LM101A/LM201A/LM301A

Operational Amplifiers

General Description

The LM101A series are general purpose operational ampli-

fiers which feature improved performance over industry stan-

dards like the LM709. Advanced processing techniques

make possible an order of magnitude reduction in input

currents, and a redesign of the biasing circuitry reduces the

temperature drift of input current. Improved specifications

include:

•

Offset voltage 3 mV maximum over temperature

(LM101A/LM201A)

•

Input current 100 nA maximum over temperature

(LM101A/LM201A)

•

Offset current 20 nA maximum over temperature

(LM101A/LM201A)

•

Guaranteed drift characteristics

•

Offsets guaranteed over entire common mode and sup-

ply voltage ranges

•

Slew rate of 10V/µs as a summing amplifier

This amplifier offers many features which make its appli-

cation nearly foolproof: overload protection on the input

and output, no latch-up when the common mode range is

exceeded, and freedom from oscillations and compensa-

tion with a single 30 pF capacitor. It has advantages over

internally compensated amplifiers in that the frequency

compensation can be tailored to the particular applica-

tion. For example, in low frequency circuits it can be

overcompensated for increased stability margin. Or the

compensation can be optimized to give more than a

factor of ten improvement in high frequency performance

for most applications.

In addition, the device provides better accuracy and

lower noise in high impedance circuitry. The low input

currents also make it particularly well suited for long

interval integrators or timers, sample and hold circuits

and low frequency waveform generators. Further, replac-

ing circuits where matched transistor pairs buffer the

inputs of conventional IC op amps, it can give lower offset

voltage and a drift at a lower cost.

The LM101A is guaranteed over a temperature range of

−55˚C to +125˚C, the LM201A from −25˚C to +85˚C, and

the LM301A from 0˚C to +70˚C.

Fast AC/DC Converter

00775233

Note 1: Feedforward compensation can be used to make a fast full wave rectifier without a filter.

August 2000

© 2004 National Semiconductor Corporation

DS007752

www.national.com