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Low Cost Low Power
Instrumentation Amplifier
AD620
FEATURES
Easy to use
Gain set with one external resistor
(Gain range 1 to 10,000)
Wide power supply range (±2.3 V to ±18 V)
Higher performance than 3 op amp IA designs
Available in 8-lead DIP and SOIC packaging
Low power, 1.3 mA max supply current
Excellent dc performance (B grade)
50 µV max, input offset voltage
0.6 µV/°C max, input offset drift
1.0 nA max, input bias current
100 dB min common-mode rejection ratio (G = 10)
Low noise
9 nV/√Hz @ 1 kHz, input voltage noise
0.28 µV p-p noise (0.1 Hz to 10 Hz)
Excellent ac specifications
120 kHz bandwidth (G = 100)
15 µs settling time to 0.01%
CONNECTION DIAGRAM
R
G
–IN
+IN
–V
S
1
2
3
4
8
R
G
7 +V
S
6
OUTPUT
00775-0-001
AD620
TOP VIEW
5 REF
Figure 1. 8-Lead PDIP (N), CERDIP (Q), and SOIC (R) Packages
PRODUCT DESCRIPTION
The AD620 is a low cost, high accuracy instrumentation
amplifier that requires only one external resistor to set gains of
1 to 10,000. Furthermore, the AD620 features 8-lead SOIC and
DIP packaging that is smaller than discrete designs and offers
lower power (only 1.3 mA max supply current), making it a
good fit for battery-powered, portable (or remote) applications.
The AD620, with its high accuracy of 40 ppm maximum
nonlinearity, low offset voltage of 50 µV max, and offset drift of
0.6 µV/°C max, is ideal for use in precision data acquisition
systems, such as weigh scales and transducer interfaces.
Furthermore, the low noise, low input bias current, and low power
of the AD620 make it well suited for medical applications, such
as ECG and noninvasive blood pressure monitors.
The low input bias current of 1.0 nA max is made possible with
the use of Superϐeta processing in the input stage. The AD620
works well as a preamplifier due to its low input voltage noise of
9 nV/√Hz at 1 kHz, 0.28 µV p-p in the 0.1 Hz to 10 Hz band,
and 0.1 pA/√Hz input current noise. Also, the AD620 is well
suited for multiplexed applications with its settling time of 15 µs
to 0.01%, and its cost is low enough to enable designs with one
in-amp per channel.
10,000
APPLICATIONS
Weigh scales
ECG and medical instrumentation
Transducer interface
Data acquisition systems
Industrial process controls
Battery-powered and portable equipment
30,000
TOTAL ERROR, PPM OF FULL SCALE
25,000
3 OP AMP
IN-AMP
(3 OP-07s)
1,000
20,000
RTI VOLTAGE NOISE
(0.1 – 10Hz) (
µ
V p-p)
TYPICAL STANDARD
BIPOLAR INPUT
IN-AMP
100
G = 100
10
AD620 SUPER
β
ETA
BIPOLAR INPUT
IN-AMP
15,000
AD620A
10,000
R
G
5,000
00775-0-002
1
0
0
5
10
SUPPLY CURRENT (mA)
15
20
0.1
1k
10k
100k
1M
SOURCE RESISTANCE (
Ω
)
10M
100M
Figure 2. Three Op Amp IA Designs vs. AD620
Rev. G
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.
Figure 3. Total Voltage Noise vs. Source Resistance
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703
© 2004 Analog Devices, Inc. All rights reserved.
