User manual Analog Devices AD620

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Low Cost, Low Power  
Instrumentation Amplifier  
a
AD620  
FEATURES  
CONNECTION DIAGRAM  
EASY TO USE  
Gain Set with One External Resistor  
8
-Lead Plastic Mini-DIP (N), Cerdip (Q)  
and SOIC (R) Packages  
(
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  
RG  
1
2
3
4
8
7
6
5
RG  
–IN  
+VS  
+
IN  
OUTPUT  
REF  
EXCELLENT DC PERFORMANCE (“B GRADE”)  
–VS  
AD620  
5
0
1
1
0 V max, Input Offset Voltage  
.6 V/
؇
C max, Input Offset Drift  
.0 nA max, Input Bias Current  
00 dB min Common-Mode Rejection Ratio (G = 10)  
TOP VIEW  
1
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.  
LOW NOISE  
9
0
nV/Hz, @ 1 kHz, Input Voltage Noise  
.28 V p-p Noise (0.1 Hz to 10 Hz)  
The AD620, with its high accuracy of 40 ppm maximum  
nonlinearity, low offset voltage of 50 µV max and offset drift of  
EXCELLENT AC SPECIFICATIONS  
1
1
20 kHz Bandwidth (G = 100)  
5 s Settling Time to 0.01%  
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.  
APPLICATIONS  
Weigh Scales  
ECG and Medical Instrumentation  
Transducer Interface  
Data Acquisition Systems  
Industrial Process Controls  
Battery Powered and Portable Equipment  
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
0
nV/Hzat 1 kHz, 0.28 µV p-p in the 0.1 Hz to 10 Hz band,  
.1 pA/Hzinput current noise. Also, the AD620 is well suited  
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  
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  
3
OP-AMP  
IN-AMP  
3 OP-07s)  
1,000  
(
TYPICAL STANDARD  
BIPOLAR INPUT  
IN-AMP  
2
0,000  
5,000  
100  
1
G = 100  
AD620A  
RG  
1
0
1
0,000  
AD620 SUPERETA  
BIPOLAR INPUT  
IN-AMP  
1
5
,000  
0
0.1  
1k  
0
5
10  
15  
20  
10k  
100k  
1M  
10M  
100M  
SUPPLY CURRENT – mA  
SOURCE RESISTANCE – ⍀  
Figure 1. Three Op Amp IA Designs vs. AD620  
Figure 2. Total Voltage Noise vs. Source Resistance  
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.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781/329-4700  
Fax: 781/326-8703  
World Wide Web Site: http://www.analog.com  
© Analog Devices, Inc., 1999  

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