2.3ios5

REV.
BInformationfurnishedbyAnalogDevicesisbelievedtobeaccurateandreliable.
However,noresponsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorotherrightsofthirdpartiesthatmayresultfromitsuse.
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aOP37OneTechnologyWay,P.
O.
Box9106,Norwood,MA02062-9106,U.
S.
A.
Tel:781/329-4700www.
analog.
comFax:781/326-8703AnalogDevices,Inc.
,2002LowNoise,Precision,HighSpeedOperationalAmplifier(AVCL>5)SIMPLIFIEDSCHEMATICV–V+Q2BR2*Q3Q2AQ1AQ1BR4R1*R318VOSADJ.
R1ANDR2AREPERMANENTLYADJUSTEDATWAFERTESTFORMINIMUMOFFSETVOLTAGE.
*NON-INVERTINGINPUT(+)INVERTINGINPUT(–)Q6Q21C2R23R24Q23Q24Q22R5Q11Q12Q27Q28C1R9R12C3C4Q26Q20Q19Q46Q45OUTPUTFEATURESLowNoise,80nVp-p(0.
1Hzto10Hz)3nV/÷Hz@1kHzLowDrift,0.
2V/CHighSpeed,17V/sSlewRate63MHzGainBandwidthLowInputOffsetVoltage,10VExcellentCMRR,126dB(Common-Voltage@11V)HighOpen-LoopGain,1.
8MillionReplaces725,OP-07,SE5534InGains>5AvailableinDieFormGENERALDESCRIPTIONTheOP37providesthesamehighperformanceastheOP27,butthedesignisoptimizedforcircuitswithgainsgreaterthanfive.
Thisdesignchangeincreasesslewrateto17V/msandgain-bandwidthproductto63MHz.
TheOP37providesthelowoffsetanddriftoftheOP07plushigherspeedandlowernoise.
Offsetsdownto25mVandamaximumdriftof0.
6mV/∞CmaketheOP37idealforpreci-sioninstrumentationapplications.
Exceptionallylownoise(en=3.
5nV/@10Hz),alow1/fnoisecornerfrequencyof2.
7Hz,andthehighgainof1.
8million,allowaccuratehigh-gainamplificationoflow-levelsignals.
Thelowinputbiascurrentof10nAandoffsetcurrentof7nAareachievedbyusingabias-currentcancellationcircuit.
OverthemilitarytemperaturerangethistypicallyholdsIBandIOSto20nAand15nArespectively.
PINCONNECTIONS8-LeadHermeticDIP(ZSuffix)EpoxyMini-DIP(PSuffix)8-LeadSO(SSuffix)87651234NC=NOCONNECTVOSTRIM–IN+INVOSTRIMV+OUTNCV–OP37Theoutputstagehasgoodloaddrivingcapability.
Aguaranteedswingof10Vinto600WandlowoutputdistortionmaketheOP37anexcellentchoiceforprofessionalaudioapplications.
PSRRandCMRRexceed120dB.
Thesecharacteristics,coupledwithlong-termdriftof0.
2mV/month,allowthecircuitdesignertoachieveperformancelevelspreviouslyattainedonlybydiscretedesigns.
Low-cost,high-volumeproductionoftheOP37isachievedbyusingon-chipzener-zaptrimming.
Thisreliableandstableoffsettrimmingschemehasproveditseffectivenessovermanyyearsofproductionhistory.
TheOP37bringslow-noiseinstrumentation-typeperformancetosuchdiverseapplicationsasmicrophone,tapehead,andRIAAphonopreamplifiers,high-speedsignalconditioningfordataacquisitionsystems,andwide-bandwidthinstrumentation.
OP37*PRODUCTPAGEQUICKLINKSLastContentUpdate:02/23/2017COMPARABLEPARTSViewaparametricsearchofcomparableparts.
EVALUATIONKITSEVAL-OPAMP-1EvaluationBoardDOCUMENTATIONApplicationNotesAN-356:User'sGuidetoApplyingandMeasuringOperationalAmplifierSpecificationsAN-358:NoiseandOperationalAmplifierCircuitsAN-649:UsingtheAnalogDevicesActiveFilterDesignToolAN-940:LowNoiseAmplifierSelectionGuideforOptimalNoisePerformanceDataSheetOP37:LowNoise,Precision,HighSpeedOperationalAmplifier(AVCL>5)DataSheetTOOLSANDSIMULATIONSOP37SPICEMacro-ModelDESIGNRESOURCESOP37MaterialDeclarationPCN-PDNInformationQualityAndReliabilitySymbolsandFootprintsDISCUSSIONSViewallOP37EngineerZoneDiscussions.
SAMPLEANDBUYVisittheproductpagetoseepricingoptions.
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Thisdynamicpagemaybefrequentlymodified.
REV.
BOP37–2–ABSOLUTEMAXIMUMRATINGS4SupplyVoltage22VInternalVoltage(Note122VOutputShort-CircuitDurationIndefiniteDifferentialInputVoltage(Note2)0.
7VDifferentialInputCurrent(Note2)25mAStorageTemperatureRange65∞Cto+150∞COperatingTemperatureRangeOP37A55∞Cto+125∞COP37E(Z)25∞Cto+85∞COP37E,OP-37F(P)0∞Cto70∞COP37G(P,S,Z)40∞Cto+85∞CLeadTemperatureRange(Soldering,60sec)300∞CJunctionTemperature45∞Cto+150∞CPackageTypeJA3JCUnit8-LeadHermeticDIP(Z)14816∞C/W8-LeadPlasticDIP(P)10343∞C/W8-LeadSO(S)15843∞C/WNOTES1Forsupplyvoltageslessthan22V,theabsolutemaximuminputvoltageisequaltothesupplyvoltage.
2TheOP37'sinputsareprotectedbyback-to-backdiodes.
Currentlimitingresistorsarenotusedinordertoachievelownoise.
Ifdifferentialinputvoltageexceeds0.
