TL084MFKB datasheet(25/78 Pages) TI2

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8 Applications and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

8.1 Application Information

The TL08x series of operational amplifiers can be used in countless applications. The few applications in this

section show principles used in all applications of these parts.

8.2 Typical Applications

8.2.1 Inverting Amplifier Application

A typical application for an operational amplifier in an inverting amplifier. This amplifier takes a positive voltage

on the input, and makes positive voltage as a negative voltage of the same magnitude. In the same manner,

amplifier also makes negative voltages positive.

Vsup+

VOUT

VIN

Vsup-

Figure 8-1. Schematic for Inverting Amplifier Application

8.2.1.1 Design Requirements

Choose the supply voltage higher than input and output ranges. For instance, this application scales a signal of

±0.5V to ±1.8V. Setting the supply at ±12V is sufficient to accommodate this application.

8.2.1.2 Detailed Design Procedure

Determine the gain required by the inverting amplifier:

AV = VOUTVIN

(1)

AV = 1.8−0.5 = −3.6

(2)

After the desired gain is determined, choose a value for RI or RF. Choosing a value in the kΩ range is desirable

because the amplifier circuit uses currents in the milliampere range. This example chooses 10kΩ for RI, which

means that 36kΩ is used for RF. RF value is determined by Equation 3.

AV =–RFRI

(3)

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TL081, TL081A, TL081B, TL081H

TL082, TL082A, TL082B, TL082H

TL084, TL084A, TL084B, TL084H

SLOS081O – FEBRUARY 1977 – REVISED SEPTEMBER 2025

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