ADXL78中文资料

Single-Axis,High-g,iMEMS®AccelerometersADXL78Rev.AInformationfurnishedbyAnalogDevicesisbelievedtobeaccurateandreliable.However,noresponsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorotherrightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.NolicenseisgrantedbyimplicationorotherwiseunderanypatentorpatentrightsofAnalogDevices.Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.OneTechnologyWay,P.O.Box9106,Norwood,MA02062-9106,U.S.A.Tel:[phone]©2005AnalogDevices,Inc.Allrightsreserved.FEATURESCompleteaccelerationmeasurementsystemonasinglemonolithicICAvailablein±35g,±50g,or±70goutputfull-scalerangesFulldifferentialsensorandcircuitryforhighresistancetoEMI/RFIEnvironmentallyrobustpackagingCompletemechanicalandelectricalself-testondigitalcommandOutputratiometrictosupplySensitiveaxesintheplaneofthechipHighlinearity(0.2%offullscale)FrequencyresponsedowntodcLownoiseLowpowerconsumption(1.3mA)Tightsensitivitytoleranceand0goffsetcapabilityLargestavailableprefilterclippingheadroom400Hz,2-poleBesselfilterSingle-supplyoperationCompatiblewithSn/PbandPb-freesolderprocessesAPPLICATIONSVibrationmonitoringandcontrolVehiclecollisionsensingShockdetectionGENERALDESCRIPTIONTheADXL78isalowpower,completesingle-axisaccelerometerwithsignalconditionedvoltageoutputsthatareonasinglemonolithicIC.Thisproductmeasuresaccelerationwithafull-scalerangeof±35g,±50g,or±70g(minimum).Itcanalsomeasurebothdynamicacceleration(vibration)andstaticacceleration(gravity).TheADXL78isthefourth-generationsurfacemicromachinediMEMS®accelerometerfromADIwithenhancedperformanceandlowercost.Designedforuseinfrontandsideimpactairbagapplications,thisproductalsoprovidesacompletecost-effectivesolutionusefulforawidevarietyofotherapplications.TheADXL78istemperaturestableandaccurateovertheautomotivetemperaturerange,withaself-testfeaturethatfullyexercisesallthemechanicalandelectricalelementsofthesensorwithadigitalsignalappliedtoasinglepin.TheADXL78isavailableina5mm×5mm×2mm,8-terminalceramicLCCpackage.FUNCTIONALBLOCKDIAGRAM05368-001ADXL78VDDVSVDD2DIFFERENTIALSENSOREXCDEMODAMPXOUT400HzBESSELFILTERTIMINGGENERATORSELF-TESTFigure1.ADXL78Rev.A|Page2of12TABLEOFCONTENTSSpecifications.....................................................................................3AbsoluteMaximumRatings............................................................4ESDCaution..................................................................................4PinConfigurationandFunctionDescriptions.............................5TheoryofOperation........................................................................7Applications.......................................................................................8PowerSupplyDecoupling............................................................8Self-Test..........................................................................................8ClockFrequencySupplyResponse.............................................8SignalDistortion...........................................................................8OutlineDimensions..........................................................................9OrderingGuide.............................................................................9REVISIONHISTORY5/05—Rev.0toRev.AADXL78Rev.A|Page3of12SPECIFICATIONS1AtTA=−40°Cto+105°C,5.0Vdc±5%,acceleration=0g,unlessotherwisenoted.Table1.ModelNo.AD22279ModelNo.AD22280ModelNo.AD22281ParameterConditionsMinTypMaxMinTypMaxMinTypMaxUnitSENSOROutputFull-ScaleRangeIOUT≤±100μA375570gNonlinearity0.220.220.22%PackageAlignmentError111DegreeCross-AxisSensitivity−5+5−5+5−5+5%ResonantFrequency242424kHzSensitivity,Ratiometric(OverTemperature)VDD=5V,100Hz52.255557.7536.13839.925.652728.35mV/gOFFSETZero-gOutputVoltage(OverTemperature)2VOUT−VDD/2,VDD=5V−200+200−150+150−150+150mVNOISENoiseDensity10Hz−400Hz,5V1.131.431.83.5mg/√HzClockNoise555mVp-pFREQUENCYRESPONSE2-poleBessel−3dBFrequency360400440360400440360400440Hz−3dBFrequencyDrift25°CtoTMINorTMAX222HzSELF-TESTOutputChange(Cubevs.VDD)3VDD=5V440550660304380456216270324mVLogicInputHighVDD=5V3.53.53.5VLogicInputLowVDD=5V111VInputResistancePull-downresistortoGND305030503050kΩOUTPUTAMPLIFIEROutputVoltageSwingIOUT=±400μA0.25VDD−0.250.25VDD−0.250.25VDD−0.25VCapacitiveLoadDrive100010001000pFPREFILTERHEADROOM280400560gCFSR@400kHz543V/VPOWERSUPPLY(VDD)4.755.254.755.254.755.25VFunctionalRange3.563.563.56VQuiescentSupplyCurrentVDD=5V1.321.321.32mATEMPERATURERANGE−40+105−40+105−40+105°C1Allminimumandmaximumspecificationsareguaranteed.Typicalspecificationsarenotguaranteed.2Zerogoutputisratiometric.3Self-testoutputatVDD=(Self-TestOutputat5V)×(VDD/5V)3.ADXL78Rev.A|Page4of12ABSOLUTEMAXIMUMRATINGSTable2.ParameterRatingAcceleration(AnyAxis,Unpowered)4000gAcceleration(AnyAxis,Powered)4000gVS−0.3Vto+7.0VAllOtherPins(COM−0.3V)to(VS+0.3V)OutputShort-CircuitDuration(AnyPintoCommon)IndefiniteOperatingTemperatureRange−65°Cto+150°CStorageTemperature