7V,theinputCurrentshouldbelimitedto25mA.
3JAisspecifiedforworstcasemountingconditions,i.
e.
,JAisspecifiedfordeviceinsocketforTO,CerDIP,P-DIP,andLCCpackages;JAisspecifiedfordevicesolderedtoprintedcircuitboardforSOpackage.
4AbsolutemaximumratingsapplytobothDICEandpackagedparts,unlessotherwisenoted.
ORDERINGGUIDETA=25∞COperatingVOSMAXCerDIPPlasticTemperature(V)8-Lead8-LeadRange25OP37AZ*MIL25OP37EZOP37EPIND/COM60OP37FP*IND/COM100OP37GPXIND100OP37GZOP37GSXIND*Notfornewdesign,obsolete,April2002.
CAUTIONESD(electrostaticdischarge)sensitivedevice.
Electrostaticchargesashighas4000Vreadilyaccumulateonthehumanbodyandtestequipmentandcandischargewithoutdetection.
AlthoughtheOP37featuresproprietaryESDprotectioncircuitry,permanentdamagemayoccurondevicessubjectedtohigh-energyelectrostaticdischarges.
Therefore,properESDprecautionsarerecommendedtoavoidperformancedegradationorlossoffunctionality.
WARNING!
ESDSENSITIVEDEVICEREV.
B–3–OP37SPECIFICATIONS(VS=15V,TA=25C,unlessotherwisenoted.
)OP37A/EOP37FOP37GParameterSymbolConditionsMinTypMaxMinTypMaxMinTypMaxUnitInputOffsetVoltageVOSNote11025206030100mVLong-TermStabilityVOS/TimeNotes2,30.
21.
00.
31.
50.
42.
0mV/MoInputOffsetCurrentIOS7359501275nAInputBiasCurrentIB±10±40±12±55±15±80nAInputNoiseVoltageenp-p1Hzto10Hz3,50.
080.
180.
080.
180.
090.
25mVp-pInputNoiseVoltageDensityenfO=10Hz33.
55.
53.
55.
53.
88.
0fO=30Hz33.
14.
53.
14.
53.
35.
6nV/÷HzfO=1000Hz33.
03.
83.
03.
83.
24.
5InputNoiseCurrentDensityiNfO=10Hz3,61.
74.
01.
74.
01.
7fO=30Hz3,61.
02.
31.
02.
31.
0pA/÷HzfO=1000Hz3,60.
40.
60.
40.
60.
40.
6InputResistanceDifferentialModeRINNote71.
360.
9450.
74MWInputResistanceCommonModeRINCM32.
52GWInputVoltageRangeIVR±11±12.
3±11±12.
3±11±12.
3VCommonModeRejectionRatioCMRRVCM=±11V114126106123100120dBPowerSupplyRejectionRatioPSSRVS=±4V110110220mV/Vto±18VLargeSignalVoltageGainAVORL≥2kW,VO=±10V10001800100018007001500V/mVRL≥1kW,Vo=±10V800150080015004001500V/mVRL≥600W,VO=±1V,VS±44250700250700200500V/mVOutputVoltageSwingVORL≥2kW±12.
0±13.
8±12.
0±13.
8±11.
5±13.
5VRL≥600W±10±11.
5±10±11.
5±10±11.
5VSlewRateSRRL≥2kW4111711171117V/msGainBandwidthProductGBWfO=10kHz4456345634563MHzfO=1MHz404040MHzOpen-LoopOutputResistanceROVO=0,IO=0707070WPowerConsumptionPdVO=09014090140100170mWOffsetAdjustmentRangeRP=10kW±4±4±4mVNOTES1Inputoffsetvoltagemeasurementsareperformedbyautomatedtestequipmentapproximately0.
5secondsafterapplicationofpower.
A/Egradesguaranteedfullywarmedup.
2LongterminputoffsetvoltagestabilityreferstotheaveragetrendlineofVOSvs.
Timeoverextendedperiodsafterthefirst30daysofoperation.
Excludingtheinitialhourofoperation,changesinVOSduringthefirst30daysaretypically2.
5mV—refertotypicalperformancecurve.
3Sampletested.
4Guaranteedbydesign.
5Seetestcircuitandfrequencyresponsecurvefor0.
1Hzto10Hztester.
6Seetestcircuitforcurrentnoisemeasurement.
7Guaranteedbyinputbiascurrent.
REV.
B–4–OP37–SPECIFICATIONSElectricalCharacteristicsOP37AOP37CParameterSymbolConditionsMinTypMaxMinTypMaxUnitInputOffsetVoltageVOSNote1102530100mVAverageInputOffsetDriftTCVOSNote2TCVOSNNote30.
20.
60.
41.
8mV/∞CInputOffsetCurrentIOS155030135nAInputBiasCurrentIB±20±60±35±150nAInputVoltageRangeIVR±10.
3±11.
5±10.
2±11.
5VCommonModeRejectionRatioCMRRVCM=±10V10812294116dBPowerSupplyRejectionRatioPSRRVS=±4.
5Vto±18V216451mV/VLarge-SignalVoltageGainAVORL≥2kW,VO=±10V6001200300800V/mVOutputVoltageSwingVORL≥2kW±11.
5±13.
5±10.
5±13.
0VElectricalCharacteristicsOP37EOP37FOP37CParameterSymbolConditionsMinTypMaxMinTypMaxMinTypMaxUnitInputOffsetVoltageVOS20504014055220mVAverageInputOffsetDriftTCVOSNote2TCVOSNNote30.
20.
60.
31.
30.
41.
8mV/∞CInputOffsetCurrentIOS1050148520135nAInputBiasCurrentIB±14±60±18±95±25±150nAInputVoltageRangeIVR±10.
5±11.
8±10.
5±11.
8±10.
5±11.
8VCommonModeRejectionRatioCMRRVCM=±10V10812210011994116dBPowerSupplyRejectionRatioPSRRVS=±4.
