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AD627 Datasheet
Rail-to-Rail Instrumentation Amplifier

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Data Sheet
Micropower, Single- and Dual-Supply,
Rail-to-Rail Instrumentation Amplifier
AD627
FEATURES
Micropower, 85 μA maximum supply current
Wide power supply range (+2.2 V to ±18 V)
Easy to use
Gain set with one external resistor
Gain range 5 (no resistor) to 1000
Higher performance than discrete designs
Rail-to-rail output swing
High accuracy dc performance
0.03% typical gain accuracy (G = +5) (AD627A)
10 ppm/°C typical gain drift (G = +5)
125 μV maximum input offset voltage (AD627B dual supply)
200 μV maximum input offset voltage (AD627A dual supply)
1 μV/°C maximum input offset voltage drift (AD627B)
3 μV/°C maximum input offset voltage drift (AD627A)
10 nA maximum input bias current
Noise: 38 nV/√Hz RTI noise at 1 kHz (G = +100)
Excellent ac specifications
AD627A: 77 dB minimum CMRR (G = +5)
AD627B: 83 dB minimum CMRR (G = +5)
80 kHz bandwidth (G = +5)
135 μs settling time to 0.01% (G = +5, 5 V step)
APPLICATIONS
4 mA to 20 mA loop-powered applications
Low power medical instrumentation—ECG, EEG
Transducer interfacing
Thermocouple amplifiers
Industrial process controls
Low power data acquisition
Portable battery-powered instruments
GENERAL DESCRIPTION
The AD627 is an integrated, micropower instrumentation
amplifier that delivers rail-to-rail output swing on single and
dual (+2.2 V to ±18 V) supplies. The AD627 provides excellent
ac and dc specifications while operating at only 85 μA maximum.
The AD627 offers superior flexibility by allowing the user to set
the gain of the device with a single external resistor while con-
forming to the 8-lead industry-standard pinout configuration.
With no external resistor, the AD627 is configured for a gain of 5.
With an external resistor, it can be set to a gain of up to 1000.
A wide supply voltage range (+2.2 V to ±18 V) and micropower
current consumption make the AD627 a perfect fit for a wide
range of applications. Single-supply operation, low power
consumption, and rail-to-rail output swing make the AD627
Rev. E
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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.
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FUNCTIONAL BLOCK DIAGRAM
RG 1
AD627
8 RG
–IN 2
7 +VS
+IN 3
6 OUTPUT
–VS 4
5 REF
Figure 1. 8-Lead PDIP (N) and SOIC_N (R)
100
90
80
AD627
70
60
50
TRADITIONAL
40 LOW POWER
DISCRETE DESIGN
30
20
10
0
1 10 100 1k 10k
FREQUENCY (Hz)
Figure 2. CMRR vs. Frequency, ±5 VS, Gain = +5
ideal for battery-powered applications. Its rail-to-rail output
stage maximizes dynamic range when operating from low
supply voltages. Dual-supply operation (±15 V) and low power
consumption make the AD627 ideal for industrial applications,
including 4 mA to 20 mA loop-powered systems.
The AD627 does not compromise performance, unlike other
micropower instrumentation amplifiers. Low voltage offset,
offset drift, gain error, and gain drift minimize errors in the
system. The AD627 also minimizes errors over frequency by
providing excellent CMRR over frequency. Because the CMRR
remains high up to 200 Hz, line noise and line harmonics are
rejected.
The AD627 provides superior performance, uses less circuit
board area, and costs less than micropower discrete designs.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2007−2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com


