Part # LM208A datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM108A LM208A LM308A Operational Amplifiers

Part Details:

LM108ALM208ALM308A May 1989 LM108A LM208A LM308A Operational Amplifiers General DescriptionThe LM108 LM108A series are precision operational ampli- introducing less error than devices like the 709 with 10 kX fiers having specifications about a factor of ten better than sources Integrators with drifts less than 500 mV sec and FET amplifiers over their operating temperature range In analog time delays in excess of one hour can be made us- addition to low input currents these devices have extremely ing capacitors no larger than 1 mF low offset voltage making it possible to eliminate offset ad- The LM208A is identical to the LM108A except that the justments in most cases and obtain performance ap- LM208A has its performance guaranteed over a b25 C to proaching chopper stabilized amplifiers a 85 C temperature range instead of b55 C to a125 C The devices operate with supply voltages from g2V to The LM308A devices have slightly-relaxed specifications g Operational 18V and have sufficient supply rejection to use unregulat- and performances over a 0 C to a70 C temperature range ed supplies Although the circuit is interchangeable with anduses the same compensation as the LM101A an alternate Features compensation scheme can be used to make it particularly Y Offset voltage guaranteed less than 0 5 mV insensitive to power supply noise and to make supply by- Y Maximum input bias current of 3 0 nA over temperature pass capacitors unnecessary Y Offset current less than 400 pA over temperature The low current error of the LM108A series makes possible Y Supply current of only 300 mA even in saturation many designs that are not practical with conventional ampli- Y Guaranteed 5 mV C drift fiers In fact it operates from 10 MX source resistances Amplifiers Compensation Circuits Standard Compensation Circuit Alternate Frequency Compensation R1 CO Cf t R1aR2 Improves rejection of power supply CO e 30 pF noise by a factor of ten TL H 7759 ­ 1 TL H 7759 ­ 2 Bandwidth and slew rate are proportional to 1 Cf Bandwidth and slew rate are proportional to 1 Cs Feedforward Compensation

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LM208A.pdf Datasheet