5Vto±18V215216432mV/VLarge-SignalVoltageGainAVORL≥2kW,VO=±10V750150070013004501000V/mVOutputVoltageSwingVORL≥2kW±11.
7±13.
6±11.
4±13.
5±11±13.
3VNOTES1Inputoffsetvoltagemeasurementsareperformedbyautomatedtestequipmentapproximately0.
5secondsafterapplicationofpower.
A/Egradesguaranteedfullywarmedup.
2TheTCVOSperformanceiswithinthespecificationsunnulledorwhennulledwithRP=8kWto20kW.
TCVOSis100%testedforA/Egrades,sampletestedforF/Ggrades.
3Guaranteedbydesign.
(VS=15V,–55C0C0CforOP37EP/FP,and–40C03520060100mVMAXInputOffsetCurrentIOS5035855075nAMAXInputBiasCurrentIB±60±40±95±55±80nAMAXInputVoltageRangeIVR±10.
3±11±10.
3±11±11VMINCommonModeRejectionRatioCMRRVCM=±11V108114100106100dBMINPowerSupplyRejectionRatioPSRRTA=25∞C,VS=±4Vto±18V1010101020mV/VMAXTA=125∞C,VS=±4.
5Vto±18V1620mV/VMAXLarge-SignalVoltageGainAVORL≥2kW,VO=±10V60010005001000700V/mVMINRL≥1kW,VO=±10V800800V/mVMINOutputVoltageSwingVORL≥2kW±11.
5±12±11±12±11.
5VMINRL≥600kW±10±10±10VMINPowerConsumptionPdVO=0140140170mWMAXNOTESFor25∞CcharacterlsticsofOP37NTandOP37GTdevices,seeOP37NandOP37Gcharacteristics,respectively.
Electricaltestsareperformedatwaferprobetothelimitsshown.
Duetovariationsinassemblymethodsandnormalyieldloss,yieldafterpackagingisnotguaranteedforstandardproductdice.
Consultfactorytonegotiatespecificationsbasedondicelotqualificationthroughsamplelotassemblyandtesting.
(VS=15V,TA=25CforOP37N,OP37G,andOP37GRdevices;TA=125CforOP37NTandOP37GTdevices,unlessotherwisenoted.
)BINDINGDIAGRAM12346871427U19901.
NULL2.
(–)INPUT3.
(+)INPUT4.
V–6.
OUTPUT7.
V+8.
NULLREV.
BOP37–6–TypicalElectricalCharacteristicsOP37NTOP37NOP37GTOP37GOP37GRParameterSymbolConditionsTypicalTypicalTypicalTypicalTypicalUnitAverageInputOffsetVoltageDriftTCVOSorNulledorTCVOSNUnnulledRP=8kWto20kW0.
20.
20.
30.
30.
4mV/∞CAverageInputOffsetCurrentDriftTCIOS8080130130180pA/∞CAverageInputBiasCurrentDriftTCIB100100160160200pA/∞CInputNoiseVoltageDensityenfO=10Hz3.
53.
53.
53.
53.
8nV/÷HzfO=30Hz3.
13.
13.
13.
13.
3nV/÷HzfO=1000Hz3.
03.
03.
03.
03.
2nV/÷HzInputNoiseCurrentDensityinfO=10Hz1.
71.
71.
71.
71.
7pA/÷HzfO=30Hz1.
01.
01.
01.
01.
0pA/÷HzfO=1000Hz0.
40.
40.
40.
40.
4pA/÷HzInputNoiseVoltageenp-p0.
1Hzto10Hz0.
080.
080.
080.
080.
09mVp-pSlewRateSRRL≥2kW1717171717V/msGainBandwidthProductGBWfO=10kHz6363636363MHz(VS=15V,TA=25C,unlessotherwisenoted.
)REV.
B–7–OP37FREQUENCY–HzGAIN–dB1000.
0190807060500.
11101004030TESTTIMEOF10secMUSTBEUSEDTOLIMITLOWFREQUENCY(0.
1Hz)GAIN.
TPC1.
Noise-TesterFrequencyResponse(0.
1Hzto10Hz)BANDWIDTH–HzRMSVOLTAGENOISE–V10100k10.
10.
011001k10kTA=25CVS=15VTPC4.
InputWidebandVoltageNoisevs.
Bandwidth(0.
1HztoFrequencyIndicated)TOTALSUPPLYVOLTAGE(V+–V–)–VoltsVOLTAGENOISE–nV/Hz54101040203032TA=25CAT10HzAT1kHzTPC7.
VoltageNoiseDensityvs.
SupplyVoltageFREQUENCY–Hz101TA=25CVS=15V987654321101001kVOLTAGENOISE–nV/HzI/FCORNER=2.
7HzTPC2.
VoltageNoiseDensityvs.
FrequencySOURCERESISTANCE–100110k1001kTOTALNOISE–nV/Hz10TA=25CVS=15VR2R1RS–2R1AT1kHzAT10HzRESISTORNOISEONLYTPC5.
TotalNoisevs.
SourceResistanceFREQUENCY–HzCURRENTNOISE–pA/Hz10.
00.
11010k1.
01001kI/FCORNER=140HzTPC8.
CurrentNoiseDensityvs.
FrequencyFREQUENCY–Hz10011101001kVOLTAGENOISE–nV/Hz10LOWNOISEAUDIOOPAMPINSTRUMENTATIONRANGETODCAUDIORANGETO20kHzI/FCORNER741OP37I/FCORNERI/FCORNER=2.
7HzTPC3.
AComparisonofOpAmpVoltageNoiseSpectraTEMPERATURE–CVOLTAGENOISE–nV/Hz5–50–2502550751001254321AT10HzAT1kHzVS=15VTPC6.
VoltageNoiseDensityvs.
TemperatureTOTALSUPPLYVOLTAGE–VoltsSUPPLYCURRENT–mA5.
05TA=+125C4.
03.
02.
01.
015253545TA=+25CTA=–55CTPC9.
