标签: comparators

   8-BitEPROMMicrocontrollerswithAnalogComparators……

LPC900系列使用比较器低电池电压测量。AN10391LowbatteryvoltagemeasurementwiththeLPC900microcontrollersRev.01―3February2006ApplicationnoteDocumentinformationInfoContentKeywordsMicrocontrollers,lowbatterymeasurement,LPC900,comparatorsAbstractLowbatterymeasurementwiththeLPC900usingthecomparators.PhilipsSemiconductorsAN10391LowbatteryvoltagemeasurementwiththeLPC900microcontroolersRevisionhistoryRevDateDescription0120060203InitialrevisionContactinformationForadditionalinformation,pleasevisit:http://www.semiconductors.ph……

摘要：以下讨论验证了一个被现存A/D转换器应用所忽略的选择：有些条件下采用分立的比较器和D/A转换器更容易实现A/D转换。这种替代方案通常采用不同的测试方法，但是具有低成本、高速度、更大灵活性以及更低功耗等优点。利用比较器/DAC组合解决数据采集问题Mar01,2012摘要：以下讨论验证了一个被现存A/D转换器应用所忽略的选择：有些条件下采用分立的比较器和D/A转换器更容易实现A/D转换。这种替代方案通常采用不同的测试方法，但是具有低成本、高速度、更大灵活性以及更低功耗等优点。尽管当前趋势全部集中一个方向―设计者需要使用A/D转换器时通常选定一个集成的A/D转换器(ADC)。大多数工程师并没有意识到还有降低ADC性价比的其它替代方案。而模拟比较器、D/A转换器(DAC)和信号处理一起恰好就是构成逐次逼近ADC的核心电路。某些特定领域，分立比较器/DAC的使用非常普遍。自动测试设备、核脉冲反应堆高度监测器以及自动化时域反射计等，通常都采用这种技术，DAC用于驱动比较器的一个输入，另一个输入由被监测信号驱动。接下来是通用测试问题以及特定方法的选择，事实上，此时采用比较器/DAC组合比采用现成的ADC更受欢迎。瞬态电压分析捕获快速幅度变化事件(瞬态)的“强力”技术就是采用处理器支持的高速ADC和RAM对其进行简单量化(图1)。单触发事件可能必须采用这种方法，因为需要获取瞬态细节。然而，如果瞬态是重复性的，则可采用DAC/比较器的方法测量它们的峰值幅度及其它特性(图2)。图1.采用“强力”法进行瞬态分析，ADC电路耗电大且价格昂贵图2.如果图1应用可接受对幅度进行重复测量，用DAC/比较器组合替代ADC可省电并降低成本比较器的一个输入引脚由DAC设置判定电平，瞬态信号施加到另一个输入。通过调整DAC输出可确定峰值瞬态幅度，超越门限时，采用数字锁存捕获比较器的输出响应。仅需要比较器输入支持瞬态带宽，任意长的DAC输出建立时间并不会影响测量精度。这样，在模拟域可用低成本DAC和……

摘要：以下讨论验证了一个被现存A/D转换器应用所忽略的选择：有些条件下采用分立的比较器和D/A转换器更容易实现A/D转换。这种替代方案通常采用不同的测试方法，但是具有低成本、高速度、更大灵活性以及更低功耗等优点。利用比较器/DAC组合解决数据采集问题Mar01,2012摘要：以下讨论验证了一个被现存A/D转换器应用所忽略的选择：有些条件下采用分立的比较器和D/A转换器更容易实现A/D转换。这种替代方案通常采用不同的测试方法，但是具有低成本、高速度、更大灵活性以及更低功耗等优点。尽管当前趋势全部集中一个方向―设计者需要使用A/D转换器时通常选定一个集成的A/D转换器(ADC)。大多数工程师并没有意识到还有降低ADC性价比的其它替代方案。而模拟比较器、D/A转换器(DAC)和信号处理一起恰好就是构成逐次逼近ADC的核心电路。某些特定领域，分立比较器/DAC的使用非常普遍。自动测试设备、核脉冲反应堆高度监测器以及自动化时域反射计等，通常都采用这种技术，DAC用于驱动比较器的一个输入，另一个输入由被监测信号驱动。接下来是通用测试问题以及特定方法的选择，事实上，此时采用比较器/DAC组合比采用现成的ADC更受欢迎。瞬态电压分析捕获快速幅度变化事件(瞬态)的“强力”技术就是采用处理器支持的高速ADC和RAM对其进行简单量化(图1)。单触发事件可能必须采用这种方法，因为需要获取瞬态细节。然而，如果瞬态是重复性的，则可采用DAC/比较器的方法测量它们的峰值幅度及其它特性(图2)。图1.采用“强力”法进行瞬态分析，ADC电路耗电大且价格昂贵图2.如果图1应用可接受对幅度进行重复测量，用DAC/比较器组合替代ADC可省电并降低成本比较器的一个输入引脚由DAC设置判定电平，瞬态信号施加到另一个输入。通过调整DAC输出可确定峰值瞬态幅度，超越门限时，采用数字锁存捕获比较器的输出响应。仅需要比较器输入支持瞬态带宽，任意长的DAC输出建立时间并不会影响测量精度。这样，在模拟域可用低成本DAC和……

