Wide Bandwidth Operational Transconductance ... …

1 0 10 20 30 40 50 60 70 80 Frequency (Hz)Gain (dB)1k10k100k1M10M100M1GC1C2 VINRRVOUTLow Pass Negative Impedance Converter (NIC) FilterFrequency Response of 20kHz and 10 MHzLow Pass NIC Filters20kHzLow Pass Filter10 MHzLow Pass AUGUST2005 REVISEDMAY2013 WideBandwidthOperationalTransconductance Amplifier(OTA)CheckforSamples:OPA861 TheOTAorvoltage-controlledcurrentsourcec anbe1 FEATURES viewedasanidealtransistor. Likea transistor,it has WideBandwidth(80 MHz,Open-Loop,G = +5)threeterminals ahighimpedanceinput(base),a HighSlewRate(900V/ s)low-impedanceinput/output(emitter),and thecurrentoutput(collector).TheOPA861,ho wever,isself- HighTransconductance(95mA/V) LowQuiescentCurrent( )centeredaboutzeroproduceanoutputcurrent , ,allowingbandwidth, Video/BroadcastEquipmentquiescentcurrent ,andgaintrade-offstobe CommunicationsEquipmentoptimized.

2 High-SpeedDataAcquisitionUsedasabasicbui ldingblock,theOPA861 WidebandLEDD riverssimplifiesthedesignofAGCamplifiers ,LEDdrivercircuitsforfiberoptictransmiss ion,integratorsforfast ControlLoopAmplifierspulses,fastcontroll oopamplifiersandcontrol WidebandActiveFiltersamplifiersforcapaci tivesensors,andactivefilters. ,includinghighperformancevideo, wideband,bipolaroperationaltransconducta nceamplifier(OTA).1 Pleasebeawarethatanimportantnoticeconcer ningavailability,standardwarranty,anduse in 2005 2013, = 5 VCV+ = +5 VNCNCSO 8 Top View123654 IQAdjust VSB+VSCESOT23 6 OPA861 SBOS338G AUGUST2005 (1)SPECIFIEDPACKAGETEMPERATUREPACKAGEORD ERINGTRANSPORTMEDIA,PRODUCTPACKAGEDESIGN ATORRANGEMARKINGNUMBERQUANTITYOPA861 IDRails,75 OPA861SO-8D 45 C to+85 COPA861 OPA861 IDRT apeandReel,2500 OPA861 IDBVTT apeandReel,250 OPA861 SOT23-6 DBV 45 C to+85 CN5 ROPA861 IDBVRT apeandReel,3000(1)Forthemostcurrentpacka geandorderinginformation,seethePackageOp tionAddendumattheendofthisdocument, (1)PowerSupply VSStorageTemperatureRange:D 65 C to+125 CLeadTemperature(soldering,10s)+260 CJunctionTemperature(TJ)+150 CESDR ating.

3 HumanBodyModel(HBM)(2)1500 VChargeDeviceModel(CDM)1000V(1) ,andfunctionaloperationsofthedeviceatthe seandanyotherconditionsbeyondthosespecif iedis notsupported.(2)Pin2 fortheSO-8package> fortheSOT23-6package> 2005 2013, AUGUST2005 REVISEDMAY2013 ELECTRICALCHARACTERISTICS:VS= 5 VRL= 500 andRADJ= 250 , ,IDBVTYPMIN/MAXOVERTEMPERATURE0 C to 40 C toMIN/TESTPARAMETERCONDITIONS+25 C+25 C(2)70 C(3)+85 C(3)UNITSMAXLEVEL(1)OTA Open-Loop(seeFigure33)ACPERFORMANCEG = +5,VO= 200mVPP,Bandwidth80777574 MHzminBRL= 500 G = +5,VO= 1 VPP80 MHztypCG = +5,VO= 5 VPP80 MHztypCSlewRateG = +5,VO= 5 VStep900860850840V/ sminBRiseTimeandFallTimeVO= = +5,VO= 2 VPP, 5 MHz2nd-HarmonicRL= 500 68 55 54 53dBmaxB3rd-HarmonicRL= 500 57 52 51 49dBmaxBBaseInputVoltageNoisef > HzmaxBBaseInputCurrentNoisef > HzmaxBEmitterInputCurrentNoisef > HzmaxBOTADCPERFORMANCE(4)(seeFigure33)Mi nimumOTAT ransconductance(gm)VO= 10mV,RC= 50 , RE= 0 95807775mA/VminAMaximumOTAT ransconductance(gm)

