OPA2277-EP High Precision Operational Amplifier - …

1 R1V 1/2 OPA2277R21/2 opa2277 VOUT= (V1 V2)(1 + )R2R1V+V+V R2R1 LoadCellR+ RV2R RR RR+ RV1 ProductFolderSample &BuyTechnicalDocumentsTools &SoftwareSupport &CommunityOPA2277-EPSBOS700 DECEMBER2014 opa2277 -EPHigh- Precision ,Low-NoiseOperat ionalAmplifier1 Features3 DescriptionTheOPA2277precisionoperationa lamplifier1 Ultra-LowOffsetVoltage:10 Vreplacesthe offers HighOpen-LoopGain:134 dBimprovednoise,wideroutputvoltageswing, and is HighCommon-ModeRejection:140 dBtwiceas fast with half the ,low bias HighPowerSupplyRejection:130 dBcurrent,highcommon-moderejection,andhi gh Low BiasCurrent:1-nAMaximumpowersupplyreject ion. WideSupplyRange: 2 to 18 VOPA2277operatesfrom 2-V to 18-Vsupplieswith Low QuiescentCurrent:800 SupportsDefense,Aerospace,and Medicalamplifiers,whichare specifiedat onlyonesupplyApplicationsvoltage,the OPA2277is specifiedfor real-worldapplications;a singlelimitappliesoverthe 5-V to ControlledBaseline maintained One Assemblyand TestSiteas theamplifiersswingto theirspecifiedlimit.

2 One FabricationSiteBecausethe initialoffsetvoltage( 20 V max)is solow, useradjustmentis usuallynot required. Availablein Military( 55 C to 125 C)TemperatureRange(1)OPA2277is easyto useandfreefromphase ExtendedProductLife Cycleinversionandoverloadproblemsfoundin is stablein unitygainand ExtendedProduct-ChangeNotificationprovid esexcellentdynamicbehaviorovera wide ProductTraceabilityrangeof lowestcrosstalk2 Applicationsand freedomfrominteraction,evenwhenoverdrive nor availablein DIP-8, fully specifiedand operatesfrom BridgeAmplifier 55 C to 125 C. TemperatureMeasurementsDeviceInformation (1) StrainGageAmplifierORDERNUMBERPACKAGEBOD YSIZE(NOM) PrecisionIntegratorOPA2277 MDTEPSOIC(8) Battery-PoweredInstruments(1) For all availablepackages,see the orderableaddendumat TestEquipmentthe end of the datasheet.(1)Additionaltemperatureranges available contactfactory4 LoadCell AmplifierSchematic1An IMPORTANTNOTICEat the end of this datasheetaddressesavailability,warranty, changes,use in safety-criticalapplications,intellectual propertymattersand Applicationand LoadCell Pin Configurationand Deviceand Mechanical,Packaging,and Orderable8 RevisionHistoryDATEREVISIONNOTESD ecember2014* 2014,TexasInstrumentsIncorporated1234876 5V+Out B In B+In BOut A In A+In AV DECEMBER20146 Pin Configurationand FunctionsD Package8 Pins(TopView)

3 Pin IN A2 IInvertingamplifierinputA+IN A3 INon-invertingamplifierinputAV 4 INegativeamplifierpowersupplyinput+IN B5 INon-invertingamplifierinputB IN B6 IInvertingamplifierinputBOUTB7 OAmplifieroutputBV+8 IPositiveamplifierpowersupplyinputCopyri ght 2014,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback3 opa2277 -EPSBOS700 (1)overoperatingfree-airtemperature(unle ssotherwisenoted)MINMAXUNITS upplyvoltage36 VInputvoltage(V ) (V+) + (to ground)(2)ContinuousOperatingtemperature 55125 CJunctiontemperature150 CLeadtemperature(soldering,10 s)300 CTstgStoragetemperaturerange 55125 C(1)Stressesbeyondthoselistedunderabsolu temaximumratingsmay causepermanentdamageto the stressratingsonly,and functionaloperationof the deviceat theseor any otherconditionsbeyondthoseindicatedunder recommendedoperatingconditionsis not absolute-maximum-ratedconditionsfor extendedperiodsmay affectdevicereliability.