Abstract:Thisapplicationnotepresentsacircuitthatusesalow-powerCMOScomparatortoprovideanLEDvisualindicationofalow-batterycondition.ThisLBO(low-battery-indicator)isachievedbypulsingtheLEDatalowfrequencyandlowdutycycle.Thecircuitaccomplishesthiswithoutdrainingexcessivebatterycurrentthatcanleadtopermanentbatterydamageand,ultimately,hazardouswastedisposal.Thiscircuitalsohelpsconservebatterycurrentintheoffcyclebyplacingthecomparatorinshutdown.Equationsandcircuitanalysisareincludedfordeterminingdutycycleandcomparatortrippoints.Maxim>DesignSupport>TechnicalDocuments>ApplicationNotes>AmplifierandComparatorCircuits>APP1872Maxim>DesignSupport>TechnicalDocuments>ApplicationNotes>Automotive>APP1872Maxim>DesignSupport>TechnicalDocuments>ApplicationNotes>BatteryManagement>APP1872Keywords:comparator,lowbattery,LED,lowcost,lowpowerconsumption,comparatorsFeb03,2003APPLICATIONNOTE1872Low-BatteryIndicatorIsLowCost,HighlyEfficient,andEnvironmentallyFriendlyFeb03,2003Abstract:Thisapplicationnotepresentsacircuitthatusesalow-powerCMOScomparatortoprovideanLEDvisualindicationofalow-batterycondition.ThisLBO(low……

Abstract:Simpletestcircuitusingacomparatorandreferencetomeasurebatterydrain.Maxim>AppNotes>AMPLIFIERANDCOMPARATORCIRCUITSBATTERYMANAGEMENTMEASUREMENTCIRCUITSKeywords:comparator,reference,low-power,hysteresis,comparatorsSep30,2002APPLICATIONNOTE527SimpleCircuitMeasuresBatteryDrainAbstract:Simpletestcircuitusingacomparatorandreferencetomeasurebatterydrain.Measuringbatterylifeforaportablesystemisatime-consumingtask,andthemethodsthatacceleratebatterydischargedon'tprovidereliableresults.Intheusualapproachyousimplymeasureelapsedtimewhileoperatingtheproducttothepointofbatterydischarge.Runningseveralsuchsystemsinparallelobviouslygivesmoredata,ifyoucanaffordtotieupthelabequipment.Youcantrytoderivebatterylifefromdat……

Abstract:Asimplecircuitconsistingofacomparatorandanexclusive-ORgateissufficienttodoublethefrequencyofareferencesignal.Maxim/Dallas>AppNotes>AMPLIFIERANDCOMPARATORCIRCUITSKeywords:comparators,exclusive-ORgates,XORgates,frequencydoublersAug27,2004APPLICATIONNOTE3327SimpleCircuitDoublesInputFrequencyAsimplecircuitconsistingofacomparatorandanexclusive-ORgateissufficienttodoublethefrequencyofareferencesignal.Theversatilephase-lockedloop(PLL)allowsmultiplicationofareferencefrequencywithanoperatingfrequencythatrangesfrom"DCtodaylight."APLLisoverkillforsomeapplications,however,especiallyiftheinputfrequencyneedsonlytobedoubled.Forthosecasesasimplerapproach―suchasthecircuitinFigure1―willdothejobjustaswell.Figure1.Thiscircuitdoublestheinputfrequency.Thereferen……