4 VO= 10mV,RC= 50 , RE= 0 95150155160mA/VmaxAB-InputOffsetVoltageV B= 0V,RC= 0 , RE= 100 3 12 15 20mVmaxAAverageB-InputOffsetVoltageDrift VB= 0V,RC= 0 , RE= 100 67 120 V/ CmaxBB-InputBiasCurrentVB= 0V,RC= 0 , RE= 100 1 5 6 AmaxAAverageB-InputBiasCurrentDriftVB= 0V,RC= 0 , RE= 100 20 25nA/ CmaxBE-InputBiasCurrentVB= 0V,VC= 0V 30 100 125 140 AmaxAAverageE-InputBiasCurrentDriftVB= 0V,VC= 0V 500 600nA/ CmaxBC-OutputBiasCurrentVB= 0V,VC= 0V 5 18 30 38 AmaxAAverageC-OutputBiasCurrentDriftVB= 0V,VC= 0V 250 300nA/ CmaxBOTAINPUT(seeFigure33)B-InputVoltage Range || || minBOTAOUTPUTE-OutputVoltageComplianceIE = 1mA ,Sinking/SourcingVE= 0 15 10 9 9mAminAC-OutputVoltageComplianceIC= 1mA ,Sinking/SourcingVC= 0 15 10 9 9mAminAC-OutputImpedance54|| 2k || pFtypC(1)Testlevels:(A)100%testedat+25 (B)Limitssetbycharacterizationandsimulat ion.

5 (C)Typicalvalueonlyforinformation.(2)Jun ctiontemperature= ambientfor+25 C specifications.(3)Junctiontemperature= ambientatlowtemperaturelimit;junctiontem perature= ambient+ 7 C athightemperaturelimitforovertemperature specifications.(4)Currentis 2005 2013,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback3 ProductFolderLinks:OPA861 OPA861 SBOS338G AUGUST2005 :VS= 5V(continued)RL= 500 andRADJ= 250 , ,IDBVTYPMIN/MAXOVERTEMPERATURE0 C to 40 C toMIN/TESTPARAMETERCONDITIONS+25 C+25 C(2)70 C(3)+85 C(3)UNITSMAXLEVEL(1)POWERSUPPLYS pecifiedOperatingVoltage 5 VtypCMaximumOperatingVoltage 250 250 (+PSRR) IC/ VS 20 50 60 65 A/VmaxATHERMALCHARACTERISTICSS pecification:ID,IDBV 40to+85 CtypCThermalResistance JADSO-8 Junction-to-Ambient+125 C/WtypCDBVSOT23-6 Junction-to-Ambient+150 C/WtypC4 SubmitDocumentationFeedbackCopyright 2005 2013, AUGUST2005 REVISEDMAY2013 ELECTRICALCHARACTERISTICS.

