Data Sheet

©2009-2013 Exar Corporation

12/15

Rev 1A

Application Information

General Description

The LMV321 is a single supply, general purpose, voltage-

feedback amplifier fabricated on a CMOS process. The

LMV321 offers 1MHz gain bandwidth product, >1V/μs slew

rate, and only 130μA supply current. It features a rail-to-rail

output stage and is unity gain stable.

The common mode input range extends to 200mV below

ground and to 800mV below Vs. Exceeding these values

will not cause phase reversal. However, if the input voltage

exceeds the rails by more than 0.5V, the input ESD devices

will begin to conduct. The output will stay at the rail during

this overdrive condition.

The output stage is short circuit protected and offers “soft”

saturation protection that improves recovery time.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. Figure 4

shows the typical non-inverting gain circuit for single supply

applications

+

-

0.1µF

6.8µF

Output

Input

0.1µF

6.8µF

Figure 1. Typical Non-Inverting Gain Circuit

+

-

0.1µF

6.8µF

Output

For optimum input offset

Input

0.1µF

6.8µF

Figure 2. Typical Inverting Gain Circuit

+

-

0.1µF

6.8µF

Output

G = 1

Input

0.1µF

6.8µF

Figure 3. Unity Gain Circuit

+

-

0.1µF

6.8µF

Output

Input

Figure 4. Single Supply Non-Inverting Gain Circuit

Power Dissipation

Power dissipation should not be a factor when operating

under the stated 2kΩ load condition. However, applications

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 operating range.

Maximum power levels are set by the absolute maximum

junction rating of 150°C. To calculate the junction

temperature, the package thermal resistance value

dissipation.

needs to be subtracted from the total power delivered by