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Analog Devices Semiconductor Electronic Components Datasheet

AD620 Datasheet

Low Power Instrumentation Amplifier

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AD620 pdf
a
Low Cost, Low Power
Instrumentation Amplifier
FEATURES
EASY TO USE
Gain Set with One External Resistor
(Gain Range 1 to 1000)
Wide Power Supply Range (؎2.3 V to ؎18 V)
Higher Performance than Three 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 V max, Input Offset Voltage
0.6 V/؇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 V p-p Noise (0.1 Hz to 10 Hz)
EXCELLENT AC SPECIFICATIONS
120 kHz Bandwidth (G = 100)
15 s Settling Time to 0.01%
APPLICATIONS
Weigh Scales
ECG and Medical Instrumentation
Transducer Interface
Data Acquisition Systems
Industrial Process Controls
Battery Powered and Portable Equipment
PRODUCT DESCRIPTION
The AD620 is a low cost, high accuracy instrumentation ampli-
fier that requires only one external resistor to set gains of 1 to
AD620
CONNECTION DIAGRAM
8-Lead Plastic Mini-DIP (N), Cerdip (Q)
and SOIC (R) Packages
RG 1
–IN 2
+IN 3
–VS 4
AD620
TOP VIEW
8 RG
7 +VS
6 OUTPUT
5 REF
1000. 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. Fur-
thermore, 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,
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.
30,000
10,000
25,000
20,000
15,000
10,000
5,000
AD620A
RG
3 OP-AMP
IN-AMP
(3 OP-07s)
1,000
100
10
1
TYPICAL STANDARD
BIPOLAR INPUT
IN-AMP
G = 100
AD620 SUPERETA
BIPOLAR INPUT
IN-AMP
0
0 5 10 15 20
SUPPLY CURRENT – mA
Figure 1. Three Op Amp IA Designs vs. AD620
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
0.1
1k
10k 100k 1M
10M
SOURCE RESISTANCE –
100M
Figure 2. Total Voltage Noise vs. Source Resistance
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1999


Analog Devices Semiconductor Electronic Components Datasheet

AD620 Datasheet

Low Power Instrumentation Amplifier

No Preview Available !

AD620 pdf
AD620–SPECIFICATIONS (Typical @ +25؇C, VS = ؎15 V, and RL = 2 k, unless otherwise noted)
Model
Conditions
AD620A
Min Typ Max
AD620B
Min Typ Max
AD620S1
Min Typ Max
Units
GAIN
Gain Range
Gain Error2
G=1
G = 10
G = 100
G = 1000
Nonlinearity,
G = 1–1000
G = 1–100
Gain vs. Temperature
G = 1 + (49.4 k/RG)
VOUT = ± 10 V
VOUT = –10 V to +10 V,
RL = 10 k
RL = 2 k
G =1
Gain >12
1
10,000
0.03 0.10
0.15 0.30
0.15 0.30
0.40 0.70
10 40
10 95
10
–50
1
10,000
0.01 0.02
0.10 0.15
0.10 0.15
0.35 0.50
10 40
10 95
10
–50
1
10,000
0.03 0.10
0.15 0.30
0.15 0.30
0.40 0.70
10 40
10 95
10
–50
%
%
%
%
ppm
ppm
ppm/°C
ppm/°C
VOLTAGE OFFSET
Input Offset, VOSI
Over Temperature
Average TC
Output Offset, VOSO
Over Temperature
Average TC
Offset Referred to the
Input vs.
Supply (PSR)
G=1
G = 10
G = 100
G = 1000
(Total RTI Error = VOSI + VOSO/G)
VS = ± 5 V to ± 15 V
VS = ± 5 V to ± 15 V
VS = ± 5 V to ± 15 V
VS = ± 15 V
VS = ± 5 V
VS = ± 5 V to ± 15 V
VS = ± 5 V to ± 15 V
VS = ± 2.3 V to ± 18 V
80
95
110
110
30 125
185
0.3 1.0
400 1000
1500
2000
5.0 15
100
120
140
140
15 50
85
0.1 0.6
200 500
750
1000
2.5 7.0
80 100
100 120
120 140
120 140
30 125
225
0.3 1.0
400 1000
1500
2000
5.0 15
µV
µV
µV/°C
µV
µV
µV
µV/°C
80 100
95 120
110 140
110 140
dB
dB
dB
dB
INPUT CURRENT
Input Bias Current
Over Temperature
Average TC
Input Offset Current
Over Temperature
Average TC
0.5 2.0
2.5
3.0
0.3 1.0
1.5
1.5
0.5 1.0
1.5
3.0
0.3 0.5
0.75
1.5
0.5 2
4
8.0
0.3 1.0
2.0
8.0
nA
nA
pA/°C
nA
nA
pA/°C
INPUT
Input Impedance
Differential
Common-Mode
Input Voltage Range3
Over Temperature
Over Temperature
Common-Mode Rejection
Ratio DC to 60 Hz with
I kSource Imbalance
G=1
G = 10
G = 100
G = 1000
VS = ± 2.3 V to ± 5 V
VS = ± 5 V to ± 18 V
VCM = 0 V to ± 10 V
–VS + 1.9
–VS + 2.1
–VS + 1.9
–VS + 2.1
10ʈ2
10ʈ2
+VS – 1.2
+VS – 1.3
+VS – 1.4
+VS – 1.4
–VS + 1.9
–VS + 2.1
–VS + 1.9
–VS + 2.1
10ʈ2
10ʈ2
+VS – 1.2
+VS – 1.3
+VS – 1.4
+VS – 1.4
–VS + 1.9
–VS + 2.1
–VS + 1.9
–VS + 2.3
10ʈ2
10ʈ2
+VS – 1.2
+VS – 1.3
+VS – 1.4
+VS – 1.4
GʈpF
GʈpF
V
V
V
V
73 90
93 110
110 130
110 130
80 90
100 110
120 130
120 130
73 90
93 110
110 130
110 130
dB
dB
dB
dB
OUTPUT
Output Swing
Over Temperature
Over Temperature
Short Current Circuit
RL = 10 k,
VS = ± 2.3 V to ± 5 V
VS = ± 5 V to ± 18 V
–VS + 1.1
–VS + 1.4
–VS + 1.2
–VS + 1.6
± 18
+VS – 1.2
+VS – 1.3
+VS – 1.4
+VS – 1.5
–VS + 1.1
–VS + 1.4
–VS + 1.2
–VS + 1.6
± 18
+VS – 1.2
+VS – 1.3
+VS – 1.4
+VS – 1.5
–VS + 1.1
–VS + 1.6
–VS + 1.2
–VS + 2.3
± 18
+VS – 1.2
+VS – 1.3
+VS – 1.4
+VS – 1.5
V
V
V
V
mA
–2– REV. E


Part Number AD620
Description Low Power Instrumentation Amplifier
Maker Analog Devices
Total Page 16 Pages
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