Data Sheet

©2009-2013 Exar Corporation

10/17

Rev 1D

Application Information

Basic Operation

Figures 1, 2, and 3 illustrate typical circuit configurations for

non-inverting, inverting, and unity gain topologies for dual

supply applications. They show the recommended bypass

capacitor values and overall closed loop gain equations.

+

-

0.1μF

6.8μF

Output

Input

0.1μF

6.8μF

Figure 1. Typical Non-Inverting Gain Circuit

Figure 2. Typical Inverting Gain Circuit

+

-

0.1uF

6.8uF

Output

G = 1

Input

0.1uF

6.8uF

Figure 3. Unity Gain Circuit

Power Dissipation

Power dissipation should not be a factor when operating

under the stated 2k ohm load condition. However, ap-

plications with low impedance, DC coupled loads should

be analyzed to ensure that maximum allowed junction

temperature is not exceeded. Guidelines listed below can

be used to verify that the particular application will not

cause the device to operate beyond it’s intended operat-

ing range.

Maximum power levels are set by the absolute maximum

junction rating of 150°C. To calculate the junction tem-

needs to be subtracted from the total power delivered by

the supplies.

Supply power is calculated by the standard power equa-

tion.

Power delivered to a purely resistive load is:

the effect of the feedback network. For instance,

These measurements are basic and are relatively easy to

perform with standard lab equipment. For design purposes

however, prior knowledge of actual signal levels and load

impedance is needed to determine the dissipated power.

can be calculated as above with the desired signal ampli-

tudes using:

+

-

0.1μF

6.8μF

Output

For optimum input offset

Input

0.1μF

6.8μF