Image AD620
型号: AD620
厂商: Analog Devices Inc Analog Devices Inc
分类: 半导体
描述: low cost, low power instrumentation amplifier
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Low Cost, Low Power  
Instrumentation Amplifier  
a
AD620  
CONNECTION DIAGRAM  
FEATURES  
EASY TO USE  
Gain Set with One External Resistor  
(Gain Range 1 to 1000)  
8-Lead Plastic Mini-DIP (N), Cerdip (Q)  
and SOIC (R) Packages  
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  
1
2
3
4
8
7
6
5
R
R
G
G
+V  
–IN  
+IN  
S
OUTPUT  
REF  
EXCELLENT DC PERFORMANCE (“B GRADE”)  
50 V max, Input Offset Voltage  
0.6 V/؇C max, Input Offset Drift  
–V  
S
AD620  
TOP VIEW  
1.0 nA max, Input Bias Current  
100 dB min Common-Mode Rejection Ratio (G = 10)  
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.  
LOW NOISE  
9 nV/Hz, @ 1 kHz, Input Voltage Noise  
0.28 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  
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.  
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  
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.  
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  
30,000  
10,000  
25,000  
20,000  
15,000  
10,000  
5,000  
0
3 OP-AMP  
IN-AMP  
1,000  
(3 OP-07s)  
TYPICAL STANDARD  
BIPOLAR INPUT  
IN-AMP  
100  
G = 100  
AD620A  
10  
R
G
AD620 SUPERETA  
BIPOLAR INPUT  
1
IN-AMP  
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