Datasheet AD622 (Analog Devices)

Low Cost Instrumentation Amplifier Data Sheet AD622 FEATURES PIN CONFIGURATION Easy to use RG 1 8 RG AD622 Low cost solution –IN 2 7 +VS Higher performance than two or three op amp design +IN 3 6 OUTPUT Unity gain with no external resistor
001
Optional gains with one external resistor –VS 4 5 REF
00777-
(Gain range: 2 to 1000)
Figure 1. 8-Lead PDIP and 8-Lead SOIC_N (N and R Suffixes)
Wide power supply range: ±2.6 V to ±15 V Available in 8-lead PDIP and 8-lead SOIC_N packages GENERAL DESCRIPTION Low power, 1.5 mA maximum supply current
The AD622 is a low cost, moderately accurate instrumentation
DC performance
amplifier in the traditional pin configuration that requires only
0.15% gain accuracy: G = 1
one external resistor to set any gain between 2 and 1000. For a
125 µV maximum input offset voltage
gain of 1, no external resistor is required. The AD622 is a
1.0 µV/°C maximum input offset drift
complete difference or subtractor amplifier system that also
5 nA maximum input bias current
provides superior linearity and common-mode rejection by
66 dB minimum common-mode rejection ratio: G = 1
incorporating precision laser-trimmed resistors.
Noise 12 nV/√Hz @ 1 kHz input voltage noise
The AD622 replaces low cost, discrete, two or three op amp
0.60 µV p-p noise: 0.1 Hz to 10 Hz, G = 10
instrumentation amplifier designs and offers good common-
AC characteristics
mode rejection, superior linearity, temperature stability,
800 kHz bandwidth: G = 10
reliability, power, and board area consumption. The low cost of
10 µs settling time to 0.1% @ G = 1 to 100
the AD622 eliminates the need to design discrete
1.2 V/µs slew rate
instrumentation amplifiers to meet stringent cost targets. While
APPLICATIONS
providing a lower cost solution, it also provides performance and space improvements.
Transducer interface Low cost thermocouple amplifier Table 1. Next Generation Upgrades for AD622 Industrial process controls Part Comment Difference amplifier
AD8221 Better specs at lower price
Low cost data acquisition
AD8222 Dual channel or differential out

AD8226 Low power, wide input range AD8220 JFET input AD8228 Best gain accuracy AD8295 +2 precision op amps or differential out AD8421 Low noise, better specs
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Document Outline Features Applications Pin Configuration General Description Revision History Specifications Absolute Maximum Ratings Thermal Resistance ESD Caution Typical Performance Characteristics Theory of Operation Make vs. Buy: A Typical Application Error Budget Gain Selection Input and Output Offset Voltage Reference Terminal Input Protection RF Interference Ground Returns for Input Bias Currents Outline Dimensions Ordering Guide