Lm221/lm321 Precision Preamplifiers - National Semiconductor

The LM221 series are precision preamplifiers LM221 LM321 designed to operate with general purpose Operational Amplifiers to dras- tically 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 decreases the closed loop gain error. The LM221 series operates with supply voltages from g3V to g20V and has sufficient supply rejection to operate from unregulated supplies. The operating current is programma- ble from 5 mAto200 mA so bias current, offset current, gain and noise CAN be optimized for the particular application while still realizing very low drift. Super-gain Transistors are used for the input stage so input error currents are lower than conventional Amplifiers at the same operating current. Further, the initial offset voltage is easily nulled to zero. The extremely low drift of the LM221 will improve accuracy on almost any precision dc circuit. For example, instrumen- tation Amplifier strain gauge Amplifiers and thermocouple Amplifiers now using chopper Amplifiers CAN be made with the LM221. The full differential input and high common- mode rejection are another advantage over choppers. For applications where low bias current is more important than drift, the operating current CAN be reduced to low values. High operating currents CAN be used for low voltage noise with low source resistance. The programmable operating current of the LM221 allows tailoring the input characteris- tics to match those of specialized op amps The LM221 is specified over a b25Cto a85C range and the LM321 over a 0Cto a70C temperature range. By National Semiconductor Corporation
LM221 's PackagesLM221 's pdf datasheet

LM221 Pinout, Pinouts
LM221 pinout,Pin out
This is one package pinout of LM221,If you need more pinouts please download LM221's pdf datasheet.

LM221 Application circuits
LM221 circuits
This is one application circuit of LM221,If you need more circuits,please download LM221's pdf datasheet.

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