SupplyCurrentvs.
SupplyVoltageTypicalPerformanceCharacteristics–REV.
BOP37–8–TEMPERATURE–COFFSETVOLTAGE–V60–7540200–20–40–60–50–2502550751001251501755010–30–7030–10–50TRIMMINGWITH10kPOTDOESNOTCHANGETCVOSOP37COP37BOP37AOP37BOP37AOP37AOP37BOP37CTPC10.
OffsetVoltageDriftofEightRepresentativeUnitsvs.
TemperatureTIME–SecondsOPEN-LOOPGAIN–dB30–205002040608010025201510TA=25CTA=70CDEVICEIMMERSEDIN70COILBATHTHERMALSHOCKRESPONSEBANDVS=+15VTPC13.
OffsetVoltageChangeDuetoThermalShockFREQUENCY–HzOPEN-LOOPVOLTAGEGAIN–dB1401TA=25CVS=15VRL2k12010080604020010102103104105106107108TPC16.
Open-LoopGainvs.
FrequencyTIME–MONTHSCHANGEINOFFSETVOLTAGE–V602–2–640–2–6123456740–462–4TPC11.
Long-TermOffsetVoltageDriftofSixRepresentativeUnitsTEMPERATURE–CINPUTBIASCURRENT–nA–5040200–250255075100125150503010VS=+15VOP37AOP37BOP37CTPC14.
InputBiasCurrentvs.
TemperatureTEMPERATURE–CSLEWRATE–V/s–50703010–250255075100125806020VS=15VSLEWM6525755515PHASEMARGIN–DEG9085807570656055504540GAIN-BANDWIDTHPRODUCT–MHzF=10kHzGBWTPC17.
SlewRate,GainBandwidthProduct,PhaseMarginvs.
TemperatureTIMEAFTERPOWERON–MINUTESCHANGEININPUTOFFSETVOLTAGE–V101014235TA=25CVS=15V5OP37C/GOP37FOP37A/ETPC12.
WarmUpOffsetVoltageDriftTEMPERATURE–CINPUTOFFSETCURRENT–nA–75500–50–250255075100125VS=15V40302010OP37AOP37BOP37CTPC15.
InputOffsetCurrentvs.
TemperatureFREQUENCY–Hz60100k1M10M100MGAIN–dB50403020100–10TA=25CVS=15VAV=5–80–100–120–140–160–180–200–220PHASESHIFT–DegreesPHASEMARGIN=71TPC18.
Gain,PhaseShiftvs.
FrequencyREV.
B–9–OP37TOTALSUPPLYVOLTAGE–VoltsOPEN-LOOPGAIN–V/V2.
5010402030TA=25C502.
01.
51.
00.
50RL=2kRL=1kTPC19.
Open-LoopVoltageGainvs.
SupplyVoltageCAPACITIVELOAD–pFPERCENTOVERSHOOT8060005002000100015004020VS=15VVIN=20mVAV=+5(1k,250)TPC22.
Small-SignalOvershootvs.
CapacitiveLoadTIMEFROMOUTPUTSHORTEDTOGROUND–MINUTESSHORT-CIRCUITCURRENT–mA600142355040302010TA=25CVS=15VISC(+)ISC(–)TPC25.
Short-CircuitCurrentvs.
TimeFREQUENCY–Hz28104105106107PEAK-TO-PEAKAMPLITUDE–Volts24201612840TA=25CVS=15VTPC20.
MaximumOutputSwingvs.
Frequency5V1s+10V0V–10VTA=25CVS=15VAV=+5(1k,250)TPC23.
Large-SignalTransientResponseFREQUENCY–HzCMRR–dB1401k12010080604010k100k1M10MVS=15VTA=25CVCM=10VTPC26.
CMRRvs.
FrequencyLOADRESISTANCE–MAXIMUMOUTPUT–Volts181001k10k1614121086420–2TA=25CVS=15VPOSITIVESWINGNEGATIVESWINGTPC21.
MaximumOutputVoltagevs.
LoadResistance20mV200ns+50mV0V–50mVTA=25CVS=15VAV=+5(1k,250)TPC24.
Small-SignalTransientResponseSUPPLYVOLTAGE–VoltsCOMMON-MODERANGE–Volts160512840–4101520–8–12–16TA=–55CTA=+125CTA=+25CTA=+25CTA=–55CTA=+125CTPC27.
Common-ModeInputRangevs.
SupplyVoltageREV.
BOP37–10–OP12OP37D.
U.
T.
100k4.
3k4.
7F2k24.
3kVOLTAGEGAIN=50,0002.
2F22F110kSCOPE1RIN=1M0.
1F10100k0.
1FTPC28.
NoiseTestCircuit(0.
1Hzto10Hz)FREQUENCY–HzPOWERSUPPLYREJECTIONRATIO–dB1401TA=25C120100806040200101001k10k100k1M10M100M160POSITIVESWINGNEGATIVESWINGTPC31.
PSRRvs.
Frequency1SEC/DIVTPC29.
Low-FrequencyNoiseLOADRESISTANCE–191001k10k100kSLEWRATE–V/VTA=25CVS=15VAV=5VO=20Vp-p18171615TPC32.
SlewRatevs.
LoadLOADRESISTANCE–2.
41001k10k100kOPEN-LOOPVOLTAGEGAIN–V/VTA=25CVS=15V2.
22.
01.
81.
61.
41.
21.
00.
80.
60.
4TPC30.
Open-LoopVoltageGainvs.
LoadResistanceSUPPLYVOLTAGE–VoltsVOLTAGENOISE–V/s203151050TA=25CAVCL=56912151821FALLRISETPC33.
SlewRatevs.
SupplyVoltageREV.
BOP37–11–APPLICATIONSINFORMATIONOP37Seriesunitsmaybeinserteddirectlyinto725andOP07socketswithorwithoutremovalofexternalcompensationornullingcomponents.
