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LM108AH Fiches technique(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No de pièce LM108AH
Description  Operational Amplifiers
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM108AH Fiches technique(HTML) 1 Page - National Semiconductor (TI)

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TLH7759
May 1989
LM108ALM208ALM308A Operational Amplifiers
General Description
The LM108LM108A 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 g2V 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 MX source resistances
introducing less error than devices like the 709 with 10 kX
sources Integrators with drifts less than 500 mVsec 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
LM208A has its performance guaranteed over a b25 Cto
a
85 C temperature range instead of b55 Cto a125 C
The LM308A devices have slightly-relaxed specifications
and performances over a 0 Cto a70 C temperature range
Features
Y
Offset voltage guaranteed less than 05 mV
Y
Maximum input bias current of 30 nA over temperature
Y
Offset current less than 400 pA over temperature
Y
Supply current of only 300 mA even in saturation
Y
Guaranteed 5 mV C drift
Compensation Circuits
Standard Compensation Circuit
Cf t
R1 CO
R1aR2
CO e 30 pF
TLH7759 – 1
Bandwidth and slew rate are proportional to 1Cf
Bandwidth and slew rate are proportional to 1Cs
Alternate Frequency Compensation
Improves rejection of power supply
noise by a factor of ten
TLH7759 – 2
Feedforward Compensation
TLH7759 – 3
C1995 National Semiconductor Corporation
RRD-B30M115Printed in U S A


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