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ADI LT1793CS8 Low Noise Picoampere Bias Current JFET Input Operational Amplifiers

Product Description Of LT1793CS8

LT1793CS8 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 applications. 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 resistance (1013Ω). When combined with a very low input capacitance (1.5pF) an extremely high input impedance results, making the LT1793CS8 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.

LT1793CS8 is unconditionally stable for gains of 1 or more, even with 1000pF capacitive loads. Other key features are 250µV VOS and a voltage gain over 4 million. Each individual 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.

Feature Of LT1793CS8

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

Applications Of LT1793CS8

Photocurrent Amplifiers

Hydrophone Amplifiers

High Sensitivity Piezoelectric Accelerometers

Low Voltage and Current Noise Instrumentation Amplifier Front Ends

Two and Three Op Amp Instrumentation Amplifiers

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