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UCD PHY 116A - LECTURE NOTES

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1LT1793Low Noise,Picoampere Bias Current,JFET Input Op Amp1kHz Output Voltage NoiseDensity vs Source ResistanceSOURCE RESISTANCE (Ω)10k1k100101100 10k 100k 1M1k10M1793 TA02TOTAL 1kHz VOLTAGE NOISE DENSITY (nV/√Hz)100M1G–+VNRSOURCETA = 25°CVS = ±15VVNSOURCERESISTANCEONLYVN = √(VOP AMP)2 + 4kTRS + 2qIBRS2The LT®1793 achieves a new standard of excellence innoise performance for a JFET op amp. For the first time lowvoltage noise (6nV/√Hz) is simultaneously offered withextremely low current noise (0.8fA/√Hz), providing thelowest total noise for high impedance transducer applica-tions. Unlike most JFET op amps, the very low input biascurrent (3pA typ) is maintained over the entire commonmode range which results in an extremely high input resis-tance (1013Ω). When combined with a very low input ca-pacitance (1.5pF) an extremely high input impedanceresults, making the LT1793 the first choice for amplifyinglow level signals from high impedance transducers. Thelow input capacitance also assures high gain linearity whenbuffering AC signals from high impedance transducers.The LT1793 is unconditionally stable for gains of 1 or more,even with 1000pF capacitive loads. Other key features are250µV VOS and a voltage gain over 4 million. Each indi-vidual amplifier is 100% tested for voltage noise, slew rate(3.4V/µs) and gain-bandwidth product (4.2MHz).Specifications at ±5V supply operation are also provided.For an even lower voltage noise please see the LT1792 datasheet.■Input Bias Current, Warmed Up: 10pA Max■100% Tested Low Voltage Noise: 8nV/√Hz Max■A Grade 100% Temperature Tested■Offset Voltage Over Temp: 1mV Max■Input Resistance: 1013Ω■Very Low Input Capacitance: 1.5pF■Voltage Gain: 1 Million Min■Gain-Bandwidth Product: 4.2MHz Typ■Guaranteed Specifications with ±5V Supplies■Photocurrent Amplifiers■Hydrophone Amplifiers■High Sensitivity Piezoelectric Accelerometers■Low Voltage and Current Noise InstrumentationAmplifier Front Ends■Two and Three Op Amp Instrumentation Amplifiers■Active Filters, LTC and LT are registered trademarks of Linear Technology Corporation.1793 TA01R11MC12pF–+LT1097R2C2 > C1R1CD = PARASITIC PHOTODIODE CAPACITANCEVOUT = 100mV/µWATT FOR 200nm WAVE LENGTH330mV/µWATT FOR 633nm WAVE LENGTHR510kD21N914V–V–V+R41kD11N914R31k67432–+LT1793V+V–C2 0.022µFHAMAMATSUS1336-5BK(908) 231-0960VOUTR2100kCD2N3904Low Noise Light Sensor with DC ServoFEATURESDESCRIPTIOUAPPLICATIO SUTYPICAL APPLICATIOU2LT1793AUGWAWUWARBSOLUTEXI TIS(Note 1)Supply Voltage ..................................................... ±20VDifferential Input Voltage ...................................... ±40VInput Voltage (Equal to Supply Voltage)............... ±20VOutput Short-Circuit Duration ........................ IndefiniteOperating Temperature Range............... –40°C to 85°CSpecified Temperature RangeCommercial (Note 8) ......................... – 40°C to 85°CIndustrial ........................................... – 40°C to 85°CStorage Temperature Range................ –65°C to 150°CLead Temperature (Soldering, 10 sec) ................ 