AD627 Datasheet
Rail-to-Rail Instrumentation Amplifier

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AD627* Product Page Quick Links
Last Content Update: 11/01/2016
Comparable Parts
View a parametric search of comparable parts
Evaluation Kits
• AD62x, AD822x, AD842x Series InAmp Evaluation Board
Documentation
Application Notes
• AN-1401: Instrumentation Amplifier Common-Mode
Range: The Diamond Plot
• AN-244: A User's Guide to I.C. Instrumentation Amplifiers
• AN-245: Instrumentation Amplifiers Solve Unusual Design
Problems
• AN-282: Fundamentals of Sampled Data Systems
• AN-589: Ways to Optimize the Performance of a
Difference Amplifier
• AN-671: Reducing RFI Rectification Errors in In-Amp
Circuits
Data Sheet
• AD627: Micropower, Single and Dual Supply Rail-to-Rail
Instrumentation Amplifier Data Sheet
Technical Books
• A Designer's Guide to Instrumentation Amplifiers, 3rd
Edition, 2006
User Guides
• UG-261: Evaluation Boards for the AD62x, AD822x and
AD842x Series
Tools and Simulations
• In-Amp Error Calculator
• AD627A SPICE Macro-Model
Reference Materials
Technical Articles
• Auto-Zero Amplifiers
• High-performance Adder Uses Instrumentation Amplifiers
• Input Filter Prevents Instrumentation-amp RF-Rectification
Errors
• MS-2178: Discussion Between CareFusion and Analog
Devices: Optimizing Performance and Lowering Power in
an EEG Amplifer
• Protecting Instrumentation Amplifiers
• The AD8221 - Setting a New Industry Standard for
Instrumentation Amplifiers
Design Resources
• AD627 Material Declaration
• PCN-PDN Information
• Quality And Reliability
• Symbols and Footprints
Discussions
View all AD627 EngineerZone Discussions
Sample and Buy
Visit the product page to see pricing options
Technical Support
Submit a technical question or find your regional support
number
* This page was dynamically generated by Analog Devices, Inc. and inserted into this data sheet. Note: Dynamic changes to
the content on this page does not constitute a change to the revision number of the product data sheet. This content may be
frequently modified.


AD627 Datasheet
Rail-to-Rail Instrumentation Amplifier

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AD627
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Single Supply ................................................................................. 3
Dual Supply ................................................................................... 5
Dual and Single Supplies ............................................................. 6
Absolute Maximum Ratings............................................................ 7
ESD Caution.................................................................................. 7
Pin Configurations and Function Descriptions ........................... 8
Typical Performance Characteristics ............................................. 9
Theory of Operation ...................................................................... 14
Using the AD627 ............................................................................ 15
Basic Connections ...................................................................... 15
Setting the Gain .......................................................................... 15
Data Sheet
Reference Terminal .................................................................... 16
Input Range Limitations in Single-Supply Applications....... 16
Output Buffering ........................................................................ 17
Input and Output Offset Errors................................................ 17
Make vs. Buy: A Typical Application Error Budget............... 18
Errors Due to AC CMRR .......................................................... 19
Ground Returns for Input Bias Currents ................................ 19
Layout and Grounding .............................................................. 20
Input Protection ......................................................................... 21
RF Interference ........................................................................... 21
Applications Circuits...................................................................... 22
Classic Bridge Circuit ................................................................ 22
4 mA to 20 mA Single-Supply Receiver .................................. 22
Thermocouple Amplifier .......................................................... 22
Outline Dimensions ....................................................................... 24
Ordering Guide .......................................................................... 24
REVISION HISTORY
12/13—Rev. D to Rev. E
Change to Voltage Noise, 1 kHz Parameter, Table 3 .................... 6
Changes to Figure 35...................................................................... 14
Change to Equation 3, Input Range Limitations in Single-
Supply Applications Section.......................................................... 16
Changes to Table 8.......................................................................... 17
Changes to Figure 40...................................................................... 17
Change to Table 9 ........................................................................... 18
Change to 4 mA to 20 mA Single-Supply Receiver Section ..... 22
11/07—Rev. C to Rev. D
Changes to Features.......................................................................... 1
Changes to Figure 29 to Figure 34 Captions ............................... 13
Changes to Setting the Gain Section............................................ 15
Changes to Input Range Limitations in Single-Supply
Applications Section....................................................................... 16
Changes to Table 7.......................................................................... 17
Changes to Figure 41...................................................................... 18
11/05—Rev. B to Rev. C
Updated Format..................................................................Universal
Added Pin Configurations and Function
Descriptions Section .........................................................................8
Change to Figure 33 ....................................................................... 13
Updated Outline Dimensions....................................................... 24
Changes to Ordering Guide .......................................................... 24
Rev. A to Rev. B
Changes to Figure 4 and Table I, Resulting Gain column......... 11
Change to Figure 9 ......................................................................... 13
Rev. E | Page 2 of 24