Abstract:ThisLED-drivercircuitproducesa500HzPWMsignalwith2%nonlinearityanddutycycleadjustablefrom0to100%,usinga0V-to-5VDCcontrolsignal.Maxim>DesignSupport>AppNotes>AmplifierandComparatorCircuits>APP4502Maxim>DesignSupport>AppNotes>DisplayDrivers>APP4502Keywords:LEDdrivers,LEDdimming,pulse-widthmodulation,PWM,dualcomparatorsAug10,2010APPLICATIONNOTE4502Single-ICPWMModulatorHas2%LinearityBy:AhmadAyarAbstract:ThisLED-drivercircuitproducesa500HzPWMsignalwith2%nonlinearityanddutycycleadjustablefrom0to100%,usinga0V-to-5VDCcontrolsignal.AsimilarversionofthisarticleappearedintheAugust28,2008issueofElectronicDesignmagazine.SomeLED-drivercircuitsachievedimmingbyapplyingavariabledutycycle(PWM)totheLED……

Abstract:Achangeintheforwardvoltage(VF)forastringofseries-connected,high-brightnessLEDs(HBLEDs)canindicatedeteriorationorcompletefailureofoneormoreoftheLEDs.Accordingly,thiscircuitassessestheLED'shealthbymonitoringVF.Maxim>AppNotes>AmplifierandComparatorCircuitsDisplayDriversLEDLightingKeywords:high-brightnessLEDs,HBLEDs,forwardvoltage,differentialmeasurments,LEDdrivers,comparatorsJul30,2010APPLICATIONNOTE4479DiagnoseLEDsbyMonitoringtheSwitch-ModeDutyCycleBy:FonsJanssen,SeniorMemberoftheTechnicalStaffAbstract:Achangeintheforwardvoltage(VF)forastringofseries-connected,high-brightnessLEDs(HBLEDs)canindicatedeteriorationorcompletefailureofoneormoreoftheLEDs.Accordingly,thiscircuitassessestheLED'shealthbymonitoringVF.AsimilarversionofthisarticleappearedintheApril4,2009issueofEDNmagazine.Theforwardvoltage(VF)ofhigh-brightnessLEDs(HBLEDs)isoftenmonitoredtoassessthehealthof……

Abstract:Combiningalinear-modesingle-celllithium-ionbatterycharger(MAX1551)withacomparator(MAX9001)andn-channelFETaddsalayerofreverse-batteryprotectionthatprotectsasinglecelllithium-ionbatterychargerandbatteryfromdamageduetobackwardsinsertion.Maxim>AppNotes>AmplifierandComparatorCircuitsBatteryManagementCircuitProtectionKeywords:reversebatteryprotection,lithium-ionbatterycharger,comparators,n-channelFETsFeb16,2011APPLICATIONNOTE4572ReverseBatteryChargerProtectionBy:ZeeshawnShameem,CustomerApplicationsEngineerAbstract:Combiningalinear-modesingle-celllithium-ionbatterycharger(MAX1551)withacomparator(MAX9001)andn-channelFETaddsalayerofreverse-batteryprotectionthatprotectsasinglecelllithium-ionbatterychargerandbatteryfromdamageduetobackwardsinsertion.AsimilarversionofthisarticleappearedintheMarch1,2007issueofPETmagazine.Manybatterypoweredapplicationsusediodesforreversebatt……

Abstract:UsinganIC(MAX971)thatincludesanopen-draincomparatorandaprecision1%voltagereference,thiscircuitmonitorsthemagnitudeofanegativesupplyvoltageandprovidesadigitalwarningoffaultconditions.Tomonitormultiplenegativevoltages,usetheMAX974,whichincludesfourcomparators.Maxim>AppNotes>AmplifierandComparatorCircuitsMicroprocessorSupervisorCircuitsVoltageReferencesKeywords:negativesupplyvoltage,multi-railsystems,comparators,voltagereferencesDec07,2010APPLICATIONNOTE4543PrecisionCircuitMonitorsNegative-SupplyThresholdsBy:KevinBilkeAbstract:UsinganIC(MAX971)thatincludesanopen-draincomparatorandaprecision1%voltagereference,thiscircuitmonitorsthemagnitudeofanegativesupplyvoltageandprovidesadigitalwarningoffaultconditions.Tomonitormultiplenegativevoltages,usetheMAX974,whichincludesfourcomparators.AsimilarversionofthisarticleappearedintheFebruary8,2008issueofPortableDesignmagazine.Asimplebutac……

