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LM308 데이터시트 PDF




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부품번호 LM308 기능
기능 Operational Amplifiers
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LM308 데이터시트, 핀배열, 회로
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 g2V to
g18V 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 mV sec 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 C to
a85 C temperature range instead of b55 C to a125 C
The LM308A devices have slightly-relaxed specifications
and performances over a 0 C to a70 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 mA even in saturation
Y Guaranteed 5 mV C drift
Compensation Circuits
Standard Compensation Circuit
Alternate Frequency Compensation
Cf
t
R1 CO
R1aR2
CO e 30 pF
TL H 7759 – 1
Bandwidth and slew rate are proportional to 1 Cf
Improves rejection of power supply
noise by a factor of ten
Bandwidth and slew rate are proportional to 1 Cs
Feedforward Compensation
TL H 7759 – 2
C1995 National Semiconductor Corporation TL H 7759
TL H 7759 – 3
RRD-B30M115 Printed in U S A




LM308 pdf, 반도체, 판매, 대치품
Typical Applications
Sample and Hold
Teflon polyethylene or polycarbonate dielectric capacitor
Worst case drift less than 2 5 mV sec
High Speed Amplifier with Low Drift and Low Input Current
TL H 7759 – 4
TL H 7759 – 5
4

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LM308 전자부품, 판매, 대치품
Physical Dimensions inches (millimeters) (Continued)
Ceramic Dual-In-Line Package (J)
Order Number LM108AJ-8 LM208AJ-8 or LM308AJ-8
NS Package Number J08A
S O Package (M)
Order Number LM308AM
NS Package Number M08A
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