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LM208A

更新时间： 2024-11-11 22:31:11
品牌 Logo 应用领域
美国国家半导体 - NSC 运算放大器
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8页 160K
描述
Operational Amplifiers

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中文翻译

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LM208A 数据手册

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May 1989  
LM108A/LM208A/LM308A Operational Amplifiers  
General Description  
The LM108/LM108A series are precision operational ampli-  
fiers having specifications about a factor of ten better than  
FET amplifiers over their operating temperature range. In  
addition to low input currents, these devices have extremely  
low offset voltage, making it possible to eliminate offset ad-  
justments, in most cases, and obtain performance ap-  
proaching chopper stabilized amplifiers.  
introducing less error than devices like the 709 with 10 kX  
sources. Integrators with drifts less than 500 mV/sec and  
analog time delays in excess of one hour can be made us-  
ing capacitors no larger than 1 mF.  
The LM208A is identical to the LM108A, except that the  
b
LM208A has its performance guaranteed over a 25 C to  
§
85 C temperature range, instead of 55 C to 125 C.  
a
b
a
The LM308A devices have slightly-relaxed specifications  
§
§
§
g
18V and have sufficient supply rejection to use unregulat-  
The devices operate with supply voltages from  
g
2V to  
a
and performances over a 0 C to 70 C temperature range.  
§
§
ed supplies. Although the circuit is interchangeable with and  
uses the same compensation as the LM101A, an alternate  
compensation scheme can be used to make it particularly  
insensitive to power supply noise and to make supply by-  
pass capacitors unnecessary.  
Features  
Y
Offset voltage guaranteed less than 0.5 mV  
Y
Y
Y
Y
Maximum input bias current of 3.0 nA over temperature  
Offset current less than 400 pA over temperature  
Supply current of only 300 mA, even in saturation  
The low current error of the LM108A series makes possible  
many designs that are not practical with conventional ampli-  
fiers. In fact, it operates from 10 MX source resistances,  
Guaranteed 5 mV/ C drift  
§
Compensation Circuits  
Standard Compensation Circuit  
Alternate* Frequency Compensation  
R1 C  
O
a
R1 R2  
*Improve
noise b
30 pF  
TL/H/7759–1  
.
TL/H/7759–2  
**Bandwidth and slew rate are proportional to 1/C  
f
**Bandwidth and slew rate are proportional to 1/C  
.
s
Feedforward Compensation  
TL/H/7759–3  
C
1995 National Semiconductor Corporation  
TL/H/7759  
RRD-B30M115/Printed in U. S. A.  
12345678

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