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LMV762MM Datasheet(PDF) 9 Page - Texas Instruments

Part No. LMV762MM
Description  LMV761/LMV762/LMV762Q Low Voltage, Precision Comparator with Push-Pull Output
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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LMV762MM Datasheet(HTML) 9 Page - Texas Instruments

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VO
VIN
VCC
VREF
-
+
R2
R1
V
+
VREF
VIN
VO
-
+
V
-
LMV761, LMV762
www.ti.com
SNOS998H – FEBRUARY 2002 – REVISED MARCH 2013
APPLICATION INFORMATION
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 non-inverting 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 24. Basic Comparator
HYSTERESIS
The basic comparator configuration may oscillate or produce a noisy output if the applied differential input is near
the comparator's input offset voltage. This 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.
Hysteresis can easily be added to a comparator in a non-inverting configuration with two resistors and positive
feedback Figure 25. The output will switch from low to high when VIN rises up to VIN1, where VIN1 is calculated by
VIN1 = [VREF(R1+R2)] / R2
(1)
The output will switch from high to low when VIN falls to VIN2, where VIN2 is calculated by
VIN2 = [VREF(R1+R2) – (VCC R1)] / R2
(2)
The Hysteresis is the difference between VIN1 and VIN2.
ΔVIN = VIN1 - VIN2 = [VREF(R1+R2) / R2] - [VREF(R1+R2)] - [(VCC R1) / R2] = VCC R1 / R2
(3)
Copyright © 2002–2013, Texas Instruments Incorporated
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Product Folder Links: LMV761 LMV762


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