LF442

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SNOSC03F – APRIL 1999 – REVISED OCTOBER 2014

7 Detailed Description

7.1 Overview

The LF442 dual low power operational amplifiers provide many of the same AC characteristics as the industry

standard LM1458 while greatly improving the DC characteristics of the LM1458. The amplifiers have the same

bandwidth, slew rate, and gain (10 k

Ω load) as the LM1458 and only draw one tenth the supply current of the

LM1458. In addition the well matched high voltage JFET input devices of the LF442 reduce the input bias and

offset currents by a factor of 10,000 over the LM1458. A combination of careful layout design and internal

trimming ensures very low input offset voltage and voltage drift. The LF442 also has a very low equivalent input

noise voltage for a low power amplifier.

The LF442 is pin compatible with the LM1458 allowing an immediate 10 times reduction in power drain in many

applications. The LF442 should be used where low power dissipation and good electrical characteristics are the

major considerations.

7.2 Functional Block Diagram

Figure 26. 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

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