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 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
PIN CONFIGURATION
R
G 1
–IN
2
+IN
3
–V
S 4
AD622
8
7
6
5
R
G
+V
S
00777-001
OUTPUT
REF
Figure 1. 8-Lead PDIP and 8-Lead SOIC_N
(N and R Suffixes)
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.
The AD622 replaces low cost, discrete, two or three op amp
instrumentation amplifier designs and offers good common-
mode rejection, superior linearity, temperature stability,
reliability, and board area consumption. The low cost of the
AD622 eliminates the need to design discrete instrumentation
amplifiers to meet stringent cost targets. While providing a
lower cost solution, it also provides performance and space
improvements.
APPLICATIONS
Transducer interface
Low cost thermocouple amplifier
Industrial process controls
Difference amplifier
Low cost data acquisition
Rev. D
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rights of third parties that may result from its use. Specifications subject to change without notice. No
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