300°CWUUPACKAGE/ORDER I FOR ATIOConsult factory for Military grade parts.TJMAX = 150°C, θJA = 80°C/WORDER PARTNUMBERLT1793ACN8LT1793CN8LT1793AIN8LT1793IN812348765TOP VIEWN8 PACKAGE8-LEAD PDIPAVOS ADJ–IN A+IN AV–NCV+OUTVOS ADJORDER PARTNUMBERS8 PART MARKINGLT1793ACS8LT1793CS8LT1793AIS8LT1793IS81793A1793TJMAX = 160°C, θJA = 190°C/W12348765TOP VIEWS8 PACKAGE8-LEAD PLASTIC SOVOS ADJ–IN A+IN AV–NCV+OUTVOS ADJA1793AI1793ILT1793C/LT1793ISYMBOL PARAMETER CONDITIONS (Note 2) MIN TYP MAX MIN TYP MAX UNITSVOSInput Offset Voltage 0.25 0.8 0.25 0.9 mVVS = ±5V 0.45 1.4 0.45 1.6 mVIOSInput Offset Current Warmed Up (Note 3) 1.5 7 2.5 15 pATJ = 25°C (Note 6) 0.5 2 0.7 4 pAIBInput Bias Current Warmed Up (Note 3) 3 10 4.0 20 pATJ = 25°C (Note 6) 1 3 1.5 5 pAenInput Noise Voltage 0.1Hz to 10Hz 2.4 2.4 µVP-PInput Noise Voltage Density fO = 10Hz 11.5 11.5 nV/√HzfO = 1000Hz 6 8 6 8 nV/√HzinInput Noise Current Density fO = 10Hz, fO = 1kHz (Note 4) 0.8 1 fA/√HzRINInput Resistance Differential Mode 10141014Ω Common Mode VCM = –10V to 13V 10131013ΩCINInput Capacitance 1.5 1.5 pFVS = ±5V 2.0 2.0 pFVCMInput Voltage Range (Note 5) 13.0 13.5 13.0 13.5 V–10.5 –11.0 – 10.5 – 11.0 VCMRR Common Mode Rejection Ratio VCM = –10V to 13V 83 102 81 96 dBPSRR Power Supply Rejection Ratio VS = ±4.5V to ± 20V 85 98 83 95 dBTA = 25°C, VS = ±15V, VCM = 0V, unless otherwise noted.ELECTRICAL C CHARA TERISTICSLT1793AC/LT1793AI3LT1793ELECTRICAL C CHARA TERISTICSTA = 25°C, VS = ±15V, VCM = 0V, unless otherwise noted.LT1793C/LT1793ISYMBOL PARAMETER CONDITIONS (Note 2) MIN TYP MAX MIN TYP MAX UNITSAVOLLarge-Signal Voltage Gain VO = ±12V, RL = 10k 1000 4500 900 4400 V/mVVO = ±10V, RL = 1k 500 3500 400 3000 V/mVVOUTOutput Voltage Swing RL = 10k ±13.0 ±13.2 ±13.0 ±13.2 VRL = 1k ±12.0 ±12.3 ±12.0 ±12.3 VSR Slew Rate RL ≥ 2k (Note 7) 2.3 3.4 2.3 3.4 V/µsGBW Gain-Bandwidth Product fO = 100kHz 2.5 4.2 2.5 4.2 MHzISSupply Current 4.2 5.20 4.2 5.20 mAVS = ±5V 4.2 5.15 4.2 5.15 mAOffset Voltage RPOT (to VEE) = 10k 13 13 mVAdjustment RangeLT1793AC LT1793CSYMBOL PARAMETER CONDITIONS (Note 2) MIN TYP MAX MIN TYP MAX UNITSVOSInput Offset Voltage ● 0.50 1.0 1.0 3.5 mVVS = ±5V ● 0.75 1.6 1.6 4.2 mV ∆VOSAverage Input Offset (Note 6) ● 513 850 µV/°C∆Temp Voltage DriftIOSInput Offset Current ● 15 100 20 130 pAIBInput Bias Current ● 130 400 150 500 pAVCMInput Voltage Range (Note 5) ● 12.9 13.4 12.9 13.4 V● –10.0 –10.8 – 10.0 – 10.8 VCMRR Common Mode Rejection Ratio VCM = –10V to 12.9V ● 79 100 77 95 dBPSRR Power Supply Rejection Ratio VS = ±4.5V to ± 20V ● 83 97 81 94 dBAVOLLarge-Signal Voltage Gain VO = ±12V, RL = 10k ● 900 3600 800 3400 V/mVVO = ±10V, RL = 1k ● 500 2600 400 2400 V/mVVOUTOutput Voltage Swing RL = 10k ● ±12.9 ±13.2 ±12.9 ±13.2 VRL = 1k ● ±11.9 ±12.15 ±11.9 ±12.15 VSR Slew Rate RL ≥ 2k (Note 7) ● 2.2 3.3 2.2 3.3 V/µsGBW Gain-Bandwidth Product fO = 100kHz ● 2.2 3.3 2.2 3.3 MHzISSupply Current ● 4.2 5.30 4.2 5.30 mAVS = ±5V ● 4.2 5.25 4.2 5.25 mAThe ● denotes specifications which apply over the temperature range 0°C ≤ TA ≤ 70°C, otherwise specifications are at TA = 25°C.VS = ±15V, VCM = 0V, unless otherwise noted. (Note 9)LT1793AC/LT1793AI4LT1793ELECTRICAL C CHARA TERISTICSThe ● denotes


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