Additionally,theOP37maybefittedtounnulled741typesockets;however,ifconventional741nullingcircuitryisinuse,itshouldbemodifiedorremovedtoensurecorrectOP37operation.
OP37offsetvoltagemaybenulledtozero(orotherdesiredsetting)usingapotentiometer(seefigure1).
TheOP37providesstableoperationwithloadcapacitancesofupto1000pFand±10Vswings;largercapacitancesshouldbedecoupledwitha50Wresistorinsidethefeedbackloop.
Closedloopgainmustbeatleastfive.
Forclosedloopgainbetweenfivetoten,thedesignershouldconsiderboththeOP27andtheOP37.
Forgainsaboveten,theOP37hasaclearadvantageovertheunitystableOP27.
Thermoelectricvoltagesgeneratedbydissimilarmetalsattheinputterminalcontactscandegradethedriftperformance.
Bestoperationwillbeobtainedwhenbothinputcontactsaremain-tainedatthesametemperature.
10kRPOP37V+OUTPUTV–+–Figure1.
OffsetNullingCircuitOffsetVoltageAdjustmentTheinputoffsetvoltageoftheOP37istrimmedatwaferlevel.
However,iffurtheradjustmentofVOSisnecessary,a10kWtrimpotentiometermaybeused.
TCVOSisnotdegraded(seeoffsetnullingcircuit).
Otherpotentiometervaluesfrom1kWto1MWcanbeusedwithaslightdegradation(0.
1mV/∞Cto0.
2mV/∞C)ofTCVOS.
Trimmingtoavalueotherthanzerocreatesadriftofapproximately(VOS/300)mV/∞C.
Forexample,thechangeinTCVOSwillbe0.
33mV/∞CifVOSisadjustedto100mV.
Theoffsetvoltageadjustmentrangewitha10kWpotentiometeris±4mV.
Ifsmalleradjustmentrangeisrequired,thenullingsensitivitycanbereducedbyusingasmallerpotinconjunctionwithfixedresistors.
Forexample,thenetworkshowninfigure2willhavea±280mVad-justmentrange.
184.
7k4.
7k1kPOTV+Figure2.
OffsetVoltageAdjustmentOP37–18V+18VFigure3.
Burn-InCircuitNoiseMeasurementsTomeasurethe80nVpeak-to-peaknoisespecificationoftheOP37inthe0.
1Hzto10Hzrange,thefollowingprecautionsmustbeobserved:∑Thedevicehastobewarmed-upforatleastfiveminutes.
Asshowninthewarm-updriftcurve,theoffsetvoltagetypicallychanges4mVduetoincreasingchiptemperatureafterpowerup.
Inthetensecondmeasurementinterval,thesetemperature-inducedeffectscanexceedtensofnanovolts.
∑Forsimilarreasons,thedevicehastobewell-shieldedfromaircurrents.
Shieldingminimizesthermocoupleeffects.
∑Suddenmotioninthevicinityofthedevicecanalso"feedthrough"toincreasetheobservednoise.
∑Thetesttimetomeasure0.
1Hztol0Hznoiseshouldnotexceed10seconds.
Asshowninthenoise-testerfrequencyresponsecurve,the0.
1Hzcornerisdefinedbyonlyonezero.
Thetesttimeoftensecondsactsasanadditionalzerotoeliminatenoisecontributionsfromthefrequencybandbelow0.
1Hz.
∑Anoise-voltage-densitytestisrecommendedwhenmeasuringnoiseonalargenumberofunits.
A10Hznoise-voltage-densitymeasurementwillcorrelatewellwitha0.
1Hz-to-10Hzpeak-to-peaknoisereading,sincebothresultsaredeterminedbythewhitenoiseandthelocationofthe1/fcornerfrequency.
OptimizingLinearityBestlinearitywillbeobtainedbydesigningfortheminimumoutputcurrentrequiredfortheapplication.
Highgainandexcellentlinearitycanbeachievedbyoperatingtheopampwithapeakoutputcurrentoflessthan±10mA.
InstrumentationAmplifierAthree-op-ampinstrumentationamplifier,showninfigure4,provideshighgainandwidebandwidth.
Theinputnoiseofthecircuitbelowis4.
9nV/÷Hz.
Thegainoftheinputstageissetat25andthegainofthesecondstageis40;overallgainis1000.
Theamplifierbandwidthof800kHzisextraordinarilygoodforaprecisioninstrumentationamplifier.
Settoagainof1000,thisyieldsagainbandwidthproductof800MHz.
Thefull-powerbandwidthfora20Vp-poutputis250kHz.
PotentiometerR7providesquadraturetrimmingtooptimizetheinstrumentationamplifier'saccommon-moderejection.
R7100kC1100pFR15k0.
1%R3390R2100R45k0.
1%INPUT(+)INPUT(–)R55000.
1%R65000.
1%R820k0.
1%R919.
8kR10500VOUTNOTES:TRIMR2FORAVCL=1000TRIMR10FORdcCMRRTRIMR7FORMINIMUMVOUTATVCM=20Vp-p,10kHz+–OP37+–OP37+–OP37Figure4a.
InstrumentationAmplifierREV.
BOP37–12–FREQUENCY–Hz14010CMRR–dB1001k10k100k1M120100806040TA=25CVS=15VVCM=20Vp-pACTRIM@10kHzRS=0RS=100,1kUNBALANCEDRS=1kBALANCEDRS=0Figure4b.
CMRRvs.
FrequencyCommentsonNoiseTheOP37isaverylow-noisemonolithicopamp.
TheoutstandinginputvoltagenoisecharacteristicsoftheOP37areachievedmainlybyoperatingtheinputstageatahighquiescentcurrent.
Theinputbiasandoffsetcurrents,whichwouldnormallyincrease,areheldtoreasonablevaluesbytheinputbiascurrentcancellationcircuit.
TheOP37A/EhasIBandIOSofonly±40nAand35nArespectivelyat25∞C.
Thisisparticularlyimportantwhentheinputhasahighsourceresistance.
