GENERAL DESCRIPTION

The AD622 is a low cost, moderately accurate instrumentation amplifier that requires only one external resistor to set any gain between 2 and 1000. For a gain of 1, no external resistor is required. The AD622 is a complete difference or subtracter amplifier system that also provides superior linearity and common-mode rejection by incorporating precision laser-trimmed resistors.

FEATURES

Easy to use

Low cost solution

Higher performance than two or three op amp design

Unity gain with no external resistor

Optional gains with one external resistor (Gain range: 2 to 1000)

Wide power supply range: ±2.6 V to ±15 V

Available in 8-lead PDIP and 8-lead SOIC_N packages

Low power, 1.5 mA maximum supply current

DC performance 0.15 gain accuracy: G = 1 125 μV maximum input offset voltage 1.0 μV/°C maximum input offset drift 5 nA maximum input bias current 66 dB minimum common-mode rejection ratio: G = 1

Noise 12 nV/√Hz @ 1 kHz input voltage noise 0.60 μV p-p noise: 0.1 Hz to 10 Hz, G = 10

AC characteristics 800 kHz bandwidth: G = 10 10 μs settling time to 0.1 @ G = 1 to 100 1.2 V/μs slew rate

APPLICATIONS

Transducer interface

Low cost thermocouple amplifier

Industrial process controls

Difference amplifier

Low cost data acquisition