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AD621BRZ

更新时间： 2024-11-07 12:54:27
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亚德诺 - ADI 仪表放大器放大器电路光电二极管
页数 文件大小 规格书
16页 502K
描述
Low Drift, Low Power Instrumentation Amplifier

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AD621BRZ 数据手册

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Low Drift, Low Power  
Instrumentation Amplifier  
a
AD621  
CONNECTION DIAGRAM  
8-Lead Plastic Mini-DIP (N), Cerdip (Q)  
and SOIC (R) Packages  
FEATURES  
EASY TO USE  
Pin-Strappable Gains of 10 and 100  
All Errors Specified for Total System Performance  
Higher Performance than Discrete In Amp Designs  
Available in 8-Lead DIP and SOIC  
Low Power, 1.3 mA Max Supply Current  
Wide Power Supply Range (؎2.3 V to ؎18 V)  
1
2
3
4
8
7
6
5
G = 10/100  
G = 10/100  
–IN  
+V  
S
AD621  
TOPVIEW  
+IN  
OUTPUT  
REF  
(Not to Scale)  
–V  
S
EXCELLENT DC PERFORMANCE  
0.15% Max, Total Gain Error  
gain drift errors are achieved by the use of internal gain setting  
resistors. Fixed gains of 10 and 100 can easily be set via external  
pin strapping. The AD621 is fully specified as a total system,  
therefore, simplifying the design process.  
؎5 ppm/؇C, Total Gain Drift  
125 ␮V Max, Total Offset Voltage  
1.0 ␮V/؇C Max, Offset Voltage Drift  
LOW NOISE  
9 nV/√Hz, @ 1 kHz, Input Voltage Noise  
For portable or remote applications, where power dissipation,  
size, and weight are critical, the AD621 features a very low  
supply current of 1.3 mA max and is packaged in a compact  
8-lead SOIC, 8-lead plastic DIP or 8-lead cerdip. The AD621  
also excels in applications requiring high total accuracy, such  
as precision data acquisition systems used in weigh scales and  
transducer interface circuits. Low maximum error specifications  
including nonlinearity of 10 ppm, gain drift of 5 ppm/°C, 50 µV  
offset voltage, and 0.6 µV/°C offset drift (“B” grade), make  
possible total system performance at a lower cost than has been  
previously achieved with discrete designs or with other mono-  
lithic instrumentation amplifiers.  
0.28 ␮V p-p Noise (0.1 Hz to 10 Hz)  
EXCELLENT AC SPECIFICATIONS  
800 kHz Bandwidth (G = 10), 200 kHz (G = 100)  
12 ␮s Settling Time to 0.01%  
APPLICATIONS  
Weigh Scales  
Transducer Interface and Data Acquisition Systems  
Industrial Process Controls  
Battery-Powered and Portable Equipment  
PRODUCT DESCRIPTION  
The AD621 is an easy to use, low cost, low power, high accu-  
racy instrumentation amplifier that is ideally suited for a wide  
range of applications. Its unique combination of high perfor-  
mance, small size and low power, outperforms discrete in amp  
implementations. High functionality, low gain errors, and low  
When operating from high source impedances, as in ECG and  
blood pressure monitors, the AD621 features the ideal combina-  
tion of low noise and low input bias currents. Voltage noise is  
specified as 9 nV/√Hz at 1 kHz and 0.28 µV p-p from 0.1 Hz to  
10 Hz. Input current noise is also extremely low at 0.1 pA/√Hz.  
The AD621 outperforms FET input devices with an input bias  
current specification of 1.5 nA max over the full industrial tem-  
perature range.  
30,000  
25,000  
3 OP AMP  
IN AMP  
10,000  
20,000  
15,000  
10,000  
5,000  
0
(3 OP 07S)  
1,000  
TYPICAL STANDARD  
BIPOLAR INPUT  
IN AMP  
AD621A  
100  
10  
AD621 SUPER␤ETA  
BIPOLAR INPUT  
0
5
10  
SUPPLY CURRENT – mA  
15  
20  
IN AMP  
1
Figure 1. Three Op Amp IA Designs vs. AD621  
0.1  
1k  
10k  
100k  
1M  
10M  
100M  
SOURCE RESISTANCE – ⍀  
Figure 2. Total Voltage Noise vs. Source Resistance  
REV. B  
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., 2001  
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AD621BRZ 替代型号

型号 品牌 替代类型 描述 数据表
AD621ARZ ADI

类似代替

 Low Drift, Low Power Instrumentation Amp with fixed gains of 10 and 100
AD621AR ADI

类似代替

 Low Drift, Low Power Instrumentation Amplifier

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