考和超低静态电流比较低电阻模拟开关生产7uA的静态电流（IQ）的分立元件的稳压电荷泵提供10毫安。Maxim>AppNotes>AmplifierandcomparatorcircuitsPower-supplycircuitsKeywords:chargepumps,regulatedchargepumps,quiescentcurrent,portabledevices,comparatorsSep24,2004APPLICATIONNOTE3330BuildaChargePumpwithUltra-LowQuiescentCurrent(Iq)Abstract:Combininglow-on-resistanceanalogswitcheswithareferenceandultra-lowquiescentcurrentcomparatorproducesadiscrete-componentregulatedchargepumpthatdelivers10mA,withonly7uAofquiescentcurrent(Iq).Portable,battery-powereddevicesoftenspendmostoftheirlifeinstandbymode,wherethequiescentcurrentofaninternalboostconverterbleedsthebatterycontinuously.Thequiescentcurrentduringstandbycanbelargerthantheactualloadcurrent.Thoughseveralinductor-ba……

摘要：该电路是一个偏远的IC温度传感器的简单和经济的接口。温度感应器（MAX6576），绝对温度-周期转换器，集成了必要的信号的电子传感器，连接到使用双绞线电缆进行电源和传感器的信号接收器（MAX9140比较）。Maxim>AppNotes>AmplifierandComparatorCircuitsTemperatureSensorsandThermalManagementKeywords:temperaturemeasurements,ICtemperaturesensors,temperature-to-periodconverters,comparators,twisted-paircableDec10,2010APPLICATIONNOTE4542LongTwistedPairReadsDigitalTemperatureSensorAbstract:ThiscircuitisasimpleandeconomicalinterfaceforremoteICthermalsensors.Thetemperaturesensor(MAX6576),anabsolutetemperature-to-periodconverterthatintegratesthesensorwiththenecessarysignalelectronics,connectstothereceiver(aMAX9140comparator)usingatwisted-paircablethatcarriespowertoandsignalsfromthesensor.AsimilarversionofthisarticleappearedintheNovember5,2007issueofElectronicDesignmagazine.Thebestchoicef……

摘要：本应用指南介绍了使用低功耗CMOS比较器提供LED视觉显示电池电量低条件的电路。这个杠杆收购(低电量）被通过脉冲，指示灯的低频率和低工作周期。电路实现此不排放过量电池当前也会导致永久性的电池损坏，并最终危险废物处置。这种电路还有助于节省电池当前关闭周期中通过将比较器放置在关机。包含用于确定责任周期和比较器之旅点方程和电路分析。Maxim>DesignSupport>TechnicalDocuments>ApplicationNotes>AmplifierandComparatorCircuits>APP1872Maxim>DesignSupport>TechnicalDocuments>ApplicationNotes>Automotive>APP1872Maxim>DesignSupport>TechnicalDocuments>ApplicationNotes>BatteryManagement>APP1872Keywords:comparator,lowbattery,LED,lowcost,lowpowerconsumption,comparatorsFeb03,2003APPLICATIONNOTE1872Low-BatteryIndicatorIsLowCost,HighlyEfficient,andEnvironmentallyFriendlyFeb03,2003Abstract:Thisapplicationnotepresentsacircuitthatusesalow-powerCMOScomparatortoprovideanLEDvisualindicationofalow-batterycondition.ThisLBO(low……

摘要：本应用笔记介绍了电路采用低功耗CMOS比较器提供低电池状态的LED视觉指示。这个杠杆收购（低电量指示灯）实现LED在低频率和低占空比脉冲。该电路实现不消耗电池电流过大，可导致永久性损害电池，最终，危险废物处置。该电路还有助于节省电池电流在开关周期由放置在关机的比较。方程和电路分析包括确定占空比和比较触发点。Maxim>DesignSupport>TechnicalDocuments>ApplicationNotes>AmplifierandComparatorCircuits>APP1872Maxim>DesignSupport>TechnicalDocuments>ApplicationNotes>Automotive>APP1872Maxim>DesignSupport>TechnicalDocuments>ApplicationNotes>BatteryManagement>APP1872Keywords:comparator,lowbattery,LED,lowcost,lowpowerconsumption,comparatorsFeb03,2003APPLICATIONNOTE1872Low-BatteryIndicatorIsLowCost,HighlyEfficient,andEnvironmentallyFriendlyFeb03,2003Abstract:Thisapplicationnotepresentsacircuitthatusesalow-powerCMOScomparatortoprovideanLEDvisualindicationofalow-batterycondition.ThisLBO(low……

