TL082ACD datasheet(30/66 Pages) TI

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9 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. Customers should validate and test their design

implementation to confirm system functionality.

9.1 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.

9.2 Typical Applications

9.2.1 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 it a negative voltage of the same magnitude. In the same manner, it also makes

negative voltages positive.

Vsup+

VOUT

VIN

Vsup-

Figure 9-1. Schematic for Inverting Amplifier Application

9.2.1.1 Design Requirements

The supply voltage must be chosen such that it is larger than the input voltage range and output range. For

instance, this application will scale a signal of ±0.5 V to ±1.8 V. Setting the supply at ±12 V is sufficient to

accommodate this application.

9.2.1.2 Detailed Design Procedure

Determine the gain required by the inverting amplifier:

VOUT

VIN

(1)

1.8

3.6

0.5

(2)

Once 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 will use currents in the milliamp range. This ensures the part will not draw too much

current. This example will choose 10 kΩ for RI which means 36 kΩ will be used for RF. This was determined by

Equation 3.

(3)

TL081, TL081A, TL081B

TL082, TL082A, TL082B, TL084, TL084A, TL084B, TL084H

SLOS081J – FEBRUARY 1977 – REVISED NOVEMBER 2020

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