Inaddition,manyaudioamplifierdesignersprefertousedirectcoupling.
ThehighIB.
TCVOSofpreviousdesignshavemadedirectcouplingdifficult,ifnotimpossible,touse.
RS–SOURCERESISTANCE–105010kTOTALNOISE–nV/Hz55001k5k11005010050kRS1RS21RSUNMATCHEDe.
g.
RS=RS1=10k,RS2=02RSMATCHEDe.
g.
RS=10k,RS1=RS2=5kOP075534OP27/37REGISTERNOISEONLYOP08/10812Figure5.
Noisevs.
Resistance(IncludingResistorNoise@1000Hz)Voltagenoiseisinverselyproportionaltothesquare-rootofbiascurrent,butcurrentnoiseisproportionaltothesquare-rootofbiascurrent.
TheOP37'snoiseadvantagedisappearswhenhighsource-resistorsareused.
Figures5,6,and7compareOP-37observedtotalnoisewiththenoiseperformanceofotherdevicesindifferentcircuitapplications.
Totalnoise=[(Voltagenoise)2+(currentnoiseRS)2+(resistornoise_]1/2Figure5showsnoiseversussourceresistanceat1000Hz.
Thesameplotappliestowidebandnoise.
Tousethisplot,justmultiplytheverticalscalebythesquare-rootofthebandwidth.
RS–SOURCERESISTANCE–1005010kp-pNOISE–nV505001k5k101k50010050kRS1RS21RSUNMATCHEDe.
g.
RS=RS1=10k,RS2=02RSMATCHEDe.
g.
RS=10k,RS1=RS2=5kOP075534OP27/37REGISTERNOISEONLYOP08/10812Figure6.
Peak-to-PeakNoise(0.
1Hzto10Hz)vs.
SourceResistance(IncludesResistorNoise)AtRS0kWthatcurrentnoisestartstodominate.
Theargumentcanbemadethatcurrentnoiseisnotimportantforapplicationswithlowto-moderatesourceresistances.
ThecrossoverbetweentheOP37andOP07andOP08noiseoccursinthe15kWto40kWregion.
RS–SOURCERESISTANCE–105010kTOTALNOISE–nV/Hz55001k5k11005010050kOP075534OP27/37REGISTERNOISEONLYOP08/108RS1RS21RSUNMATCHEDe.
g.
RS=RS1=10k,RS2=02RSMATCHEDe.
g.
RS=10k,RS1=RS2=5k12Figure7.
Noisevs.
Sourceresistance(IncludesResistorNoise@10Hz)Figure6showsthe0.
1Hzto10Hzpeak-to-peaknoise.
Herethepictureislessfavorable;resistornoiseisnegligible,currentnoisebecomesimportantbecauseitisinverselyproportionaltothesquare-rootoffrequency.
ThecrossoverwiththeOP07occursinthe3kWto5kWrangedependingonwhetherbal-ancedorunbalancedsourceresistorsareused(at3kWtheIB.
IOSerroralsocanbethreetimestheVOSspec.
).
Therefore,forlow-frequencyapplications,theOP07isbetterthantheOP27/37whenRs>3kW.
Theonlyexceptioniswhengainerrorisimportant.
Figure7illustratesthe10Hznoise.
Asexpected,theresultsarebetweentheprevioustwofigures.
Forreference,typicalsourceresistancesofsomesignalsourcesarelistedinTableI.
REV.
BOP37–13–TableI.
SourceDeviceImpedanceCommentsStralnGauge00WTypicallyusedinlow-frequencyapplications.
Magnetic00WLowIBveryimportanttoreduceTapeheadset-magnetizationproblemswhendirectcouplingisused.
OP37IBcanbeneglected.
Magnetic00WSimilarneedforlowIBindirectPhonographcoupledapplications.
OP37willnotCartridgesintroduceanyself-magnetizationproblem.
LinearVariable00WUsedinruggedservo-feedbackDifferentialapplications.
BandwidthofinterestTransformeris400Hzto5kHz.
AudioApplicationsThefollowingapplicationsinformationhasbeenabstractedfromaPMIarticleinthe12/20/80issueofElectronicDesignmagazineandupdated.
Ca150pFA1OP27Ra47.
5kR197.
6kMOVINGMAGNETCARTRIDGEINPUTR27.
87kR3100C10.
03FC20.
01FC30.
47FR475k++C4(2)220FLFROLLOFFOUTINOUTPUTR5100kG=1kHzGAIN=0.
101()R1R31+=98.
677(39.
9dB)ASSHOWNFigure8.
PhonoPre-AmplifierCircuitFigure8isanexampleofaphonopre-amplifiercircuitusingtheOP27forA1;R1-R2-C1-C2formaveryaccurateRIAAnet-workwithstandardcomponentvalues.
ThepopularmethodtoaccomplishRIAAphonoequalizationistoemployfrequency-dependentfeedbackaroundahigh-qualitygainblock.
Properlychosen,anRCnetworkcanprovidethethreenecessarytimeconstantsof3180ms,318ms,and75ms.
1Forinitialequalizationaccuracyandstability,precisionmetal-filmresistorsandfilmcapacitorsofpolystyreneorpolypropylenearerecommendedsincetheyhavelowvoltagecoefficients,dissipationfactors,anddielectricabsorption.
4(High-Kceramiccapacitorsshouldbeavoidedhere,thoughlow-Kceramics—suchasNPOtypes,whichhaveexcellentdissipationfactors,andsomewhatlowerdielectricabsorption—canbeconsideredforsmallvaluesorwherespaceisatapremium.
)TheOP37bringsa3.
2nV/÷Hzvoltagenoiseand0.
45pA/÷Hzcurrentnoisetothiscircuit.
Tominimizenoisefromothersources,R3issettoavalueof100W,whichgeneratesavoltagenoiseof1.
3nV/÷Hz.
Thenoiseincreasesthe3.
2nV/÷Hzoftheamplifierbyonly0.
