Vsup+

+

RF

RI

Vsup-

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20

LT1013, LT1013D, LT1013M, LT1013AM

SLOS018I – MAY 1988 – REVISED JULY 2016

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Copyright © 1988–2016, Texas Instruments Incorporated

8 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.

8.1 Application Information

The LT1013x operational amplifiers are useful in a wide range of signal conditioning applications where high DC

accuracy is needed.

8.2 Typical 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.

Figure 27. Application Schematic

8.2.1 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.

8.2.2 Detailed Design Procedure

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

(1)

(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 does not draw too

much current. This example chooses 10 kΩ for RI, which means 36 kΩ is used for RF. This was determined by

Equation 3.

(3)