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AD8229HDZ

更新时间： 2024-11-17 08:17:39
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亚德诺 - ADI 仪表放大器放大器电路PC
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24页 825K
描述
1nV/√Hz Low Noise 210°C Instrumentation Amplifier

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1nV/√Hz Low Noise  
210°C Instrumentation Amplifier  
AD8229  
FEATURES  
FUNCTIONAL BLOCK DIAGRAM  
Designed for 210°C operation  
Low noise  
1 nV/√Hz input noise  
45 nV/√Hz output noise  
High CMRR  
AD8229  
1
2
3
4
8
7
6
5
–IN  
+V  
S
R
R
V
OUT  
G
G
REF  
–V  
+IN  
S
126 dB CMRR (minimum), G = 100  
80 dB CMRR (minimum) to 5 kHz, G = 1  
Excellent ac specifications  
15 MHz bandwidth (G = 1)  
1.2 MHz bandwidth (G = 100)  
22 V/μs slew rate  
TOP VIEW  
(Not to Scale)  
Figure 1.  
100  
80  
60  
THD: 130 dB (1 kHz, G = 1)  
Versatile  
40  
20  
4 V to 17 V dual supply  
Gain set with single resistor (G = 1 to 1000)  
Temperature range: −40°C to +210°C  
0
–20  
–40  
–60  
–80  
–100  
APPLICATIONS  
Down-hole instrumentation  
Harsh environment data acquisition  
Exhaust gas measurements  
Vibration analysis  
–55 –35 –15  
5
25 45 65 85 105 125 145 165 185 205 225  
TEMPERATURE (°C)  
Figure 2. Typical Input Offset vs. Temperature (G = 100)  
GENERAL DESCRIPTION  
The AD8229 is one of the fastest instrumentation amplifiers  
available. Its current feedback architecture provides bandwidth  
that is quite high, even at high gains, for example, 1.2 MHz at  
G = 100. With the high bandwidth comes excellent distortion  
performance, allowing use in demanding applications such as  
vibration analysis.  
The AD8229 is an ultralow noise instrumentation amplifier  
designed for measuring small signals in the presence of large  
common-mode voltages and high temperatures.  
The AD8229 has been designed for high temperature operation.  
The process is dielectrically isolated to avoid leakage currents at  
high temperatures. The design architecture was chosen to  
compensate for the low VBE voltages at high temperatures. To  
enhance long term reliability, the wire bonding in the packaging  
is designed to avoid intermetallic absorption at high  
temperatures.  
Gain is set from 1 to 1000 with a single resistor. A reference pin  
allows the user to offset the output voltage. This feature is useful  
when interfacing with analog-to-digital converters.  
The AD8229 is available in an 8-pin ceramic DIP package.  
The AD8229 excels at distinguishing tiny signals. It delivers  
industry leading 1 nV/√Hz input noise performance. The  
AD8229’s high CMRR prevents unwanted signals from  
corrupting the acquisition. The CMRR increases as the gain  
increases, offering high rejection when it is most needed.  
Rev. 0  
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  
©2011 Analog Devices, Inc. All rights reserved.  
 
 
 
 
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