4 (2)One channelper (HBM),per ANSI/ESDA/JEDECJS-001,all pins(1) 2000 ElectrostaticV(ESD)VdischargeMachinemode l(MM) 100(1)JEDEC documentJEP155statesthat 500-VHBM allowssafe manufacturingwith a (unlessotherwisenoted)MINNOMMAXUNITVSS pecifiedvoltagerange 5 15 VOperatingvoltagerange 2 18 VTJO peratingjunctiontemperature 55125 (1)DUNIT8 PINSR JC(top)Junction-to-case(top) C/W JC(bot)Junction-to-case(bottom)thermalre sistanceN/A(1)For moreinformationabouttraditionaland new thermalmetrics,see theICPackageThermalMetricsapplicationrep ort, 2014, TA= 25 C, VS= 5 V to 15 V, RL= 2 k (unlessotherwisenoted).PARAMETERTESTCOND ITIONSMINTYPMAXUNITOFFSETVOLTAGEVOSI nputoffsetvoltage 20 65 Vvs temperature,TJ= 55 C to 125 C 150 Vvs temperature(dVOS/dT),TJ= 55 C to V/ C125 Cvs powersupply(PSRR)VS= 2 V to 18 V 1 V/VTJ= 55 C to 125 CVS= 2 V to 18 V 1vs V/moChannelseparation(dual) V/VINPUTBIASCURRENTI nputbias current 55 C to 125 C 7 Inputoffsetcurrent 55 C to 125 C VppInputvoltagenoise, = to 10 Vrms = 10 Hz12 = 1008 HzenInputvoltagenoisedensitynV/ Hz = 1 Hz8 = 10 Hz8inCurrentnoisedensity = 1 HzINPUTVOLTAGERANGEVCMC ommon-modevoltagerange(V ) + 2(V+) 2 VVCM= (V ) + 2 V to (V+) 2 V115140dBCommon-moderejectionCMRRTJ= 55 C to 125 CVCM= (V ) + 2 V to (V+) 2 V115dBINPUTIMPEDANCED ifferential100 || 3M || pFCommon-modeVCM= (V ) + 2 V to (V+) 2 V250 || 3G || pFOPEN-LOOPGAINVO= (V ) + V to (V+)

5 V,140RL= 10 k Open-loopvoltagegainVO= (V ) + V to (V+) V,AOL126134dBTJ= 55 C to 125 CRL= 2 k VO= (V ) + V to (V+) V,126RL= 2 15 V, G = 1, 10-Vstep14 15 V, G = 1, 10-Vstep16 sOverloadrecoverytimeVINx G = VS3 sTotalharmonicdistortion+ noise = 1 kHz,G = 1, VO= (THD+ N)Copyright 2014,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback5 opa2277 -EPSBOS700 (continued)At TA= 25 C, VS= 5 V to 15 V, RL= 2 k (unlessotherwisenoted).PARAMETERTESTCOND ITIONSMINTYPMAXUNITOUTPUTRL= 10 k (V ) + (V+) 10 k , TJ= 55 C to 125 C(V ) + (V+) 2 k (V ) + (V+) 2 k , TJ= 55 C to 125 C(V ) + (V+) 35mACLOADC apacitiveload driveSeeTypicalCharacteristicsPOWERSUPPL YVSS pecifiedvoltagerange 5 15 VOperatingvoltagerange 2 18 VIO= 0 A 790 825 AQuiescentcurrent(per Amplifier )IQTJ= 55 C to 125 CIO= 0 A 900 ATEMPERATURERANGES pecifiedtemperaturerange 55125 COperatingtemperaturerange 55125 CTstgStoragetemperaturerange 55125 C6 SubmitDocumentationFeedbackCopyright 2014, +Noise (%)Frequency (Hz)G = 10, RL= 2k , 10k G = 1, RL= 2k , 10k 101001k10k100kFrequency (Hz)1M140120100806040 Channel Separation (dB)Dual and quad devices.

