LM108A National Semiconductor, LM108A Datasheet

LM108A

Manufacturer Part Number

LM108A

Description

Operational Amplifiers

Manufacturer

National Semiconductor

Datasheet

1.LM108A.pdf (8 pages)

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C 1995 National Semiconductor Corporation

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

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

Compensation Circuits

18V and have sufficient supply rejection to use unregulat-

Bandwidth and slew rate are proportional to 1 C

Standard Compensation Circuit

TL H 7759

source resistances

Feedforward Compensation

f t

TL H 7759– 1

R1 C

30 pF

2V to

Bandwidth and slew rate are proportional to 1 C

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 LM208A is identical to the LM108A except that the

LM208A has its performance guaranteed over a

The LM308A devices have slightly-relaxed specifications

and performances over a 0 C to

Features

Improves rejection of power supply

noise by a factor of ten

85 C temperature range instead of

Offset voltage guaranteed less than 0 5 mV

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 5 V C drift

Alternate Frequency Compensation

TL H 7759 – 3

70 C temperature range

RRD-B30M115 Printed in U S A

55 C to

V sec and

TL H 7759 – 2

May 1989

25 C to

125 C

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