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AD820

更新时间： 2024-11-25 22:39:03
品牌 Logo 应用领域
亚德诺 - ADI 运算放大器
页数 文件大小 规格书
16页 240K
描述
Single Supply, Rail to Rail Low Power FET-Input Op Amp

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中文翻译

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AD820 数据手册

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Single Supply, Rail to Rail  
a
Low Power FET-Input Op Amp  
AD820  
CONNECTION DIAGRAMS  
FEATURES  
True Single Supply Operation  
Output Swings Rail-to-Rail  
8-Lead Plastic Mini-DIP  
8-Lead SOIC  
Input Voltage Range Extends Below Ground  
Single Supply Capability from +3 V to +36 V  
Dual Supply Capability from ؎1.5 V to ؎18 V  
Excellent Load Drive  
Capacitive Load Drive Up to 350 pF  
Minimum Output Current of 15 mA  
Excellent AC Performance for Low Power  
800 ␮A Max Quiescent Current  
Unity Gain Bandwidth: 1.8 MHz  
Slew Rate of 3.0 V/␮s  
NULL  
–IN  
1
2
8
7
NC  
+V  
AD820  
AD820  
NC  
–IN  
+IN  
1
2
3
8
7
6
NC  
+V  
S
S
+IN  
3
4
6
5
V
OUT  
V
OUT  
TOP VIEW  
(Not to Scale)  
–V  
S
TOP VIEW  
(Not to Scale)  
NULL  
–V  
S
4
5
NC  
NC = NO CONNECT  
allowing the AD820 to accommodate input signals below  
Excellent DC Performance  
ground in the single supply mode. Output voltage swing extends  
to within 10 mV of each rail providing the maximum output  
dynamic range.  
800 ␮V Max Input Offset Voltage  
1 ␮V/؇C Typ Offset Voltage Drift  
25 pA Max Input Bias Current  
Low Noise  
Offset voltage of 800 µV max, offset voltage drift of 1 µV/°C, typ  
input bias currents below 25 pA and low input voltage noise  
provide dc precision with source impedances up to a Gigaohm.  
1.8 MHz unity gain bandwidth, –93 dB THD at 10 kHz and  
3 V/µs slew rate are provided for a low supply current of  
800 µA. The AD820 drives up to 350 pF of direct capacitive  
load and provides a minimum output current of 15 mA. This  
allows the amplifier to handle a wide range of load conditions.  
This combination of ac and dc performance, plus the outstand-  
ing load drive capability, results in an exceptionally versatile  
amplifier for the single supply user.  
13 nV/√Hz @ 10 kHz  
APPLICATIONS  
Battery Powered Precision Instrumentation  
Photodiode Preamps  
Active Filters  
12- to 14-Bit Data Acquisition Systems  
Medical Instrumentation  
Low Power References and Regulators  
PRODUCT DESCRIPTION  
The AD820 is a precision, low power FET input op amp that  
can operate from a single supply of +3.0 V to 36 V, or dual  
supplies of ±1.5 V to ±18 V. It has true single supply capability  
with an input voltage range extending below the negative rail,  
The AD820 is available in three performance grades. The A and  
B grades are rated over the industrial temperature range of  
–40°C to +85°C. There is 3 V grade—the AD820A-3V, rated  
over the industrial temperature range.  
The AD820 is offered in two varieties of 8-lead package: plastic  
DIP, and surface mount (SOIC).  
50  
45  
40  
35  
30  
25  
20  
15  
10  
5
0
0
1
2
3
4
5
6
7
8
9
10  
INPUT BIAS CURRENT – pA  
Figure 2. Gain of +2 Amplifier; VS = +5, 0, VIN = 2.5 V Sine  
Centered at 1.25 Volts  
Figure 1. Typical Distribution of Input Bias Current  
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  
which may result from its use. No license is granted by implication or  
otherwise under any patent or patent rights of Analog Devices.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781/329-4700  
Fax: 781/326-8703  
World Wide Web Site: http://www.analog.com  
© Analog Devices, Inc., 1999  
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