TL072CD datasheet(39/75 Pages) TI

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9 Application 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.

9.1 Application Information

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

on the input, and makes the voltage a negative voltage. In the same manner, the amplifier makes negative

voltages positive.

9.2 Typical Application

Vsup+

VOUT

VIN

Vsup-

Figure 9-1. Inverting Amplifier

9.2.1 Design Requirements

The supply voltage must be selected so the supply voltage is larger than the input voltage range and output

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

to accommodate this application.

9.2.2 Detailed Design Procedure

Vo= Vi+Vio*1+1MΩ1kΩ

(1)

Determine the gain required by the inverting amplifier:

VOUT

A =

VIN

(2)

1.8

A =

3.6

0.5

= -

(3)

Once the desired gain is determined, select a value for RI or RF. Selecting a value in the kilohm range is

desirable because the amplifier circuit uses currents in the milliamp range. This ensures the part does not draw

too much current. This example uses 10 kΩ for RI which means 36 kΩ is used for RF. This is determined by

Equation 4.

A =

(4)

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TL071, TL071H, TL071A, TL071B

TL072, TL072H, TL072A, TL072B

TL074, TL074H, TL074A, TL074B, TL072M, TL074M

SLOS080Q – SEPTEMBER 1978 – REVISED JUNE 2021

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