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LM108A Arkusz danych(PDF) 1 Page - National Semiconductor (TI) |
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LM108A Arkusz danych(HTML) 1 Page - National Semiconductor (TI) |
1 / 8 page 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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