LM221 Datasheet - National Semiconductor

LM221 LM221/LM321 Precision Preamplifiers

The LM221 series are precision preamplifiers designed to operate with general purpose operational amplifiers to drastically decrease dc errors Drift bias current common mode and supply rejection are more than a factor of 50 better than standard op amps alone Further the added dc gain of the LM221 de.

LM221 Features

* Y Y Y Y Y Y Y Guaranteed drift of LM321A 0 2 mV C Guaranteed drift of LM221 series 1 mV C Offset voltage less than 0 4 mV Bias current less than 10 nA at 10 mA operating current CMRR 126 dB minimum 120 dB supply rejection Easily nulled offset voltage Typical Applications Thermocouple Amplifier wit

LM221_NationalSemiconductor.pdf