6 G = 1,all channels. Quad measuredchannel A to D or B to C othercombinations yield similar orimproved Noise (nV/ Hz) Current Noise (fA/ Hz) Frequency (Hz)Current NoiseVoltage Noise1s/div50nV/divNoise signal is bandwidth limited tolie between and 20 AOL(dB)0 30 60 90 120 150 180 Phase ( )Frequency (Hz)G CL= 0CL= , CMR (dB)Frequency (Hz)+PSRCMR TA= 25 C, VS= 15 V, and RL= 2 k , PowerSupplyand Common-ModeRejectionvsFigure1. Open-LoopGain/Phasevs FrequencyFrequencyFigure4. InputNoiseVoltagevs TimeFigure3. InputNoiseand CurrentNoiseSpectralDensityvsFrequencyVO UT= VrmsFigure5. ChannelSeparationvs FrequencyFigure6. TotalHarmonicDistortion+ Noisevs FrequencyCopyright 2014,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback7 75 50 2502550751001251000950900850800750700650 600550500 Quiescent Current ( A)1009080706050403020100 Short-Circuit Current (mA)Temperature ( C)+ISC ISC IQ125 Temperature ( C) 75 50 250255075100543210 1 2 3 4 5 Input Bias Current (nA)Curves represent typicalproduction 1 2 3 Offset Voltage Change ( V)0306090120 Time from Power Supply Turn-On (s)154575105 75 50 250255075100125160150140130120110100 AOL, CMR, PSR (dB)Temperature ( C)CMRAOLPSRP ercent of Amplifiers (%)Offset Voltage ( V/ C) distributionof packaged , dual, andquad of Amplifiers (%)Offset Voltage ( V) 50 45 40 35 30 25 20 15 10 5 0 5 10 15 20 25 30 35 40 45 501614121086420 Typical distributionof packaged , dual, andquad (continued)

7 At TA= 25 C, VS= 15 V, and RL= 2 k , OffsetVoltageProductionDistributionFigur e8. OffsetVoltageDriftProductionDistribution Figure9. Warm-UpOffsetVoltageDriftFigure10. AOL, CMR,PSRvs TemperatureFigure11. InputBiasCurrentvs TemperatureFigure12. QuiescentCurrentand Short-CircuitCurrentvsTemperature8 SubmitDocumentationFeedbackCopyright 2014,TexasInstrumentsIncorporated1k10010 10k100kLoad Capacitance (pF)6050403020100 Overshoot (%)Gain = 1 Gain = +1 Gain = 1010 s/div2V/div(V+)(V+) 1(V+) 2(V+) 3(V+) 4(V+) 5(V ) + 5(V ) + 4(V ) + 3(V ) + 2(V ) + 1(V )0 5 10 15 20 25 30 Output Current (mA)Output Voltage Swing (V) 55 C 55 C125 C25 C125 C25 C1 MFrequency (Hz)1k10k100k302520151050 Output Voltage (VPP)VS= 15 VVS= 5V1000900800700600500 Quiescent Current ( A)0 5 10 15 20 Supply Voltage (V)per amplifier100102050 Settling Time ( s) 1 10 100 Gain (V/V) DECEMBER2014 TypicalCharacteristics(continued)At TA= 25 C, VS= 15 V, and RL= 2 k , 1500pFFigure13.

