GENERAL DESCRIPTION

The AD623 is an integrated single-supply instrumentation amplifier that delivers rail-to-rail output swing on a 3 V to 12 V supply. The AD623 offers superior user flexibility by allowing single gain set resistor programming and by conforming to the 8-lead industry standard pinout configuration. With no external

resistor, the AD623 is configured for unity gain (G = 1), and with an external resistor, the AD623 can be programmed for gains up to 1000.

FEATURES

Easy to use

Higher performance than discrete design

Single-supply and dual-supply operation

Rail-to-rail output swing

Input voltage range extends 150 mV below ground (single supply)

Low power, 550 μA maximum supply current

Gain set with one external resistor

Gain range: 1 (no resistor) to 1000

High accuracy dc performance

0.10 gain accuracy (G = 1)

0.35 gain accuracy (G > 1)

10 ppm maximum gain drift (G = 1)

200 μV maximum input offset voltage (AD623A)

2 μV/°C maximum input offset drift (AD623A)

100 μV maximum input offset voltage (AD623B)

1 μV/°C maximum input offset drift (AD623B)

25 nA maximum input bias current

Noise: 35 nV/√Hz RTI noise @ 1 kHz (G = 1)

Excellent ac specifications

90 dB minimum CMRR (G = 10); 70 dB minimum CMRR (G = 1) at 60 Hz, 1 kΩ source imbalance

800 kHz bandwidth (G = 1)

20 μs settling time to 0.01 (G = 10)

APPLICATIONS

Low power medical instrumentation

Transducer interfaces

Thermocouple amplifiers

Industrial process controls

Difference amplifiers

Low power data acquisition