7dB.
Witha1kWsource,thecircuitnoisemeasures63dBbelowa1mVreferencelevel,unweighted,ina20kHznoisebandwidth.
Gain(G)ofthecircuitat1kHzcanbecalculatedbytheexpression:GRR=+0101113.
Forthevaluesshown,thegainisjustunder100(or40dB).
LowergainscanbeaccommodatedbyincreasingR3,butgainshigherthan40dBwillshowmoreequalizationerrorsbecauseofthe8MHzgainbandwidthoftheOP27.
Thiscircuitiscapableofverylowdistortionoveritsentirerange,generallybelow0.
01%atlevelsupto7Vrms.
At3Voutputlevels,itwillproducelessthan0.
03%totalharmonicdistortionatfrequenciesupto20kHz.
CapacitorC3andresistorR4formasimple–6dBperoctaverumblefilter,withacornerat22Hz.
Asanoption,theswitchselectedshuntcapacitorC4,anonpolarizedelectrolytic,bypassesthelow-frequencyrolloff.
Placingtherumblefilter'shigh-passactionafterthepreamphasthedesirableresultofdiscriminatingagainsttheRIAAamplifiedlowfrequencynoisecomponentsandpickup-producedlow-frequencydisturbances.
ApreamplifierforNABtapeplaybackissimilartoanRIAAphonopreamp,thoughmoregainistypicallydemanded,alongwithequalizationrequiringaheavylow-frequencyboost.
ThecircuitInFigure8canbereadilymodifiedfortapeuse,asshownbyFigure9.
CaRaR133kTAPEHEAD0.
47F0.
01FR25k100k15kT1=3180sT2=50sOP37+–Figure9.
Tape-HeadPreamplifierWhilethetape-equalizationrequirementhasaflathighfrequencygainabove3kHz(t2=50ms),theamplifierneednotbestabilizedforunitygain.
ThedecompensatedOP37providesagreaterbandwidthandslewrate.
Formanyapplications,theidealizedtimeconstantsshownmayrequiretrimmingofRaandR2tooptimizefrequencyresponsefornonidealtapeheadperfor-manceandotherfactors.
5Thenetworkvaluesoftheconfigurationyielda50dBgainat1kHz,andthedcgainisgreaterthan70dB.
Thus,theworst-caseout-putoffsetisjustover500mV.
Asingle0.
47mFoutputcapacitorcanblockthislevelwithoutaffectingthedynamicrange.
Thetapeheadcanbecoupleddirectlytotheamplifierinput,sincetheworst-casebiascurrentof85nAwitha400mH,100min.
head(suchasthePRB2H7K)willnotbetroublesome.
Onepotentialtape-headproblemispresentedbyamplifierbias-currenttransientswhichcanmagnetizeahead.
TheOP27andREV.
BOP37–14–OP37arefreeofbias-currenttransientsuponpoweruporpowerdown.
However,itisalwaysadvantageoustocontrolthespeedofpowersupplyriseandfall,toeliminatetransients.
Inaddition,thedcresistanceoftheheadshouldbecarefullycontrolled,andpreferablybelow1kW.
Forthisconfiguration,thebias-currentinducedoffsetvoltagecanbegreaterthanthe170pVmaximumoffsetiftheheadresistanceisnotsufficientlycontrolled.
Asimple,buteffective,fixed-gaintransformerlessmicrophonepreamp(Figure10)amplifiesdifferentialsignalsfromlowimped-ancemicrophonesby50dB,andhasaninputimpedanceof2kW.
Becauseofthehighworkinggainofthecircuit,anOP37helpstopreservebandwidth,whichwillbe110kHz.
AstheOP37isadecompensateddevice(minimumstablegainof5),adummyresistor,RP,maybenecessary,ifthemicrophoneistobeunplugged.
Otherwisethe100%feedbackfromtheopeninputmaycausetheamplifiertooscillate.
OP37+–R3316kRp30kR11kR4316kR21kR710kR6100OUTPUTR3R1R4R2=LOWIMPEDANCEMICROPHONEINPUT(Z=50TO200)C15FFigure10.
FixedGainTransformerlessMicrophonePreampCommon-modeinput-noiserejectionwilldependuponthematchofthebridge-resistorratios.
Eitherclose-tolerance(0.
1%)typesshouldbeused,orR4shouldbetrimmedforbestCMRR.
Allresistorsshouldbemetal-filmtypesforbeststabilityandlownoise.
NoiseperformanceofthiscircuitislimitedmorebytheinputresistorsR1andR2thanbytheopamp,asR1andR2eachgeneratea4nV/÷Hznoise,whiletheopampgeneratesa3.
2nV/÷Hznoise.
Thermssumofthesepredominantnoisesourceswillbeabout6nV/÷Hz,equivalentto0.
9mVina20kHznoiseband-width,ornearly61dBbelowalmVinputsignal.
Measurementsconfirmthispredictedperformance.
Forapplicationsdemandingappreciablylowernoise,ahighqualitymicrophone-transformer-coupledpreamp(Figure11)incorporatestheinternallycompensated.
T1isaJE-115K-E150W/15kWtransformerwhichprovidesanoptimumsourceresistancefortheOP27device.
Thecircuithasanoverallgainof40dB,theproductofthetransformer'svoltagesetupandtheopamp'svoltagegain.
Gainmaybetrimmedtootherlevels,ifdesired,byadjustingR2orR1.
BecauseofthelowoffsetvoltageoftheOP27,theoutputoffsetofthiscircuitwillbeverylow,1.
7mVorless,fora40dBgain.
Thetypicaloutputblockingcapacitorcanbeeliminatedinsuchcases,butisdesirableforhighergainstoeliminateswitchingtransients.
A1OP27R3100R1121R21100C21800pFOUTPUT150SOURCET1*T1–JENSENJE–115K–EJENSENTRANSFORMERS10735BURBANKBLVD.
N.
HOLLYWOOD,CA91601*Figure11.
