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MaximMAX1120024位超低功耗模数转换方案关键字：工业控制,传感器,数据采集,测试测量Maxim公司的MAX11200是24位单路超低功耗串行输出的Delta-Sigma模数转换器(ADC),提供高精度振荡器,从而不需要外接元件,内部的数字滤波器能对50Hz或60Hz提供大于100dB的抑制,采用SPI接口,数字可编程增益1,2,4,8或16,主要用在温度和压力传感器测量,手提仪表和电池应用.本文介绍了MAX11200/MAX11210主要特性,方框图和磁力复原衡器电路图以及MAX11200/MAX11210评估板主要特性,电路图,材料清单和元件布局图.MAX11200/210:24-Bit,Single-Channel,Ultra-Low-Power,Delta-SigmaADCswithGPIOTheMAX11200/MAX11210areultra-low-power(300FAactivecurrent),high-resolution,serialoutputADCs.Thesedevicesprovidethehighestresolutionperunitpowerintheindustry,andareoptimizedforapplicationsthatrequireveryhighdynamicrangewithlowpower,suchassensorsona4mAto20mAindustrialcontrolloop.Optionalinputbuffersprovideisolationofthesignalinputsfromtheswitchedcapacitorsamplingnetworkallowingtheseconverterstobeusedwithhigh-impedancesourceswithoutcompromisingavailabledynamicrangeorlinearity.Thedevicesprovideahigh-accuracyinternaloscillatorthatrequiresnoexternalcomponents.Whenusedwiththespecifieddatarates,theinternaldigitalfilterprovidesmorethan100dBrejectionof50Hzor60Hzlinenoise.ThedevicesareconfigurableusingtheSPI™interfaceandincludefourGPIOsthatcanbeusedforexternalmuxcontrol.TheMAX11210includesdigitalprogrammablegainof1,2,4,8,or16.TheMAX11200/MAX11210operateoverthe-40NCto+85NCtemperaturerange,andareavailableina16-pinQSOPpackage.MAX11200/MAX11210主要特性:24.0-BitENOBat5sps20.9-BitNoise-FreeResolutionat10sps19-BitNoise-FreeResolutionat120sps570nVRMSNoiseat10sps,Q3.6VFSInput1ppmINL(typ),10ppm(max)NoMissingCodesUltra-LowPowerDissipationOperating-ModeCurrentDrain300μA(max)Sleep-ModeCurrentDrain0.4μAProgrammableGain(1,2,4,8,or16)(MAX11210)FourSPI-ControlledGPIOsforExternalMuxControl2.7Vto3.6VAnalogSupplyVoltageRange1.7Vto3.6VDigitalandI/OSupplyVoltageRangeFullyDifferentialSignalandReferenceInputsHigh-ImpedanceInputsOptionalInputBuffersonBothSignalandReferenceInputsProgrammableInternalClockorExternalClockMode100dB(min)50Hz/60HzRejectionSPI,QSPI™,MICROWIRE™-CompatibleSerialInterfaceOn-DemandOffsetandGainSelf-CalibrationandSystemCalibrationUser-ProgrammableOffsetandGainRegisters-40℃to+85℃OperatingTemperatureRangeQ2kVESDProtectionLead(Pb)-FreeandRoHS-CompliantQSOPPackageMAX11200/MAX11210应用:SensorMeasurement(TemperatureandPressure)PortableInstrumentationBatteryApplicationsWeighScales图1.MAX11200/MAX11210方框图图2.MAX11200/MAX11210磁力复原衡器电路图MAX11200/MAX11210评估板TheMAX11200,MAX11206,MAX11209,MAX11210,andMAX11213evaluationkits(EVkits)consistofoneMAX11200,MAX11206,MAX11209,MAX11210,orMAX11213evaluationboardandsoftware.TheEVkitsarefullyassembledandtestedcircuitboardsthatevaluatetheMAX11200familyofultra-low-power,high-resolution,serialoutputADCs.TheEVkitsincludeWindowsXP®-,WindowsVista®-,andWindows®7-compatiblesoftwarethatprovidesagraphicaluserinterface(GUI)forexercisingthefeaturesoftheMAX11200familyofdataconverters.TheEVkitsareconnectedtoaPCthroughaUSBA-to-Bcable.MAX11200/MAX11210评估板主要特性:WindowsXP-,WindowsVista-,andWindows7-CompatibleSoftwareUSB-PCConnection(CableIncluded)USBPowered(NoExternalPowerSupplyRequired)On-BoardIsolatedPowerSuppliesRejectingPowerLineNoiseOn-BoardOptocouplersIsolatingADCfromOtherCircuitryReal-TimeDataAcquisitionthroughUSBProvenPCBLayout图3.MAX11200/MAX11210评估板电路图(1)图4.MAX11200/MAX11210评估板电路图(2)MAX11200/MAX11210评估板元件表:AO-Electronics傲壹电子官网：中文网：评估板元件布局图