LM158 datasheet(29/61 Pages) TI

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10 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. Customers should validate and test their design

implementation to confirm system functionality.

10.1 Application Information

The LMx58 and LM2904 operational amplifiers are useful in a wide range of signal conditioning applications.

Inputs can be powered before VSfor flexibility in multiple supply circuits.

10.2 Typical Application

A typical application for an operational amplifier is 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 10-1. Application Schematic

10.2.1 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 scales a signal of ±0.5 V to ±1.8 V. Setting the supply at ±12 V is sufficient to

accommodate this application.

10.2.2 Detailed Design Procedure

Determine the gain required by the inverting amplifier using Equation 1 and Equation 2:

VOUT

VIN

(1)

1.8

3.6

0.5

(2)

Once the desired gain is determined, choose a value for RI or RF. [Subscripts should be fixed in the

accompanying figures and equations also.] Choosing a value in the kilohm range is desirable because the

amplifier circuit uses currents in the milliampere 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 was determined by Equation 3.

(3)

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LM158, LM158A, LM258, LM258A

LM2904, LM2904B, LM2904BA, LM2904V

LM358, LM358A, LM358B, LM358BA

SLOS068Z – JUNE 1976 – REVISED JULY 2021

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