AD627 Datasheet
Rail-to-Rail Instrumentation Amplifier

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Data Sheet
AD627
SPECIFICATIONS
SINGLE SUPPLY
Typical at 25°C single supply, VS = 3 V and 5 V, and RL = 20 kΩ, unless otherwise noted.
Table 1.
Parameter
GAIN
Gain Range
Gain Error1
G = +5
G = +10
G = +100
G = +1000
Nonlinearity
G = +5
G = +100
Gain vs. Temperature1
G = +5
G > +5
VOLTAGE OFFSET
Input Offset, VOSI2
Over Temperature
Average TC
Output Offset, VOSO
Over Temperature
Average TC
Offset Referred to the
Input vs. Supply (PSRR)
G = +5
G = +10
G = +100
G = +1000
INPUT CURRENT
Input Bias Current
Over Temperature
Average TC
Input Offset Current
Over Temperature
Average TC
INPUT
Input Impedance
Differential
Common-Mode
Input Voltage Range3
Common-Mode Rejection
Ratio3 DC to 60 Hz with
1 kΩ Source Imbalance
G = +5
G = +5
OUTPUT
Output Swing
Short-Circuit Current
Conditions
G = +5 + (200 kΩ/RG)
VOUT = (−VS) + 0.1 to (+VS) − 0.15
VCM = VREF = +VS/2
VS = 2.2 V to 36 V
VREF = VS/2
VS = 3 V, VCM = 0 V to 1.9 V
VS = 5 V, VCM = 0 V to 3.7 V
RL = 20 kΩ
RL = 100 kΩ
Short circuit to ground
AD627A
Min Typ
5
0.03
0.15
0.15
0.50
10
20
10
−75
50
0.1
2.5
86 100
100 120
110 125
110 125
3
20
0.3
1
(−VS) − 0.1
20||2
20||2
77 90
77 90
(−VS) + 25
(−VS) + 7
±25
AD627B
Max Min
Typ Max
Unit
1000
5
1000
V/V
0.10
0.01 0.06
%
0.35
0.10 0.25
%
0.35
0.10 0.25
%
0.70
0.25 0.35
%
100
10 100
ppm
100
20 100
ppm
20
10 20
ppm/°C
−75 ppm/°C
250
445
3
1000
1650
10
25 150
215
0.1 1
500
1150
2.5 10
µV
µV
µV/°C
µV
µV
µV/°C
86
100
110
110
10
15
1
2
100
120
125
125
3 10
15
20
0.3 1
2
1
dB
dB
dB
dB
nA
nA
pA/°C
nA
nA
pA/°C
(+VS) − 1
(−VS) − 0.1
20||2
20||2
(+VS) – 1
GΩ||pF
GΩ||pF
V
83 96
83 96
dB
dB
(+VS) − 70 (−VS) + 25
(+VS) − 25 (−VS) + 7
(+VS) − 70 mV
(+VS) − 25 mV
±25 mA
Rev. E | Page 3 of 24


AD627 Datasheet
Rail-to-Rail Instrumentation Amplifier

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AD627
Data Sheet
Parameter
DYNAMIC RESPONSE
Small Signal −3 dB
Bandwidth
G = +5
G = +100
G = +1000
Slew Rate
Settling Time to 0.01%
G = +5
G = +100
Settling Time to 0.01%
G = +5
G = +100
Overload Recovery
Conditions
VS = 3 V, 1.5 V output step
VS = 5 V, 2.5 V output step
50% input overload
Min
AD627A
Typ
Max
80
3
0.4
+0.05/−0.07
65
290
85
330
3
AD627B
Min Typ Max
+0.05/−0.07
80
3
0.4
65
290
85
330
3
1 Does not include effects of External Resistor RG.
2 See Table 8 for total RTI errors.
3 See the Using the AD627 section for more information on the input range, gain range, and common-mode range.
Unit
kHz
kHz
kHz
V/µs
µs
µs
µs
µs
µs
Rev. E | Page 4 of 24


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