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AD8221AC-P7 PDF预览

AD8221AC-P7

更新时间： 2024-11-21 12:32:59
品牌 Logo 应用领域
亚德诺 - ADI 仪表放大器
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24页 512K
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Precision Instrumentation Amplifier

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AD8221AC-P7 数据手册

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Precision Instrumentation Amplifier  
AD8221  
CONNECTION DIAGRAM  
FEATURES  
Easy to use  
1
2
3
4
8
7
6
5
+V  
V
–IN  
S
Available in space-saving MSOP  
Gain set with 1 external resistor (gain range 1 to 1000)  
Wide power supply range: 2.3 V to 18 V  
Temperature range for specified performance:  
−40°C to +85°C  
R
G
OUT  
R
REF  
–V  
G
+IN  
S
AD8221  
TOP VIEW  
Operational up to 125°C1  
Figure 1.  
120  
110  
100  
90  
Excellent AC specifications  
80 dB minimum CMRR to 10 kHz (G = 1)  
825 kHz, –3 dB bandwidth (G = 1)  
2 V/µs slew rate  
AD8221  
Low noise  
8 nV/√Hz, @ 1 kHz, maximum input voltage noise  
0.25 µV p-p input noise (0.1 Hz to 10 Hz)  
High accuracy dc performance (AD8221BR)  
90 dB minimum CMRR (G = 1)  
25 µV maximum input offset voltage  
0.3 µV/°C maximum input offset drift  
0.4 nA maximum input bias current  
COMPETITOR 1  
80  
70  
60  
COMPETITOR 2  
50  
40  
10  
100  
1k  
FREQUENCY (Hz)  
10k  
100k  
APPLICATIONS  
Weigh scales  
Figure 2. Typical CMRR vs. Frequency for G = 1  
Industrial process controls  
Bridge amplifiers  
Precision data acquisition systems  
Medical instrumentation  
Strain gages  
Low voltage offset, low offset drift, low gain drift, high gain  
accuracy, and high CMRR make this part an excellent choice  
in applications that demand the best dc performance possible,  
such as bridge signal conditioning.  
Transducer interfaces  
Programmable gain affords the user design flexibility. A single  
resistor sets the gain from 1 to 1000. The AD8221 operates on  
both single and dual supplies and is well suited for applications  
where 10 V input voltages are encountered.  
GENERAL DESCRIPTION  
The AD8221 is a gain programmable, high performance  
instrumentation amplifier that delivers the industry’s highest  
CMRR over frequency in its class. The CMRR of instrumentation  
amplifiers on the market today falls off at 200 Hz. In contrast,  
the AD8221 maintains a minimum CMRR of 80 dB to 10 kHz  
for all grades at G = 1. High CMRR over frequency allows the  
AD8221 to reject wideband interference and line harmonics,  
greatly simplifying filter requirements. Possible applications  
include precision data acquisition, biomedical analysis, and  
aerospace instrumentation.  
The AD8221 is available in a low cost 8-lead SOIC and 8-lead  
MSOP, both of which offer the industry’s best performance. The  
MSOP requires half the board space of the SOIC, making it ideal  
for multichannel or space-constrained applications.  
Performance is specified over the entire industrial temperature  
range of −40°C to +85°C for all grades. Furthermore, the AD8221  
is operational from −40°C to +125°C1.  
1 See Typical Performance Characteristics for expected operation from  
85°C to 125°C.  
Rev. C  
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  
rightsof third parties that may result fromits 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 andregisteredtrademarks are the property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
www.analog.com  
Fax: 781.461.3113 ©2003–2011 Analog Devices, Inc. All rights reserved.  
 
 
 
 
 
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