dBTemperatureConversionTime(Note5)tCONVContinuousconversion(60Hznotch)16.717.6msSingleconversion(60Hznotch)5255Singleconversion(50Hznotch)62.566Continuousconversion(50Hznotch)2021AutomaticFaultDetectionCycleTimeFromCShightocyclecomplete550600FsPower-SupplyRejec