00775-0-003
AD620
TABLE OF CONTENTS
Specifications .....................................................................................3
Absolute Maximum Ratings ............................................................5
ESD Caution ..................................................................................5
Typical Performance Characteristics ..............................................7
Theory of Operation .......................................................................13
Gain Selection..............................................................................16
Input and Output Offset Voltage ..............................................16
Reference Terminal .....................................................................16
Input Protection ..........................................................................16
RF Interference............................................................................16
Common-Mode Rejection.........................................................17
Grounding....................................................................................17
Ground Returns for Input Bias Currents.................................18
Outline Dimensions........................................................................19
Ordering Guide ...........................................................................20
REVISION HISTORY
12/04—Rev. F to Rev. G
Updated Format.................................................................. Universal
Change to Features............................................................................1
Change to Product Description.......................................................1
Changes to Specifications.................................................................3
Added Metallization Photograph....................................................4
Replaced Figure 4-Figure 6 ..............................................................6
Replaced Figure 15 ............................................................................7
Replaced Figure 33 ..........................................................................10
Replaced Figure 34 and Figure 35.................................................10
Replaced Figure 37 ..........................................................................10
Changes to Table 3 ..........................................................................13
Changes to Figure 41 and Figure 42 .............................................14
Changes to Figure 43 ......................................................................15
Change to Figure 44 ........................................................................17
Changes to Input Protection section ............................................15
Deleted Figure 9...............................................................................15
Changes to RF Interference section ..............................................15
Edit to Ground Returns for Input Bias Currents section...........17
Added AD620CHIPS to Ordering Guide ....................................19
7/03—Data Sheet changed from REV. E to REV. F
Edit to FEATURES............................................................................1
Changes to SPECIFICATIONS .......................................................2
Removed AD620CHIPS from ORDERING GUIDE ...................4
Removed METALLIZATION PHOTOGRAPH...........................4
Replaced TPCs 1–3 ...........................................................................5
Replaced TPC 12 ...............................................................................6
Replaced TPC 30 ...............................................................................9
Replaced TPCs 31 and 32...............................................................10
Replaced Figure 4 ............................................................................10
Changes to Table I...........................................................................11
Changes to Figures 6 and 7 ............................................................12
Changes to Figure 8 ........................................................................13
Edited INPUT PROTECTION section........................................13
Added new Figure 9........................................................................13
