CONNECTION DIAGRAM
1
2
3
4
AD622
R
G
REF
OUTPUT
+V
S
R
G
–IN
+IN
–V
S
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 (62.6 V to 615 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 mV max Input Offset Voltage
1.0 mV/8C 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 mV

p-p

Noise (0.1 Hz to 10 Hz, G = 10)
EXCELLENT AC CHARACTERISTICS
800 kHz Bandwidth (G = 10)
10 ms Settling Time to 0.1% @ G = 1–100
1.2 V/ms 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