聚洵低功耗運(yùn)算放大器GS8331-GS8332-GS834

GS8331GS8332GS8334描述GS8331GS8332GS8334放大器是單/雙/四電源，微功耗，零漂移CMOS運(yùn)算放大器，這些放大器提供350kHz的帶寬，軌至軌輸入和輸出以及1.8V至5.5V的單電源供電。GS833X使用斬波穩(wěn)定技術(shù)來(lái)提供非常低的失調(diào)電壓（最大值小于10μV），并且在整個(gè)溫度范圍內(nèi)漂移接近零。每個(gè)放大器具有25μA的低靜態(tài)電源電流，以及20pA的極低輸入偏置電流，使該器件成為低失調(diào)，低功耗和高阻抗應(yīng)用的理想選擇。GS833X提供了出色的CMRR，而沒(méi)有與傳統(tǒng)的互補(bǔ)輸入級(jí)相關(guān)的分頻器。這種設(shè)計(jì)在驅(qū)動(dòng)模數(shù)轉(zhuǎn)換器（ADC）方面具有卓越的性能，而不會(huì)降低差分線性度。GS8331GS8332GS8334應(yīng)用?換能器應(yīng)用?手持測(cè)試設(shè)備?溫度測(cè)量?電池供電的儀器?電子秤Features?Single-SupplyOperationfrom+1.8V~+5.5V?EmbeddedRFAnti-EMI?Rail-to-RailInput/Output?SmallPackage:?Gain-BandwidthProduct:350KHz@25°C)GS8331inSOT23-5,SC70-5andSOP-8?InputCurrent:20pA@25°C)Packages?Offset10uV(Max.@25°C)GS8332inSOP-8,MSOP-8and?QuiescentCurrent:25μAperAmplifierPackages?Operating-45°C~+125°CGS8334inSOP-14andTSSOP-14Packages?ZeroDrift:GeneralDescriptionApplications?傳感器應(yīng)用 ?手持測(cè)試設(shè)備?溫度測(cè)量 ?電池供電的儀器?電子秤PinConfigurationFigure1.AssignmentDiagramAbsoluteMaximumRatingsConditionMinMaxPowerSupply(VDDVss)-0.5V+7.5VAnalogInput(IN+orVss-0.5VVDD+0.5VPDBInputVss-0.5V+7VOperatingRange-45°C+125°CJunction+160°CStorageRange-55°C+150°CLead(soldering,10sec)+260°CPackageThermalResistance(T=+25)SOP-8,θJA125MSOP-8,θJA216SOT23-5,θJA190ESDSusceptibilityHBM6KV400VNote:StressgreaterthanlistedunderAbsoluteMaximumRatingsmaycausepermanentdamagethedevice.Thisastressratingonlyandfunctionaloperationofdeviceattheseorotherconditionsoutsidethoseindicatedinoperationalsectionsofthisspecificationnotimplied.ExposuretoabsolutemaximumratingconditionsforextendedperiodsmayaffectPackage/OrderingInformationMODELCHANNELORDERNUMBERDESCRIPTIONOPTIONMARKINGGS8331-TRSOT23-5 andReel,3000GS8331-CRSC70-5 andReel,3000GS8331Single GS8331-SR SOP-8 andReel,4000GS8331SOT23-5 andReel,3000SC70-5 andReel,3000GS8332-SRSOP-8 andReel,4000GS8332GS8332Dual GS8332-MR MSOP-8 andReel,3000GS8332GS8332-FRDFN-8andReel,3000 GS8332GS8334QuadGS8334-TRTSSOP-14andReel,3000GS8334GS8334-SRSOP-14andReel,2500GS8334ElectricalCharacteristics(AtVs=5V,=+25,VCM=VS/2,RL=10K?,unlessotherwisenoted.)CONDITIONS MINTYPUNITSINPUTCHARACTERISTICSInput(VOS)210μVInputBiasCurrent(I)20pAInputCurrent(IOS)10pACommon-ModeRejectionRatio(CMRR)VCM=0Vto5VdBLargeSignalGain(A)RL=10k?,VO=0.3V4.7V145dBInputDrift(?V/?T)5070nV/OUTPUTCHARACTERISTICSOutputHigh(VOH)RL=100k?to-VS4.998VRL=10k?to-VS4.994VOutputLow(VOL)RL=100k?to+VS5mVRL=10k?to+VS20mVShortCircuitLimit)RL=10?to-VS20mAOutputCurrent(IO)30mAPOWERPowerSupplyRejectionRatio(PSRR)VS=2.5Vto5.5V dBQuiescentCurrent(IQ)VO=RL=0?25μADYNAMICPERFORMANCEGain-BandwidthProductG=+100350KHzSlewRate(SR)RL=10k?0.2V/μsNOISEPERFORMANCENoisenp-p)0Hzto10Hz1.1μVP-PNoiseDensity(en)f=1kHz70nV/HzTypicalPerformancecharacteristics=+25°C,Vs=5V,RLk?connectedtoV/2VOUT=V/2,unlessotherwisenoted.)LargeSignalResponseLargeSignalResponseCL=0pFG=+1CL=0pFG=+1Time(4μs/div)PositiveOvervoltageRecoveryNegativeOvervoltageRecoveryV=2.5VVIN=-200mVp-p(RETtoGND)CL=0pFRL=10k?AV=-10V=2.5VVIN=-200mVp-p(RETtoGND)CL=0pFRL=10k?AV=-10(50μs/div)(50μs/div)OpenLoopGain,PhaseShiftvs.FrequencySupplyCurrentvs.PhaseShiftVS=5.5VOpenLoopVs=1.8VFrequency(Hz)()TypicalPerformancecharacteristics=+25°C,Vs=5V,RLk?connectedtoV/2VOUT=V/2,unlessotherwisenoted.)OutputSwingvs.OutputCurrentatOutputSwingvs.OutputCurrentat+5VSourcingCurrent

