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 LM2904-Q1 and LM2904B-Q1 operational amplifiers are useful in a wide range of signal conditioning

guidelines related to this family of devices, please refer to the application report Application design guidelines for

LM324/LM358 devices.

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+

+

RF

RI

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:

V

VOUT

A

VIN

(1)

V

1.8

A

3.6

0.5

(2)

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

by Equation 3.

V

RF

A

RI

(3)

LM2904-Q1, LM2904B-Q1

SLOS414J – MAY 2003 – REVISED FEBRUARY 2021

www.ti.com

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