6 VS= +5 VRL= 500 toVS/2andRADJ= 250 , ,IDBVTYPMIN/MAXOVERTEMPERATURE0 C to 40 C toMIN/TESTPARAMETERCONDITIONS+25 C+25 C(2)70 C(3)+85 C(3)UNITSMAXLEVEL(1)OTA Open-Loop(seeFigure33)ACPERFORMANCEG = +5,VO= 200mVPP,Bandwidth73727270 MHzminBRL= 500 G = +5,VO= 1 VPP73 MHztypCSlewRateG = +5,VO= sminBRiseTimeandFallTimeVO= = +5,VO= 2 VPP, 5 MHz2nd-HarmonicRL= 500 67 55 54 54dBmaxB3rd-HarmonicRL= 500 57 50 49 48dBmaxBBaseInputVoltageNoisef > HzmaxBBaseInputCurrentNoisef > HzmaxBEmitterInputCurrentNoisef > HzmaxBOTADCPERFORMANCE(4)(seeFigure33)Mi nimumOTAT ransconductance(gm)VO= 10mV,RC= 50 , RE= 0 85706765mA/VminAMaximumOTAT ransconductance(gm)VO= 10mV,RC= 50 , RE= 0 85140145150mA/VmaxAB-InputOffsetVoltageV B= 0V,RC= 0 , RE= 100 3 12 15 20mVmaxAAverageB-InputOffsetVoltageDrift VB= 0V,RC= 0 , RE= 100 67 120 V/ CmaxBB-InputBiasCurrentVB= 0V,RC= 0 , RE= 100 1 5 6 AmaxAAverageB-InputBiasCurrentDriftVB= 0V,RC= 0 , RE= 100 20 25nA/ CmaxBE-InputBiasCurrentVB= 0V,VC= 0V 30 100 125 140 AmaxAAverageE-InputBiasCurrentDriftVB= 0V,VC= 0V 500 600nA/ CmaxBC-OutputBiasCurrentVB= 0V,VC= 0V 15 AtypCOTAINPUT(seeFigure33) || || minBOTAOUTPUTM aximumE-OutputVoltageComplianceIE= ,Sinking/SourcingVE= 0 8 7 ,Sinking/SourcingVC= 0 8 7 || 2k || pFtypC(1)Testlevels:(A)100%testedat+25 (B)Limitssetbycharacterizationandsimulat ion.

7 (C)Typicalvalueonlyforinformation.(2)Jun ctiontemperature= ambientfor+25 C specifications.(3)Junctiontemperature= ambientatlowtemperaturelimit;junctiontem perature= ambient+ 3 C athightemperaturelimitforovertemperature specifications.(4)Currentis 2005 2013,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback5 ProductFolderLinks:OPA861 OPA861 SBOS338G AUGUST2005 :VS= +5V(continued)RL= 500 toVS/2andRADJ= 250 , ,IDBVTYPMIN/MAXOVERTEMPERATURE0 C to 40 C toMIN/TESTPARAMETERCONDITIONS+25 C+25 C(2)70 C(3)+85 C(3)UNITSMAXLEVEL(1) 250 250 (+PSRR) IC/ VS 20 50 60 65 A/VmaxATHERMALCHARACTERISTICSS pecification:ID,IDBV 40to+85 CtypCThermalResistance JADSO-8 Junction-to-Ambient+125 C/WtypCDBVSOT23-6 Junction-to-Ambient+150 C/WtypC6 SubmitDocumentationFeedbackCopyright 2005 2013, (10ns/div)Output Voltage (V)G = +5V/VRL= 500 VIN= 20 MHzSee Figure 483210 1 2 3 Time (10ns/div)Output Voltage (V)G = +5V/VRL= 500 VIN= 1 VPPfIN= 20 MHzSee Figure 48160140120100806040200 Input Voltage (mV) Transconductance (mA/V) 40 30 20 10010203040IQ= signal around input 2 4 6 8 OTA Input Voltage (mV)OTA Output Current (mA) 70 60 50 40 30 20 10 010 2030 40 506070IQ= 50 1501209060300 Quiescent Current (mA) Transconductance (mA/V)12345678 VIN= 100mVPPg = + (Hz) Transconductance (mA/V)

