LM108

LM108 LM208 LM308 Operational Amplifiers December 1994 LM108 LM208 LM308 Operational Amplifiers General Description The LM108 series are precision operational amplifiers having specifications a factor of ten better than FET amplifiers over a b55 C to a 125 C temperature range The devices operate with supply voltages from g 2V to g 20V and have sufficient supply rejection to use unregulated 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 bypass capacitors unnecessary The low current error of the LM108 series makes possible many designs that are not practical with conventional amplifiers 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 using capacitors no larger than 1 mF The LM108 is guaranteed from b55 C to a 125 C the LM208 from b25 C to a 85 C and the LM308 from 0 C to a 70 C Features Y Y Y Y Maximum input bias current of 3 0 nA over temperature Offset current less than 400 pA over temperature Supply current of only 300 mA even in saturation Guaranteed drift characteristics Compensation Circuits Standard Compensation Circuit Alternate Frequency Compensation Cf t R1 CO R1 a R2 CO e 30 pF TL H 7758 – 1 TL H 7758 – 2 Bandwidth a...