LT1793

Input Bias Current, Warmed Up: 10pA Max
100% Tested Low Voltage Noise: 8nV/ÖHz Max
A Grade 100% Temperature Tested
Offset Voltage Over Temp: 1mV Max
Input Resistance: 1013W
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 Instrumentation Amplifier Front Ends
Two and Three Op Amp Instrumentation Amplifiers
Active Filters

Supply Voltage ....................................................±20V
Differential Input Voltage ....................................±40V
Input Voltage (Equal to Supply Voltage) .............±20V
Output Short-Circuit Duration ........................Indefinite
Operating Temperature Range ..........40°C to 85°C
Specified Temperature Range
Commercial (Note 8) ......................... 40°C to 85°C
Industrial .......................................... 40°C to 85°C
Storage Temperature Range ...........65°C to 150°C
Lead Temperature (Soldering, 10 sec) ..............300°C

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/ÖHz) is simultaneously offered with extremely low current noise (0.8fA/ÖHz), providing the lowest total noise for high impedance transducer applications. Unlike most JFET op amps, the very low input bias current (3pA typ) is maintainedover the entire common mode range which results in an extremely high input resistance (1013W). When combined with a very low input capacitance (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 250mV VOS and a voltage gain over 4 million. Each individual amplifier is 100% tested for voltage noise, slew rate (3.4V/ms) 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.