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LM308AMX-LM308J-8
Operational Amplifier
TL/H/7758
LM108/LM208/LM308
Operational
Amplifiers
December 1994
LM108/LM208/LM308 Operational Amplifiers
General Description
The LM108 seriesare precision operational amplifiers hav-
ing specificationsa factoroften better than FET amplifiers
overa b55§Cto a125§C temperature range.
The devices operate with supply voltages from g2Vto
g20Vand have sufficient supply rejectiontouse unregulat- supplies. Althoughthe circuitis interchangeablewithand
usesthe same compensationasthe LM101A,an alternate
compensation scheme canbe usedto makeit particularly
insensitiveto power supply noise andto make supplyby-
pass capacitors unnecessary.
Thelow current errorofthe LM108 series makes possible
many designsthatare notpracticalwith conventional ampli-
fiers.In fact,it operates from10 MX source resistances,
introducing less error than deviceslikethe709 with10kX
sources. Integrators with drifts less than 500 mV/sec and
analog time delaysin excessofone hourcanbe madeus-
ing capacitorsno larger than1mF.
The LM108is guaranteed from b55§Cto a125§C,the
LM208 from b25§Cto a85§C,andthe LM308 from 0§Cto
a70§C.
Features Maximum input bias currentof3.0nA over temperature Offset current less than400pA over temperature Supply currentof only300mA, evenin saturation Guaranteed drift characteristics
Compensation Circuits
Standard Compensation Circuit
Cft R1CO aR2e 30pF
TL/H/7758–1
**Bandwidthandslewrateare proportionalto1/Cf
Alternate* FrequencyCompensation
TL/H/7758–2
*Improves rejectionof power supply noisebya factor often.
**Bandwidthandslewrateare proportionalto1/Cs
Feedforward Compensation
TL/H/7758–3
C1995National SemiconductorCorporation RRD-B30M115/PrintedinU.S.A.