Changes to RF INTERFACE section ............................................14
Edit to GROUND RETURNS FOR INPUT BIAS CURRENTS
section...............................................................................................15
Updated OUTLINE DIMENSIONS .............................................16
Rev. G | Page 2 of 20
AD620
SPECIFICATIONS
Typical @ 25°C, V
S
= ±15 V, and R
L
= 2 kΩ, unless otherwise noted.
Table 1.
AD620A
Parameter
GAIN
Gain Range
Gain Error
2
G=1
G = 10
G = 100
G = 1000
Nonlinearity
G = 1–1000
G = 1–100
Gain vs. Temperature
Conditions Min
G = 1 + (49.4 kΩ/R
G
)
1
V
OUT
= ±10 V
Typ
Max
10,000
0.03
0.15
0.15
0.40
V
OUT
= −10 V to +10 V
R
L
= 10 kΩ
R
L
= 2 kΩ
10
10
0.10
0.30
0.30
0.70
40
95
10
−50
125
185
1.0
1000
1500
2000
15
0.1
200
15
Min
1
0.01
0.10
0.10
0.35
10
10
AD620B
Typ
Max
10,000
0.02
0.15
0.15
0.50
40
95
10
−50
50
85
0.6
500
750
1000
7.0
0.3
400
30
Min
1
0.03
0.15
0.15
0.40
10
10
AD620S
1
Typ Max
10,000
0.10
0.30
0.30
0.70
40
95
10
−50
125
225
1.0
1000
1500
2000
15
%
%
%
%
ppm
ppm
ppm/°C
ppm/°C
µV
µV
µV/°C
µV
µV
µV
µV/°C
Unit
VOLTAGE OFFSET
Input Offset, V
OSI
Overtemperature
Average TC
Output Offset, V
OSO
Overtemperature
Average TC
Offset Referred to the
Input vs. Supply (PSR)
G=1
G = 10
G = 100
G = 1000
INPUT CURRENT
Input Bias Current
Overtemperature
Average TC
Input Offset Current
Overtemperature
Average TC
INPUT
Input Impedance
Differential
Common-Mode
Input Voltage Range
3
Overtemperature
G=1
Gain >1
2
(Total RTI Error = V
OSI
+ V
OSO
/G)
V
S
= ±5 V
30
to ± 15 V
V
S
= ±5 V
to ± 15 V
V
S
= ±5 V
0.3
to ± 15 V
V
S
= ±15 V
400
V
S
= ± 5 V
V
S
= ±5 V
to ± 15 V
V
S
= ±5 V
5.0
to ± 15 V
V
S
= ±2.3 V
to ±18 V
80
95
110
110
100
120
140
140
0.5
3.0
0.3
1.5
2.5
5.0
80
100
120
120
2.0
2.5
1.0
1.5
100
120
140
140
0.5
3.0
0.3
1.5
1.0
1.5
0.5
0.75
80
95
110
110
100
120
140
140
0.5
8.0
0.3
8.0
2
4
1.0
2.0
dB
dB
dB
dB
nA
nA
pA/°C
nA
nA
pA/°C
10||2
10||2
V
S
= ±2.3 V −V
S
+ 1.9
to ±5 V
−V
S
+ 2.1
V
S
= ± 5 V
−V
S
+ 1.9
to ±18 V
−V
S
+ 2.1
+V
S
− 1.2
+V
S
− 1.3
+V
S
− 1.4
+V
S
− 1.4
−V
S
+ 1.9
−V
S
+ 2.1
−V
S
+ 1.9
−V
S
+ 2.1
10||2
10||2
+V
S
− 1.2
+V
S
− 1.3
+V
S
− 1.4
+V
S
+ 2.1
−V
S
+ 1.9
−V
S
+ 2.1
−V
S
+ 1.9
−V
S
+ 2.3
10||2
10||2
+V
S
− 1.2
+V
S
− 1.3
+V
S
− 1.4
+V
S
− 1.4
GΩ_pF
GΩ_pF
V
V
V
V
Overtemperature
Rev. G | Page 3 of 20
AD620
AD620A
Parameter
Conditions Min
Typ Max
Common-Mode Rejection
Ratio DC to 60 Hz with
1 kΩ Source Imbalance V
CM
= 0 V to ± 10 V
G=1
73
90
G = 10
93
110
G = 100
110
130
G = 1000
110
130
OUTPUT
Output Swing
R
L
= 10 kΩ
V
S
= ±2.3 V −V
S
+
+V
S
− 1.2
to ± 5 V
1.1
Overtemperature
−V
S
+ 1.4
+V
S
− 1.3
V
S
= ±5 V
−V
S
+ 1.2
+V
S
− 1.4
to ± 18 V
Overtemperature
−V
S
+ 1.6
+V
S
– 1.5
Short Circuit Current
±18
DYNAMIC RESPONSE
Small Signal –3 dB Bandwidth
G=1
1000
G = 10
800
G = 100
120
G = 1000
12
Slew Rate
0.75
1.2
Settling Time to 0.01%
10 V Step
G = 1–100
15
G = 1000
150
NOISE
Voltage Noise, 1 kHz
Total RTI Noise
=
(
e
2
ni
)
+
(
e
/
G
)
2
no
AD620B
Min
Typ
Max
Min
AD620S
1
Typ Max
Unit
80
100
120
120
90
110
130
130
73
93
110
110
90
110
130
130
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
S
+ 1.1
−V
S
+ 1.6
−V
S
+ 1.2
–V
S
+ 2.3
±18
+V
S
− 1.2
+V
S
− 1.3
+V
S
− 1.4
+V
S
– 1.5
V
V
V
V
mA
0.75
1000
800
120
12
1.2
15
150
0.75
1000
800
120
12
1.2
15
150
kHz
kHz
kHz
kHz
V/µs
µs
µs
Input, Voltage Noise, e
ni
Output, Voltage Noise, e
no
9
72
3.0
0.55
0.28
100
10
20
50
−V
S
+ 1.6
1 ± 0.0001
±2.3
V
S
= ±2.3 V
to ±18 V
0.9
1.1
−40 to +85
13
100
9
72
3.0
0.55
0.28
100
10
20
50
−V
S
+ 1.6
1 ± 0.0001
±2.3
0.9
1.1
−40 to +85
13
100
6.0
0.8
0.4
9
72
3.0
0.55
0.28
100
10
20
50
−V
S
+ 1.6
1 ± 0.0001
±2.3
0.9
1.1
−55 to +125
13
100
6.0
0.8
0.4
nV/√Hz
nV/√Hz
µV p-p
µV p-p
µV p-p
fA/√Hz
pA p-p
kΩ
µA
V
RTI, 0.1 Hz to 10 Hz
G=1
G = 10
G = 100–1000
Current Noise
0.1 Hz to 10 Hz
REFERENCE INPUT
R
IN
I
IN
Voltage Range
Gain to Output
POWER SUPPLY
Operating Range
4
Quiescent Current
Overtemperature
TEMPERATURE RANGE
For Specified Performance
f = 1 kHz
V
IN+
, V
REF
= 0
60
+V
S
− 1.6
60
+V
S
− 1.6
60
+V
S
− 1.6
±18
1.3
1.6
±18
1.3
1.6
±18
1.3
1.6
V
mA
mA
°C
1
2
See Analog Devices military data sheet for 883B tested specifications.
Does not include effects of external resistor R
G
.
3
One input grounded. G = 1.
4
This is defined as the same supply range that is used to specify PSR.
Rev. G | Page 4 of 20
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