LF412-N

SNOSBH7F – APRIL 1999 – REVISED SEPTEMBER 2014

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7 Detailed Description

7.1 Overview

The LF412 devices are low cost, high speed, JFET input operational amplifiers with very low input offset voltage

and input offset voltage drift. They require low supply current yet maintain a large gain bandwidth product and

fast slew rate. In addition, well matched high voltage JFET input devices provide very low input bias and offset

currents. The LF412-N dual is pin compatible with the LM1558, allowing designers to immediately upgrade the

overall performance of existing designs.

These amplifiers may be used in applications such as high speed integrators, fast D/A converters, sample and

hold circuits and many other circuits requiring low input offset voltage and drift, low input bias current, high input

impedance, high slew rate and wide bandwidth.

7.2 Functional Block Diagram

Figure 27. Each Amplifier

7.3 Feature Description

The amplifier's differential inputs consist of a non-inverting input (+IN) and an inverting input (-IN). The amplifier

amplifies only the difference in voltage between the two inputs, which is called the differential input voltage. The

output voltage of the op-amp VOUT is given by the equation VOUT = AOL(IN+ - IN-).

12

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