8 QuiescentCurrentvs SupplyVoltageFigure14. SettlingTimevs Closed-LoopGainFigure15. MaximumOutputVoltagevs FrequencyFigure16. OutputVoltageSwingvs OutputCurrentG = 1CL= 1500pFVS= 15 VFigure18. Large-SignalStepResponseFigure17. Small-SignalOvershootvs LoadCapacitanceCopyright 2014,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback91 s/div20mV/div1 s/div20mV/divOPA2277-EPSBOS700 (continued)At TA= 25 C, VS= 15 V, and RL= 2 k , = 1CL= 0 pFVS= 15 VG = 1CL= 1500pFVS= 15 VFigure19. Small-SignalStepResponseFigure20. Small-SignalStepResponse10 SubmitDocumentationFeedbackCopyright 2014,TexasInstrumentsIncorporatedVIn+VIn -Vsupply+ DECEMBER20148 OPA2277is a unity-gainstable,high- Precision ,and 2- to 18-Vsupplieswith specifiedat onlyone supplyvoltage,the OPA2277is specifiedfor real-worldapplications;a singlelimit appliesoverthe 5- to maintainedas the amplifiersswingto ( 50- V max)is so low, useradjustmentis usuallynot OPA2277precisionoperationalamplifierrepl acesthe offersimprovednoise,wideroutputvoltagesw ing,and is twiceas fast with half the drift,low bias current,high common-moderejection,and high easyto use and freefromphaseinversionand overloadproblemsfoundin is stablein unitygain and providesexcellentdynamicbehaviorovera widerangeof load lowestcrosstalkand freedomfrominteraction,evenwhenoverdrive nor 2014,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback11F2RG 150R 141125V1113 IREG 1mA4326RG1250 XTR1051/2 OPA22777 RGRGVIN VIN+VREGIR2V+IRETIOEB8IO= 4mA + (VIN VIN)+ 40RG910RF10k R412 1/2 OPA2277V+V Type J25 (G = 1 += 50)

9 2 RFR50 1k RF10k IR1 VLINRCM= 1250 F opa2277 -EPSBOS700 Applicationand ImplementationNOTEI nformationin the followingapplicationssectionsis not partof the TI componentspecification,and TI doesnot warrantits accuracyor s customersareresponsiblefor determiningsuitabilityof componentsfor test theirdesignimplementationto OPA2277is unity-gainstableand free fromunexpectedoutputphasereversal,making it easyto use in awiderangeof noisyor high-impedancepowersuppliesmayrequiredec ouplingcapacitorscloseto the mostcases, F capacitorsare ThermocoupleLow-Offset, the thermocouplelow-offset,low-driftloopmeas urementwithdiodecoldjunctioncompensation (seeFigure21), Table1 lists the designparametersneededwith gain = 50.(1)Table1. DesignParametersDESIGNPARAMETEREXAMPLEVA LUERF10 k R412 12 SubmitDocumentationFeedbackCopyright 2014,TexasInstrumentsIncorporatedOp Amp(a) opa2277 (b)No bias currentcancellation resistor(see text)Conventional Operational Amplifier with externalbiascurrent cancellation with no external bias currentcancellation R2|| R1V+V 20 k opa2277 single op amp offset adjust pins only to nulloffset voltage of op amp see Range: ExceedsOffset Voltage OPA2277is laser-trimmedfor very-lowoffsetvoltageand drift so mostcircuitsdo not ,offsetvoltagetrim connectionsare providedon pins1 and 8.

10 Offsetvoltagecan beadjustedby connectinga potentiometeras shownin Figure22. Onlyuse this adjustmentto null the offsetof not use this adjustmentto compensatefor offsetscreatedelsewherein a systembecausethis can inputsof the OPA2277are protectedwith1-k seriesinputresistorsand inputscanwithstand protectiondiodesconductcurrentwhenthe slewingbehaviorof unity-gainfollowerapplications,but doesnot inputstagebasecurrentof the OPA2277is internallycompensatedwith an equaland the differencebetweenthe residualinputbias currentcan be positiveor biascurrentis canceledin this manner,the inputbiascurrentandinputoffsetcurrentare approximatelythe a result,it is not necessaryto use a bias currentcancellationresistorasis oftendonewithotheroperationalamplifiers( seeFigure23). A resistoraddedto cancelinputbiascurrenterrorsmay actuallyincreaseoffsetvoltageand InputBiasCurrentCancellationCopyright 2014,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback1340 Supply Voltage (V) IB(nA)VCM= 0 V15 Common-Mode Voltage (V) 15 10 IB(nA)VS= 5 VVS= 15 VR1V 1/2 OPA2277R21/2 opa2277 VOUT= (V1 V2)(1 + )R2R1V+V+V R2R1 LoadCellR+ RV2R RR RR+ RV1 opa2277 -EPSBOS700 integratedsolutionsee: INA126,INA2126(dual),INA125(on-boardrefe rence),or INA122(single-supply).