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LT1793AIS8 Datasheet(PDF) 1 Page - Linear Technology |
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LT1793AIS8 Datasheet(HTML) 1 Page - Linear Technology |
1 / 12 page 1 LT1793 Low Noise, Picoampere Bias Current, JFET Input Op Amp 1kHz Output Voltage Noise Density vs Source Resistance SOURCE RESISTANCE ( Ω) 10k 1k 100 10 1 100 10k 100k 1M 1k 10M 1793 TA02 100M 1G – + VN RSOURCE TA = 25°C VS = ±15V VN SOURCE RESISTANCE ONLY VN = √(V OP AMP) 2 + 4kTRS + 2qIBRS2 The LT ®1793 achieves a new standard of excellence in noise performance for a JFET op amp. For the first time low voltage noise (6nV/ √Hz) is simultaneously offered with extremely low current noise (0.8fA/ √Hz), providing the lowest total noise for high impedance transducer applica- tions. Unlike most JFET op amps, the very low input bias current (3pA typ) is maintained over the entire common mode range which results in an extremely high input resis- tance (1013 Ω). When combined with a very low input ca- pacitance (1.5pF) an extremely high input impedance results, making the LT1793 the first choice for amplifying low level signals from high impedance transducers. The low input capacitance also assures high gain linearity when buffering 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 are 250 µV 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 data sheet. s Input Bias Current, Warmed Up: 10pA Max s 100% Tested Low Voltage Noise: 8nV/ √Hz Max s A Grade 100% Temperature Tested s Offset Voltage Over Temp: 1mV Max s Input Resistance: 1013 Ω s Very Low Input Capacitance: 1.5pF s Voltage Gain: 1 Million Min s Gain-Bandwidth Product: 4.2MHz Typ s Guaranteed Specifications with ±5V Supplies s Photocurrent Amplifiers s Hydrophone Amplifiers s High Sensitivity Piezoelectric Accelerometers s Low Voltage and Current Noise Instrumentation Amplifier Front Ends s Two and Three Op Amp Instrumentation Amplifiers s Active Filters , LTC and LT are registered trademarks of Linear Technology Corporation. 1793 TA01 R1 1M C1 2pF LT1097 R2C2 > C1R1 CD = PARASITIC PHOTODIODE CAPACITANCE VOUT = 100mV/µWATT FOR 200nm WAVE LENGTH 330mV/ µWATT FOR 633nm WAVE LENGTH R5 10k D2 1N914 V – V – V + R4 1k D1 1N914 R3 1k 6 7 4 3 2 LT1793 V + V – C2 0.022 µF HAMAMATSU S1336-5BK (908) 231-0960 VOUT R2 100k CD 2N3904 Low Noise Light Sensor with DC Servo FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO |
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