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AD8641_05

更新时间： 2024-02-01 00:19:38
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亚德诺 - ADI 放大器
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16页 502K
描述
Low Power, Rail-to-Rail Output Precision JFET Amplifier

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AD8641_05 数据手册

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Low Power, Rail-to-Rail Output  
Precision JFET Amplifier  
AD8641/AD8642/AD8643  
FEATURES  
PIN CONFIGURATIONS  
Low supply current: 250 µA max  
Very low input bias current: 1 pA max  
Low offset voltage: 750 µV max  
Single-supply operation: 5 V to 26 V  
Dual-supply operation: 2.5 V to 13 V  
Rail-to-rail output  
OUT  
VEE  
+IN  
1
2
3
5
4
VCC  
AD8641  
TOP VIEW  
(Not to Scale)  
–IN  
Figure 1. 5-Lead SC70 (KS-5)  
Unity-gain stable  
No phase reversal  
SC70 package  
NC  
–IN  
1
2
3
4
8
7
6
5
NC  
AD8641  
VCC  
OUT  
NC  
+IN  
TOP VIEW  
(Not to Scale)  
VEE  
APPLICATIONS  
NC = NO CONNECT  
Line-/battery-powered instruments  
Photodiode amplifiers  
Precision current sensing  
Medical instrumentation  
Industrial controls  
Precision filters  
Figure 2. 8-Lead SOIC (R-8)  
OUT A  
–IN A  
+IN A  
V–  
1
2
3
4
8
7
6
5
V+  
AD8642  
OUT B  
–IN B  
+IN B  
TOP VIEW  
(Not to Scale)  
Figure 3. 8-Lead SOIC (R-8)  
Portable audio  
ATE  
OUT A  
–IN A  
+IN A  
V–  
1
2
3
4
8
7
6
5
V+  
AD8642  
OUT B  
–IN B  
+IN B  
TOP VIEW  
(Not to Scale)  
GENERAL DESCRIPTION  
The AD8641/AD8642/AD8643 are low power, precision JFET  
input amplifiers featuring extremely low input bias current and  
rail-to-rail output. The ability to swing nearly rail-to-rail at the  
input and rail-to-rail at the output enables designers to buffer  
CMOS DACs, ASICs, and other wide output swing devices in  
single-supply systems. The outputs remain stable with  
capacitive loads of more than 500 pF.  
Figure 4. 8-Lead MSOP (RM-8)  
OUT A  
–IN A  
+IN A  
V+  
1
2
3
4
5
6
7
14 OUT D  
13 –IN D  
12 +IN D  
11 V–  
AD8643  
TOP VIEW  
(Not to Scale)  
+IN B  
–IN B  
OUT B  
10 +IN C  
9
8
–IN C  
OUT C  
The AD8641/AD8642/AD8643 are suitable for applications  
utilizing multichannel boards that require low power to manage  
heat. Other applications include photodiodes, ATE reference  
level drivers, battery management, and industrial controls.  
Figure 5. 14-Lead SOIC (R-14)  
The AD8641/AD8642/AD8643 are fully specified over the  
extended industrial temperature range of –40°C to +125°C. The  
AD8641 is available in 5-lead SC70 and 8-lead SOIC lead-free  
packages. The AD8642 is available in 8-lead MSOP and 8-lead  
SOIC lead-free packages. The AD8643 is available in 14-lead  
SOIC and 16-lead, 3 mm × 3 mm, LFCSP lead-free packages.  
12 –IN D  
11 +IN D  
10 V–  
–IN A  
+IN A  
V+  
1
2
3
4
PIN 1  
INDICATOR  
AD8643  
TOP VIEW  
+IN B  
9 +IN C  
NC = NO CONNECT  
Figure 6. 16-Lead LFCSP (CP-16) (Not Drawn to Scale)  
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 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: 781.461.3113  
www.analog.com  
©2005 Analog Devices, Inc. All rights reserved.  
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