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AD8221BR

更新时间: 2024-11-02 22:39:03
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20页 1116K
描述
Precision Instrumentation Amplifier

AD8221BR 数据手册

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Precision Instrumentation Amplifier  
AD8221  
CONNECTION DIAGRAM  
FEATURES  
Available in space-saving MSOP package  
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  
1
2
3
4
8
7
6
5
+V  
–IN  
S
R
R
V
OUT  
G
G
REF  
–V  
+IN  
S
AD8221  
TOP VIEW  
Operational up to 125°C1  
EXCELLENT AC SPECIFICATONS  
80 dB min CMRR to 10 kHz ( G = 1)  
825 kHz –3 dB bandwidth (G = 1)  
2 V/µs slew rate  
Figure 1. SOIC and MSOP Connection Diagram  
LOW NOISE  
120  
110  
100  
90  
8 nV/√Hz, @ 1 kHz, max input voltage noise  
0.25 µV p-p input noise (0.1 Hz to 10 Hz)  
HIGH ACCURACY DC PERFORMANCE (AD8221BR)  
90 dB min CMRR (G = 1)  
25 µV max input offset voltage  
0.3 µV/°C max input offset drift  
0.4 nA max input bias current  
AD8221  
COMPETITOR 1  
80  
70  
APPLICATIONS  
Weigh scales  
60  
COMPETITOR 2  
Industrial process controls  
Bridge amplifiers  
50  
40  
Precision data acquisition systems  
Medical instrumentation  
Strain gages  
10  
100  
1k  
10k  
100k  
FREQUENCY (Hz)  
Figure 2. Typical CMRR vs. Frequency for G = 1  
Transducer interfaces  
GENERAL DESCRIPTION  
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.  
The AD8221 is a gain programmable, high performance instru-  
mentation amplifier that delivers the industrys highest CMRR  
over frequency. 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 low cost 8-lead SOIC and MSOP  
packages, both of which offer the industrys 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.  
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.  
1 See Typical Performance Curves for expected operation from 85°C to 125°C.  
Rev. A  
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 that may result from its 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 and  
registered trademarks 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  
Fax: 781.326.8703  
www.analog.com  
© 2003 Analog Devices, Inc. All rights reserved.  
 

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