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
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©1996–2012 Analog Devices, Inc. All rights reserved.
IMPORTANT LINKS for the
AD622*
Last content update 09/09/2013 12:42 am
PARAMETRIC SELECTION TABLES
Find Similar Products By Operating Parameters
AN-282:
Fundamentals of Sampled Data Systems
AN-244:
A User’s Guide to I.C. Instrumentation Amplifiers
AN-245:
Instrumentation Amplifiers Solve Unusual Design Problems
AN-671:
Reducing RFI Rectification Errors in In-Amp Circuits
AN-589:
Ways to Optimize the Performance of a Difference Amplifier
A Designer’s Guide to Instrumentation Amplifiers (3rd Edition)
UG-261:
Evaluation Boards for the AD62x, AD822x and AD842x Series
Auto-Zero Amplifiers
High-performance Adder Uses Instrumentation Amplifiers
Input Filter Prevents Instrumentation-amp RF-Rectification Errors
The AD8221 - Setting a New Industry Standard for Instrumentation
Amplifiers
Applying Instrumentation Amplifiers Effectively: The Importance of an
Input Ground Return
Leading Inside Advertorials: Applying Instrumentation Amplifiers
Effectively—The Importance of an Input Ground Return
DESIGN COLLABORATION COMMUNITY
Collaborate Online
with the ADI support team and other designers
about select ADI products.
Follow us on Twitter:
www.twitter.com/ADI_News
Like us on Facebook:
www.facebook.com/AnalogDevicesInc
DESIGN SUPPORT
Submit your support request here:
Linear and Data Converters
Embedded Processing and DSP
Americas:
Europe:
China:
India:
Russia:
Telephone our Customer Interaction Centers toll free:
1-800-262-5643
00800-266-822-82
4006-100-006
1800-419-0108
8-800-555-45-90
Quality and Reliability
Lead(Pb)-Free Data
DESIGN TOOLS, MODELS, DRIVERS & SOFTWARE
In-Amp Error Calculator
SAMPLE & BUY
EVALUATION KITS & SYMBOLS & FOOTPRINTS
View the Evaluation Boards and Kits page for documentation and
purchasing
Symbols and Footprints
AD622
View Price & Packaging
Request Evaluation Board
Request Samples
Check Inventory & Purchase
Find Local Distributors
* This page was dynamically generated by Analog Devices, Inc. and inserted into this data sheet.
Note: Dynamic changes to the content on this page (labeled 'Important Links') does not
constitute a change to the revision number of the product data sheet.
This content may be frequently modified.
Powered by TCPDF (www.tcpdf.org)
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
电路观察室