MicrophoneTransformerCoupledPreampCapacitorC2andresistorR2forma2mstimeconstantinthiscircuit,asrecommendedforoptimumtransientresponsebythetransformermanufacturer.
WithC2inuse,A1musthaveunity-gainstability.
Forsituationswherethe2mstimecon-stantisnotnecessary,C2canbedeleted,allowingthefasterOP37tobeemployed.
Somecommentonnoiseisappropriatetounderstandthecapabilityofthiscircuit.
A150WresistorandR1andR2gainresistorsconnectedtoanoiselessamplifierwillgenerate220nVofnoiseina20kHzbandwidth,or73dBbelowa1mVreferencelevel.
Anypracticalamplifiercanonlyapproachthisnoiselevel;itcanneverexceedit.
WiththeOP27andT1specified,theadditionalnoisedegradationwillbecloseto3.
6dB(or–69.
5referencedto1mV).
References1.
Lipshitz,S.
P,"OnRIAAEqualizationNetworks,"JAES,Vol.
27,June1979,p.
458-4S1.
2.
Jung,W.
G.
,ICOpAmpCookbook,2ndEd.
,H.
W.
SamsandCompany,1980.
3.
Jung,W.
G.
,Audio/COpAmpApplications,2ndEd.
,H.
W.
SamsandCom-pany,1978.
4.
Jung,W.
G.
,andMarsh,R.
M.
,"PickingCapacitors.
"Audio,February&March,1980.
5.
Otala,M.
,"Feedback-GeneratedPhaseNonlinearityinAudioAmplifiers,"LondonAESConvention,March1980,preprint197B.
6.
Stout,D.
F.
,andKaufman,M.
,HandbookofOperationalAmplifierCircuitDesign,NewYork,McGrawHill,1976.
REV.
BOP37–15–OUTLINEDIMENSIONS8-LeadCeramicDIP–GlassHermeticSeal[CERDIP](Q-8)Dimensionsshownininchesand(millimeters)14850.
310(7.
87)0.
220(5.
59)PIN10.
005(0.
13)MIN0.
055(1.
40)MAX0.
100(2.
54)BSC1500.
320(8.
13)0.
290(7.
37)0.
015(0.
38)0.
008(0.
20)SEATINGPLANE0.
200(5.
08)MAX0.
405(10.
29)MAX0.
150(3.
81)MIN0.
200(5.
08)0.
125(3.
18)0.
023(0.
58)0.
014(0.
36)0.
070(1.
78)0.
030(0.
76)0.
060(1.
52)0.
015(0.
38)CONTROLLINGDIMENSIONSAREININCHES;MILLIMETERSDIMENSIONS(INPARENTHESES)AREROUNDED-OFFINCHEQUIVALENTSFORREFERENCEONLYANDARENOTAPPROPRIATEFORUSEINDESIGN8-LeadPlasticDual-in-LinePackage[PDIP](N-8)Dimensionsshownininchesand(millimeters)SEATINGPLANE0.
015(0.
38)MIN0.
180(4.
57)MAX0.
150(3.
81)0.
130(3.
30)0.
110(2.
79)0.
060(1.
52)0.
050(1.
27)0.
045(1.
14)81450.
295(7.
49)0.
285(7.
24)0.
275(6.
98)0.
100(2.
54)BSC0.
375(9.
53)0.
365(9.
27)0.
355(9.
02)0.
150(3.
81)0.
135(3.
43)0.
120(3.
05)0.
015(0.
38)0.
010(0.
25)0.
008(0.
20)0.
325(8.
26)0.
310(7.
87)0.
300(7.
62)0.
022(0.
56)0.
018(0.
46)0.
014(0.
36)CONTROLLINGDIMENSIONSAREININCHES;MILLIMETERDIMENSIONS(INPARENTHESES)AREROUNDED-OFFINCHEQUIVALENTSFORREFERENCEONLYANDARENOTAPPROPRIATEFORUSEINDESIGNCOMPLIANTTOJEDECSTANDARDSMO-095AA8-LeadStandardSmallOutlinePackage[SOIC]NarrowBody(RN-8)Dimensionsshowninmillimetersand(inches)0.
25(0.
0098)0.
19(0.
0075)1.
27(0.
0500)0.
41(0.
0160)0.
50(0.
0196)0.
25(0.
0099)45801.
75(0.
0688)1.
35(0.
0532)SEATINGPLANE0.
25(0.
0098)0.
10(0.
0040)85415.
00(0.
1968)4.
80(0.
1890)4.
00(0.
1574)3.
80(0.
1497)1.
27(0.
0500)BSC6.
20(0.
2440)5.
80(0.
2284)0.
51(0.
0201)0.
33(0.
0130)COPLANARITY0.
10CONTROLLINGDIMENSIONSAREINMILLIMETERS;INCHDIMENSIONS(INPARENTHESES)AREROUNDED-OFFMILLIMETEREQUIVALENTSFORREFERENCEONLYANDARENOTAPPROPRIATEFORUSEINDESIGNCOMPLIANTTOJEDECSTANDARDSMS-012AAREV.
B–16–C00319–0–12/02(B)PRINTEDINU.
S.
A.
RevisionHistoryLocationPage12/02–DataSheetchangedfromREV.
AtoREV.
B.
EditstoBINDINGDIAGRAM5EditstoCaptionforTPC3110EditstoAPPLICATIONSINFORMATIONSection11AddedCaptiontoFigure211AddedCaptiontoFigures4aand4b11AddedCaptiontoFigures8–1113UpdatedOUTLINEDIMENSIONS152/02–DataSheetchangedfromREV.
0toREV.
A.
EditstoFEATURES1EditstoORDERINGINFORMATION1EditstoPINCONNECTIONS1EditstoABSOLUTEMAXIMUMRATINGS2EditstoPACKAGETYPE2EditstoELECTRICALCHARACTERISTICS3EditstoAPPLICATIONSINFORMATION8OP37