LM108 National Semiconductor, LM108 Datasheet
LM108
Manufacturer Part Number
LM108
Description
Operational Amplifiers
Manufacturer
National Semiconductor
Datasheet
1.LM108.pdf
(10 pages)
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C 1995 National Semiconductor Corporation
LM108 LM208 LM308 Operational Amplifiers
General Description
The LM108 series are precision operational amplifiers hav-
ing specifications a factor of ten better than FET amplifiers
over a
The devices operate with supply voltages from
g
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 LM108 series makes possible
many designs that are not practical with conventional ampli-
fiers In fact it operates from 10 M
Compensation Circuits
Bandwidth and slew rate are proportional to 1 C
20V and have sufficient supply rejection to use unregulat-
b
55 C to
Standard Compensation Circuit
a
125 C temperature range
TL H 7758
C
C
source resistances
f t
O
f
e
R1
30 pF
R1 C
a
Feedforward Compensation
O
R2
TL H 7758– 1
g
2V to
introducing less error than devices like the 709 with 10 k
sources Integrators with drifts less than 500
analog time delays in excess of one hour can be made us-
ing capacitors no larger than 1 F
The LM108 is guaranteed from
LM208 from
Features
Y
Y
Y
Y
a
Bandwidth and slew rate are proportional to 1 C
Improves rejection of power supply noise by a factor of ten
70 C
Maximum input bias current of 3 0 nA over temperature
Offset current less than 400 pA over temperature
Supply current of only 300 A even in saturation
Guaranteed drift characteristics
Alternate Frequency Compensation
b
25 C to
a
85 C and the LM308 from 0 C to
TL H 7758 – 3
b
55 C to
RRD-B30M115 Printed in U S A
s
December 1994
a
125 C the
V sec and
TL H 7758 – 2
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