LM108

LM108 Description

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LM108 Datasheet (PDF)

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LM108 Features

• Maximum input bias current of 3.0 nA over temperature
• Offset current less than 400 pA over temperature
• Supply current of only 300 µA, even in saturation
• Guaranteed drift characteristics

LM108 Description

The LM108 series are precision operational amplifiers having specifications a factor of ten better than FET amplifiers over a -55°C to +125°C temperature range.

The devices operate with supply voltages from ±2V to ±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 M Ohm source resistances, introducing less error than devices like the 709 with 10 k Ohm sources. Integrators with drifts less than 500 µV/sec and analog time delays in excess of one hour can be made using capacitors no larger than 1 µF.

The LM108 is guaranteed from -55°C to +125°C, the LM208 from -25°C to +85°C, and the LM308 from 0°C to +70°C.

LM108 Parameters

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