General Description
The LM108 series are precision operational amplifiers having
specifications a factor of ten better than FET amplifiers
over a b55§C to a125§C temperature range.
The devices operate with supply voltages from g2V to
g20V 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 a125§C, the
LM208 from b25§C to a85§C, and the LM308 from 0§C to
a70§C.