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ADA4530-1ARZ is a femtoampere (10−15 A) level input bias current operational amplifier suitable for use as an electrometer that also includes an integrated guard buffer. It has an operating voltage range of 4.5 V to 16 V, enabling it to operate in conventional 5 V and 10 V single supply systems as well as ±2.5 V and ±5 V dual supply systems.

Features

Low input bias current

±20 fA maximum at TA = 25°C (guaranteed at production test)

±20 fA maximum at −40°C < TA < +85°C

±250 fA maximum at −40°C < TA < +125°C (guaranteed at production test)

Low offset voltage: 50 μV maximum over specified CMRR range

Offset voltage drift: ±0.13 μV/°C typical, ±0.5 μV/°C maximum

Integrated guard buffer with 100 μV maximum offset

Low voltage noise density: 14 nV/√Hz at 10 kHz

Wide bandwidth: 2 MHz unity-gain crossover

Supply voltage: 4.5 V to 16 V (±2.25 V to ±8 V)

Operating temperature: −40°C to +125°C

Long-term offset voltage drift (10,000 hours): 0.5 μV typical

Temperature hysteresis: 1.5 μV typical

Applications

Laboratory and analytical instrumentation: spectrophotometers, chromatographs, mass spectrometers, and potentiostatic and amperostatic coulometry

Instrumentation: picoammeters and coulombmeters

Transimpedance amplifier (TIA) for photodiodes, ion chambers, and working electrode measurements

High impedance buffering for chemical sensors and capacitive sensors

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