ADA4530-1

Data Sheet ADA4530-1 Femtoampere Input Bias Current Electrometer Amplifier FEATURES PIN CONNECTION DIAGRAM ► 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 Figure 1. APPLICATIONS ► Laboratory and analytical instrumentation: spectrophoto-meters, 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 GENERAL DESCRIPTION The ADA4530-1 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 ...