摘要：简单测试电路使用一个比较器和参考测量电池漏。Maxim>AppNotes>AMPLIFIERANDCOMPARATORCIRCUITSBATTERYMANAGEMENTMEASUREMENTCIRCUITSKeywords:comparator,reference,low-power,hysteresis,comparatorsSep30,2002APPLICATIONNOTE527SimpleCircuitMeasuresBatteryDrainAbstract:Simpletestcircuitusingacomparatorandreferencetomeasurebatterydrain.Measuringbatterylifeforaportablesystemisatime-consumingtask,andthemethodsthatacceleratebatterydischargedon'tprovidereliableresults.Intheusualapproachyousimplymeasureelapsedtimewhileoperatingtheproducttothepointofbatterydischarge.Runningseveralsuchsystemsinparallelobviouslygivesmoredata,ifyoucanaffordtotieupthelabequipment.Youcantrytoderivebatterylifefromdat……

摘要：结合一个比较器（MAX9001）和n沟道FET线性模式单节锂离子电池充电器（MAX1551），增加了一个单细胞的锂离子电池充电器和电池从电池反向保护层，保护由于向后插入的破坏。Maxim>AppNotes>AmplifierandComparatorCircuitsBatteryManagementCircuitProtectionKeywords:reversebatteryprotection,lithium-ionbatterycharger,comparators,n-channelFETsFeb16,2011APPLICATIONNOTE4572ReverseBatteryChargerProtectionBy:ZeeshawnShameem,CustomerApplicationsEngineerAbstract:Combiningalinear-modesingle-celllithium-ionbatterycharger(MAX1551)withacomparator(MAX9001)andn-channelFETaddsalayerofreverse-batteryprotectionthatprotectsasinglecelllithium-ionbatterychargerandbatteryfromdamageduetobackwardsinsertion.AsimilarversionofthisarticleappearedintheMarch1,2007issueofPETmagazine.Manybatterypoweredapplicationsusediodesforreversebatt……

摘要：电流检测放大器，双比较器，外部CMOS开关的组合，可以用来防止极性反接电池或负载短路的破坏性影响。Maxim>AppNotes>CircuitProtectionKeywords:currentsenseamplifier,comparator,overloadprotection,comparators,currentoverload,batteryprotectionJan31,2001APPLICATIONNOTE731OverloadCircuitryProtectsBatteriesandPowerSuppliesAbstract:Acombinationofcurrent-senseamplifier,dual-comparator,andexternalCMOSswitchescanbeusedtopreventthedamagingeffectsofareversed-polaritybatteryorshort-circuitload.Themostwidelyuseddeviceforovercurrentprotectionisasimplefuse.Highcurrentduetoanoverloadheatsthefusiblemetalliclink,causingittomeltandopenthecircuit.Thefuseissimpleandeconomical.However,fuses'relativelylongreactiontime,highresistance,andneedforreplacementmakethemimpracticalforsomeapplications.Al……

摘要：在黑暗的损失（由光敏电阻检测）的交流电源接通电池供电白光LED阵列。为了节省电能，定时器关闭后的特定时间内的LED（例如，10分钟Maxim>AppNotes>AmplifierandComparatorCircuitsDisplayDriversKeywords:Emergencylighting,whiteLEDs,lightdetection,photoresistor,comparatorsFeb16,2005APPLICATIONNOTE3444LightIsOnWhenPowerIsOutAbstract:AlossofACpowerduringdarkness(sensedbyaphotoresistor)turnsonanarrayofbattery-poweredwhiteLEDs.Toconservepower,atimerturnsofftheLEDsafteraparticularperiodoftime(forexample,10minutes).Poweroutagescanoccurwhenleastexpected,leavingyouintotaldarkness.Whetherinahospital,atheater,oryourhome,suchoccasionscallforanemergencylightingsystemthatturnsonautomaticallywithlossofpower.ThepreferredemergencylightsourceisthewhiteLED,whichisgainingpopularityasacompact,power-……

摘要：此LED驱动电路产生500HzPWM信号与2%非线性和责任周期可调从0到100%，使用0V-5VDC控制信号。Maxim>DesignSupport>AppNotes>AmplifierandComparatorCircuits>APP4502Maxim>DesignSupport>AppNotes>DisplayDrivers>APP4502Keywords:LEDdrivers,LEDdimming,pulse-widthmodulation,PWM,dualcomparatorsAug10,2010APPLICATIONNOTE4502Single-ICPWMModulatorHas2%LinearityBy:AhmadAyarAbstract:ThisLED-drivercircuitproducesa500HzPWMsignalwith2%nonlinearityanddutycycleadjustablefrom0to100%,usinga0V-to-5VDCcontrolsignal.AsimilarversionofthisarticleappearedintheAugust28,2008issueofElectronicDesignmagazine.SomeLED-drivercircuitsachievedimmingbyapplyingavariabledutycycle(PWM)totheLED……