LMV321M7SLASHNOPB datasheet(31/52 Pages) TI1

31 / 52 page

LMV321-N, LMV321-N-Q1, LMV358-N

LMV358-N-Q1, LMV324-N, LMV324-N-Q1

www.ti.com

SNOS012J – AUGUST 2000 – REVISED DECEMBER 2014

Typical Applications (continued)

Figure 69. Power Amplifier

9.2.10 LED Driver

The LMV321-N/LMV358-N/LMV324-N can be used to drive an LED as shown in Figure 70.

Figure 70. LED Driver

9.2.11 Comparator With Hysteresis

The LMV321-N/LMV358-N/LMV324-N can be used as a low power comparator. Figure 71 shows a comparator

with hysteresis. The hysteresis is determined by the ratio of the two resistors.

VTH+ = VREF/(1+R 1/R2)+VOH/(1+R2/R1)

(30)

VTH− = VREF/(1+R 1/R2)+VOL/(1+R2/R1)

(31)

VH = (VOH−VOL)/(1+R 2/R1)

(32)

where

VTH+: Positive Threshold Voltage

VTH−: Negative Threshold Voltage

VOH: Output Voltage at High

VOL: Output Voltage at Low

VH: Hysteresis Voltage

Since LMV321-N/LMV358-N/LMV324-N have rail-to-rail output, the (VOH−VOL) is equal to VS, which is the supply

voltage.

VH = VS/(1+R2/R1)

(33)

The differential voltage at the input of the op amp should not exceed the specified absolute maximum ratings.

For

real

comparators

that

are

much

faster,

recommend

you

use

Texas

Instruments's

LMV331/LMV93/LMV339, which are single, dual and quad general purpose comparators for low voltage

operation.

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Product Folder Links: LMV321-N LMV321-N-Q1 LMV358-N LMV358-N-Q1 LMV324-N LMV324-N-Q1

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