CONNECTION DIAGRAM

1

2

3

4

AD622

REF

OUTPUT

–IN

+IN

8

7

6

5

REV. C

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reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

a

Low Cost

Instrumentation Amplifier

AD622

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 SOIC

Low Power, 1.5 mA max Supply Current

GOOD DC PERFORMANCE

0.15% Gain Accuracy (G = 1)

125

V max Input Offset Voltage

1.0

V/ C max Input Offset Drift

5 nA max Input Bias Current

66 dB min Common-Mode Rejection Ratio (G = 1)

NOISE

12 nV/

√Hz @ 1 kHz Input Voltage Noise

0.60

V p-p Noise (0.1 Hz to 10 Hz, G = 10)

EXCELLENT AC CHARACTERISTICS

800 kHz Bandwidth (G = 10)

10

s Settling Time to 0.1% @ G = 1–100

1.2 V/ s Slew Rate

APPLICATIONS

Transducer Interface

Low Cost Thermocouple Amplifier

Industrial Process Controls

Difference Amplifier

Low Cost Data Acquisition

PRODUCT DESCRIPTION

The AD622 is a low cost, moderately accurate instrumentation

amplifier that requires only one external resistor to set any gain

between 2 and 1,000. Or for a gain of 1, no external resistor

is required. The AD622 is a complete difference or subtracter

amplifier “system” while providing superior linearity and common-

mode rejection by incorporating precision laser trimmed resistors.

The AD622 replaces low cost, discrete, two or three op amp

instrumentation amplifier designs and offers good common-

mode rejection, superior linearity, temperature stability, reliabil-

ity, and board area consumption. The low cost of the AD622

eliminates the need to design discrete instrumentation amplifi-

ers to meet stringent cost targets. While providing a lower cost

solution, it also provides performance and space improvements.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

World Wide Web Site: http://www.analog.com

Fax: 781/326-8703

© Analog Devices, Inc., 1999