Low Cost Instrumentation Amplifier
Data Sheet
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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
PIN CONFIGURATION
R
G
1
–IN
2
+IN
3
–V
S
4
R
G
8
+V
S
7
OUTPUT
6
REF
5
AD622
00777-001
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 in the traditional pin configuration 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 subtractor 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, power, 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.
Table 1. Next Generation Upgrades for AD622
Part Comment
AD8221
Better specs at lower price
Dual channel or differential out
Low power, wide input range
+2 precision op amps or differential out