SourcingCurrent12525-4012525-40SinkingCurrent

SinkingCurrentOutputCurrent(mA)OutputCurrent(mA)ApplicationNoteGGS833X系列運(yùn)算放大器具有單位增益穩(wěn)定的特性，適用于多種通用應(yīng)用。GS833X系列封裝的占地面積小，可以節(jié)省印刷電路板上的空間，并可以設(shè)計(jì)更小的電子產(chǎn)品。電源旁路和電路板布局GS833X系列采用1.8V至5.5V單電源或±0.9V至±2.75V雙電源供電。為了獲得最佳性能，在單電源供電模式下，應(yīng)將一個(gè)0.1pF的陶瓷電容器靠近VDD引腳放置。對(duì)于雙電源供電，應(yīng)使用單獨(dú)的0.1pF陶瓷電容器將VDD和VSS電源均旁路到地。低電源電流GS833X系列的低電源電流（每通道典型值為25uA）將有助于最大程度地延長(zhǎng)電池壽命。它們是電池供電系統(tǒng)的理想選擇工作電壓GS833X系列在寬輸入電源電壓（1.8V至5.5V）下工作。此外，所有溫度規(guī)格適用于-45oC至+125oC。在整個(gè)工作電壓范圍內(nèi)，大多數(shù)行為保持不變。這些保證確保在單節(jié)鋰離子電池的整個(gè)使用壽命中都可以運(yùn)行軌到軌輸入GS833X系列的輸入共模范圍超出電源軌100mV（VSS-0.1V至VDD+0.1V）。這是通過(guò)使用互補(bǔ)輸入級(jí)來(lái)實(shí)現(xiàn)的。對(duì)于正常操作，輸入應(yīng)限制在此范圍內(nèi)。軌到軌輸出軌到軌輸出擺幅可在輸出端提供最大可能的動(dòng)態(tài)范圍。在低電源電壓下運(yùn)行時(shí)，這一點(diǎn)尤其重要。GS833X系列的輸出電壓在輕阻負(fù)載（>100kΩ）時(shí)通常可從供電軌擺動(dòng)至小于5mV，而在中等阻性負(fù)載（10kΩ）時(shí)可供電至100mV。容性負(fù)載公差GS833x系列針對(duì)帶寬和速度進(jìn)行了優(yōu)化，而不是用于驅(qū)動(dòng)電容性負(fù)載。輸出電容將在放大器的反饋路徑中形成一個(gè)極點(diǎn)，從而導(dǎo)致過(guò)度的峰值和電勢(shì)振蕩。如果需要使用負(fù)載電容，則要考慮的兩種策略是（1）使用與放大器的輸出和負(fù)載電容串聯(lián)的小電阻，以及（2）通過(guò)增加放大器的反饋環(huán)路來(lái)減小放大器反饋環(huán)路的帶寬。總體噪聲增益。圖2.顯示了采用串聯(lián)電阻器策略的單位增益跟隨器。電阻將輸出與電容隔離，更重要的是，在反饋路徑中產(chǎn)生一個(gè)零，以補(bǔ)償由輸出電容產(chǎn)生的極點(diǎn)Figure2.IndirectlyDrivingaCapacitiveLoadUsingIsolationResistorbiggertheRISOresistorvalue,themorestableVOUTwillbe.ifthereisaresistiveloadRLparallelthecapacitiveload,avoltagedivider(proportionaltoRISO/RL)isformed,thiswillresultagaincircuitinFigure3animprovementtotheoneinFigure2.RFprovidestheDCaccuracybyfeed-forwardtheVINtoRL.CFandRISOservetocounteractlossofphasemarginbyfeedinghighfrequencycomponentoftheoutputsignalbacktoamplifier’sinvertinginput,therebypreservingphasemarginintheoverallfeedbackloop.CapacitivedrivecanincreasedbyincreasingvalueofCF.Thisinturnwillslowdownthepulseresponse.CFRF-RVVIN+CLRLFigure3.IndirectlyDrivingaCapacitiveLoadDCAccuracyTypicalApplicationCircuitsDifferentialamplifierdifferentialamplifierallowsthesubtractionofinputvoltagesorcancellationofasignalcommontheinputs.Itusefulasacomputationalamplifiermakingadifferentialtosingle-endconversionorrejectingacommonmodesignal.Figure4.shownthedifferentialamplifierusingGS833X.Figure4.DifferentialAmplifierR+V?2V+()V124123RRRRRRV()=OUTR1RRRRINIPRREF341341Iftheresistorratiosare(i.e.R1=R3andR2=R4),thenOUT=V?V+R2(V)RINIP1VREFFilterlowpassactivefilterisinFigure5.TheDCgaindefinedby–R2/R1.filterhasa-20dB/decaderoll-offitscornerfrequency?C=1/(2πR31).Figure5.PassActiveFilterInstrumentationAmplifierFigure6.InstrumentAmplifier.PackageInformationDF