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AD8231-EVALZ

更新时间： 2024-11-18 08:17:39
品牌 Logo 应用领域
亚德诺 - ADI 仪表放大器
页数 文件大小 规格书
24页 675K
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Zero Drift, Digitally Programmable Instrumentation Amplifier

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AD8231-EVALZ 数据手册

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Zero Drift, Digitally Programmable  
Instrumentation Amplifier  
AD8231  
FUNCTIONAL BLOCK DIAGRAM  
FEATURES  
Digitally/pin-programmable gain  
G = 1, 2, 4, 8, 16, 32, 64, or 128  
Specified from −40°C to +125°C  
50 nV/°C maximum input offset drift  
10 ppm/°C maximum gain drift  
Excellent dc performance  
80 dB minimum CMR, G = 1  
15 μV maximum input offset voltage  
500 pA maximum bias current  
0.7 μV p-p noise (0.1 Hz to 10 Hz)  
Good ac performance  
1
2
3
4
12  
11  
10  
9
NC  
–INA  
+INA  
NC  
+V  
–V  
S
LOGIC  
S
IN-AMP  
OUTA  
REF  
OP  
AMP  
AD8231  
2.7 MHz bandwidth, G = 1  
1.1 V/ꢀs slew rate  
Rail-to-rail output  
Shutdown/multiplex  
Figure 1.  
Extra op amp  
Single-supply range: 3 V to 6 V  
Dual-supply range: 1.5 V to 3 V  
Table 1. Instrumentation and Difference Amplifiers by  
Category  
High  
Low  
Cost  
High  
Voltage  
Mil  
Grade  
Low  
Power  
Digital  
Gain  
Performance  
AD8221  
AD82201  
AD8222  
AD82241  
AD6231  
AD85531  
AD628  
AD629  
AD620  
AD621  
AD524  
AD526  
AD624  
AD6271  
AD82311  
AD8250  
AD8251  
AD85551  
AD85561  
AD85571  
APPLICATIONS  
Pressure and strain transducers  
Thermocouples and RTDs  
Programmable instrumentation  
Industrial controls  
Weigh scales  
1 Rail-to-rail output.  
GENERAL DESCRIPTION  
The AD8231 also includes an uncommitted op amp that can be  
used for additional gain, differential signal driving, or filtering.  
Like the in-amp, the op amp has an auto-zero architecture, rail-  
to-rail input, and rail-to-rail output.  
The AD8231 is a low drift, rail-to-rail, instrumentation amplifier  
with software-programmable gains of 1, 2, 4, 8, 16, 32, 64, or 128.  
The gains are programmed via digital logic or pin strapping.  
The AD8231 is ideal for applications that require precision  
performance over a wide temperature range, such as industrial  
temperature sensing and data logging. Because the gain setting  
resistors are internal, maximum gain drift is only 10 ppm/°C for  
gains of 1 to 32. Because of the auto-zero input stage, maximum  
input offset is 15 μV and maximum input offset drift is just  
50 nV/°C. CMRR is 80 dB for G = 1, increasing to 110 dB at  
higher gains.  
The AD8231 includes a shutdown feature that reduces current  
to a maximum of 1 μA. In shutdown, both amplifiers also have  
a high output impedance, which allows easy multiplexing of  
multiple amplifiers without additional switches.  
The AD8231 is specified over the extended industrial tempera-  
ture range of −40°C to +125°C. It is available in a 4 mm × 4 mm  
16-lead LFCSP.  
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 registeredtrademarks arethe property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
Fax: 781.461.3113  
www.analog.com  
©2007 Analog Devices, Inc. All rights reserved.  
 
 
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