V

+

VREF

VIN

VO

-

+

V

-

V

+

VREF

VIN

VO

-

+

V

-

LMV761, LMV762, LMV762Q-Q1

www.ti.com

SNOS998I – FEBRUARY 2002 – REVISED OCTOBER 2015

7 Detailed Description

7.1 Overview

The LMV76x family of precision comparators is available in a variety of packages and is ideal for portable and

battery-operated electronics.

To minimize external components, the LMV76x family features a push-pull output stage where the output levels

are power-supply determined. In addition, the LMV761 (single) features an active-low shutdown pin that can be

used to disable the device and reduce the supply current.

7.2 Functional Block Diagram

7.3 Feature Description

7.3.1 Basic Comparator

A basic comparator circuit is used to convert analog input signals to digital output signals. The comparator

compares an input voltage (VIN) at the noninverting input to the reference voltage (VREF) at the inverting pin. If

VIN is less than VREF the output (VO) is low (VOL). However, if VIN is greater than VREF, the output voltage (VO) is

high (VOH).

Figure 19. Basic Comparator Without Hysteresis

Figure 20. Basic Comparator

7.3.2 Hysteresis

The basic comparator configuration may oscillate or produce a noisy output if the applied differential input is near

the input offset voltage of the comparator, which tends to occur when the voltage on one input is equal or very

close to the other input voltage. Adding hysteresis can prevent this problem. Hysteresis creates two switching

thresholds (one for the rising input voltage and the other for the falling input voltage). Hysteresis is the voltage

difference between the two switching thresholds. When both inputs are nearly equal, hysteresis causes one input

to effectively move quickly past the other. Thus, moving the input out of the region in which oscillation may occur.

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