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參數(shù)資料
| 型號： | LM208AJ-8 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運(yùn)算放大器 |
| 英文描述： | CAC 5C 5#16S PIN RECP BOX |
| 中文描述： | OP-AMP, 1000 uV OFFSET-MAX, 1 MHz BAND WIDTH, CDIP8 |
| 封裝： | CERAMIC, DIP-8 |
| 文件頁數(shù)： | 1/8頁 |
| 文件大小： | 158K |
| 代理商： | LM208AJ-8 |
TL/H/7759
L
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.
The devices operate with supply voltages from
g
2V to
g
18V and have sufficient supply rejection to use unregulat-
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.
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 M
X
source resistances,
introducing less error than devices like the 709 with 10 k
X
sources. Integrators with drifts less than 500
m
V/sec and
analog time delays in excess of one hour can be made us-
ing capacitors no larger than 1
m
F.
The LM208A is identical to the LM108A, except that the
LM208A has its performance guaranteed over a
b
25
§
C to
a
85
§
C temperature range, instead of
b
55
§
C to
a
125
§
C.
The LM308A devices have slightly-relaxed specifications
and performances over a 0
§
C to
a
70
§
C temperature range.
Features
Y
Offset voltage guaranteed less than 0.5 mV
Y
Maximum input bias current of 3.0 nA over temperature
Y
Offset current less than 400 pA over temperature
Y
Supply current of only 300
m
A, even in saturation
Y
Guaranteed 5
m
V/
§
C drift
Compensation Circuits
Standard Compensation Circuit
C
f
t
R1 C
O
R1
a
R2
C
O
e
30 pF
TL/H/7759–1
**
Bandwidth and slew rate are proportional to 1/C
f
.
**
Bandwidth and slew rate are proportional to 1/C
s
.
Alternate
*
Frequency Compensation
*
Improves rejection of power supply
noise by a factor of ten.
TL/H/7759–2
Feedforward Compensation
TL/H/7759–3
C
1995 National Semiconductor Corporation
RRD-B30M115/Printed in U. S. A.
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