8 1M10M100M1 GRL= 50 VIN= 10mVPPIQ= (117mA/V)IQ= (102mA/V)IQ= (79mA/V)IQ= (51mA/V)IO UTVI N50 50 AUGUST2005 REVISEDMAY2013 TYPICALCHARACTERISTICS:VS= 5 VAtTA= +25 C,IQ= ,andRL= 500 , 2005 2013,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback7 ProductFolderLinks:OPA861876543210 Quiescent Current Adjust Resistor ( )Quiescent Current (mA) Current Adjust Resistor ( )0200 400 600 800 1000 1200 1400 1600 1800 2000 Input Voltage Noise Density (nV/ Hz)Input Current Noise Density (pA/ Hz)E Input Current Noise (pA/ Hz)B Input Voltage Noise (nV/ Hz)B Input Current Noise (pA/ Hz)6050403020100 Quiescent Current (mA)OTA E- Output Resistance ( )W013245678100101 Frequency (Hz)1001k10k100k1M10 MInput Voltage Noise Density (nV/ Hz)Input Current Noise Density (pA/ Hz)E Input Current Noise ( Hz)B Input Voltage Noise ( Hz)B Input Current Noise ( Hz)500490480470460450440430 Quiescent Current (mA)OTA B- Input Resistance (k )

9 W013245678120110100908070605040 Quiescent Current (mA)OTA C- Output Resistance (k )W013245678 OPA861 SBOS338G AUGUST2005 :VS= 5V(continued)AtTA= +25 C,IQ= ,andRL= 500 , 2005 2013,TexasInstrumentsIncorporatedProduct FolderLinks:OPA861250200150100500 Quiescent Current Adjust Resistor ( )WI Adjust Pin Bias Current ( A) Current Adjust Resistor ( )WI /IRatioQ 5E-18 x R-ADJADJADJADJ432+ 1E-12 x R7E-08 x R+ x R+ = Quiescent Current flowing out of I adjust 10 20 30 40 Ambient Temperature (_C)OTA C Output Bias Current ( A) 40 20020406080100120 Five Representative Units9876543 Ambient Temperature (_C)Quiescent Current (mA) 40 200204060801001206420 2 4 6 Ambient Temperature (_C)Offset Voltage (mV)3210 1 2 3 Input Bias Current ( A) 40 20020406080100120B Input Offset VoltageB Input Bias AUGUST2005 REVISEDMAY2013 TYPICALCHARACTERISTICS.

10 VS= 5V(continued)AtTA= +25 C,IQ= ,andRL= 500 , 2005 2013,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback9 (10ns/div)Output Voltage (V)G = +5V/VRL= 500 VIN= (10ns/div)Output Voltage (V)G = +5V/VRL= 500 VIN= 20 MHz120100806040200 Input Voltage (mV) Transconductance (mA/V) 30 20 100102030 Small signal around input 2 4 6 OTA Input Voltage (mV)OTA Output Current (mA) 50 40 30 20 1001020304050IQ= 0 50 1501209060300 Quiescent Current (mA) Transconductance (mA/V)01234567 VIN= 100mVPPIOUTVIN50 50 10010 Frequency (Hz)OTA Transconductance (mA/V)1101001kRL= 50 VIN= 10mVPPIQ= (93mA/V)IQ= (80mA/V)IQ= (60mA/V)IQ= (37mA/V)IOU TVIN50 50 OPA861 SBOS338G AUGUST2005 :VS= +5 VAtTA= +25 C,IQ= ,andRL= 500 toVS/2, 2005 2013,TexasInstrumentsIncorporatedProduct FolderLinks:OPA86176543210 Quiescent Current Adjust Resistor ( )Quiescent Current (mA) Current (mA)OTA E Output Resistance ( )01234567500490480470460450440430420 Quiescent Current (mA)OTA B Input Resistance (k )01234567120110100908070605040 Quiescent Current (mA)OTA C Output Resistance (k ) AUGUST2005 REVISEDMAY2013 TYPICALCHARACTERISTICS:VS= +5V(continued)AtTA= +25 C,IQ= ,andRL= 500 toVS/2, 2005 2013,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback11 ProductFolderLinks:OPA86112348765R(25 to 200 ) FmRADJ250W-5V(1)VIN+ FmSolidTantalum+5V(1)+ FmSolid TantalumR = 250 , roughly sets IWQQ=.