Data Sheet
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
Low Cost Instrumentation Amplifier
AD622
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 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
AD8221
AD8222
AD8226
AD8220
AD8228
AD8295
AD8421
Comment
Better specs at lower price
Dual channel or differential out
Low power, wide input range
JFET input
Best gain accuracy
+2 precision op amps or differential out
Low noise, better specs
APPLICATIONS
Transducer interface
Low cost thermocouple amplifier
Industrial process controls
Difference amplifier
Low cost data acquisition
Rev. E
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AD622*
Last content update 09/09/2013 12:42 am
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AN-589:
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A Designer’s Guide to Instrumentation Amplifiers (3rd Edition)
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AD622
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Pin Configuration ............................................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 5
Thermal Resistance ...................................................................... 5
ESD Caution .................................................................................. 5
Typical Performance Characteristics ............................................. 6
Data Sheet
Theory of Operation .........................................................................9
Make vs. Buy: A Typical Application Error Budget ..................9
Gain Selection ................................................................................. 11
Input and Output Offset Voltage .............................................. 11
Reference Terminal .................................................................... 11
Input Protection ......................................................................... 11
RF Interference ........................................................................... 12
Ground Returns for Input Bias Currents ................................ 12
Outline Dimensions ....................................................................... 13
Ordering Guide .......................................................................... 14
REVISION HISTORY
6/12—Rev. D to Rev. E
Changes to General Description Section; Added Table 1 ........... 1
Changes to Theory of Operation Section and Figure 16............. 9
Changes to Table 5 .......................................................................... 10
Changes to Input Selection Section; Deleted Large Input
Voltages at Large Gains Section; Added Figure 18, Renumbered
Sequentially ..................................................................................... 11
Changes to Ordering Guide .......................................................... 14
8/07—Rev. C to Rev. D
Updated Format .................................................................. Universal
Added Thermal Resistance Section ............................................... 5
Added Figure 16................................................................................ 9
Added Large Input Voltages at Large Gains Section ................. 11
Replaced RF Interference Section ................................................ 11
Deleted Grounding Section .......................................................... 10
Deleted Figure 16............................................................................ 10
Changes to Ground Returns for Input Bias Currents Section .. 12
Updated Outline Dimensions ....................................................... 13
Changes to Ordering Guide .......................................................... 14
4/99—Rev. B to Rev. C
8/98—Rev. A to Rev. B
2/97—Rev. 0 to Rev. A
1/96—Revision 0: Initial Version
Rev. E | Page 2 of 16
Data Sheet
SPECIFICATIONS
T
A
= 25°C, V
S
= ±15 V, and R
L
= 2 kΩ typical, unless otherwise noted.
Table 2.
Parameter
GAIN
Gain Range
Gain Error
1
G=1
G = 10
G = 100
G = 1000
Nonlinearity
G = 1 to 1000
G = 1 to 100
Gain vs. Temperature
VOLTAGE OFFSET
Input Offset, V
OSI
Average Temperature Coefficient
Output Offset, V
OSO
Average Temperature Coefficient
Offset Referred to Input vs. Supply (PSR)
G=1
G = 10
G = 100
G = 1000
INPUT CURRENT
Input Bias Current
Average Temperature Coefficient
Input Offset Current
Average Temperature Coefficient
INPUT
Input Impedance
Differential
Common Mode
Input Voltage Range
2
Over Temperature
Over Temperature
Common-Mode Rejection Ratio
DC to 60 Hz with 1 kΩ Source Imbalance
G=1
G = 10
G = 100
G = 1000
OUTPUT
Output Swing
Over Temperature
V
S
= ±5 V to ±18 V
Over Temperature
Short Current Circuit
Rev. E | Page 3 of 16
AD622
Conditions
G = 1 + (50.5 k/R
G
)
V
OUT
= ±10 V
Min
1
Typ
Max
1000
Unit
0.05
0.2
0.2
0.2
V
OUT
= ±10 V
R
L
= 10 kΩ
R
L
= 2 kΩ
Gain = 1
Gain > 1
1
Total RTI Error = V
OSI
+ V
OSO
/G
V
S
= ±5 V to ±15 V
V
S
= ±5 V to ±15 V
V
S
= ±5 V to ±15 V
V
S
= ±5 V to ±15 V
V
S
= ±5 V to ±15 V
80
95
110
110
10
10
0.15
0.50
0.50
0.50
%
%
%
%
ppm
ppm
ppm/°C
ppm/°C
µV
µV/°C
µV
µV/°C
dB
dB
dB
dB
10
−50
60
600
125
1.0
1500
15
100
120
140
140
2.0
3.0
0.7
2.0
5.0
2.5
nA
pA/°C
nA
pA/°C
10||2
10||2
V
S
= ±2.6 V to ±5 V
V
S
= ±5 V to ±18 V
V
CM
= 0 V to ±10 V
66
86
103
103
R
L
= 10 kΩ
V
S
= ±2.6 V to ±5 V
78
98
118
118
−V
S
+ 1.9
−V
S
+ 2.1
−V
S
+ 1.9
−V
S
+ 2.1
+V
S
– 1.2
+V
S
– 1.3
+V
S
– 1.4
+V
S
– 1.4
G Ω||pF
GΩ||pF
V
V
V
V
dB
dB
dB
dB
−V
S
+ 1.1
−V
S
+ 1.4
−V
S
+ 1.2
−V
S
+ 1.6
±18
+V
S
– 1.2
+V
S
– 1.3
+V
S
– 1.4
+V
S
– 1.5
V
V
V
V
mA
AD622
Parameter
DYNAMIC RESPONSE
Small Signal −3 dB Bandwidth
G=1
G = 10
G = 100
G = 1000
Slew Rate
Settling Time to 0.1%
G = 1 to 100
NOISE
Voltage Noise, 1 kHz
Input Voltage Noise, e
ni
Output Voltage Noise, e
no
RTI, 0.1 Hz to 10 Hz
G=1
G = 10
G = 100
Current Noise
0.1 Hz to 10 Hz
REFERENCE INPUT
R
IN
I
IN
Voltage Range
Gain to Output
POWER SUPPLY
Operating Range
3
Quiescent Current
Over Temperature
TEMPERATURE RANGE
For Specified Performance
1
2
Data Sheet
Conditions
Min
Typ
Max
Unit
1000
800
120
12
1.2
10 V step
10
Total RTI Noise = √(e
2ni
) + (e
no
∕G)2
12
72
4.0
0.6
0.3
100
10
20
50
−V
S
+ 1.6
1 ± 0.0015
±2.6
V
S
= ±2.6 V to ±18 V
0.9
1.1
−40 to +85
±18
1.3
1.5
kHz
kHz
kHz
kHz
V/µs
µs
nV/√Hz
nV/√Hz
µV p-p
µV p-p
µV p-p
fA/√Hz
pA p-p
kΩ
µA
V
f = 1 kHz
V
IN+
, V
REF
= 0
60
+V
S
– 1.6
V
mA
mA
°C
Does not include effects of External Resistor R
G
.
One input grounded, G = 1.
3
Defined as the same supply range that is used to specify PSR.
Rev. E | Page 4 of 16
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