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LMV762MA Datasheet(PDF) 12 Page - Texas Instruments

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Part No. LMV762MA
Description  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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LMV762MA Datasheet(HTML) 12 Page - Texas Instruments

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VO
0
VIN2
VIN1
VIN
VO
VIN
VCC
VREF
-
+
R2
R1
LMV761, LMV762, LMV762Q-Q1
SNOS998I – FEBRUARY 2002 – REVISED OCTOBER 2015
www.ti.com
Feature Description (continued)
Hysteresis can easily be added to a comparator in a noninverting configuration with two resistors and positive
feedback Figure 22. The output will switch from low to high when VIN rises up to VIN1, where VIN1 is calculated by
Equation 1:
VIN1 = [VREF(R1 + R2)] / R2
(1)
The output will switch from high to low when VIN falls to VIN2, where VIN2 is calculated by Equation 2:
VIN2 = [VREF(R1 + R2) – (VCC R1)] / R2
(2)
The Hysteresis is the difference between VIN1 and VIN2, as calculated by Equation 3:
ΔVIN = VIN1 – VIN2 = [VREF(R1 + R2) / R2] – [VREF(R1 + R2)] – [(VCC R1) / R2] = VCC R1 / R2
(3)
Figure 21. Basic Comparator With Hysteresis
Figure 22. Noninverting Comparator Configuration
7.3.3 Input
The LMV76x devices have near-zero input bias current, which allows very high resistance circuits to be used
without any concern for matching input resistances. This near-zero input bias also allows the use of very small
capacitors in R-C type timing circuits. This reduces the cost of the capacitors and amount of board space used.
7.4 Device Functional Modes
7.4.1 Shutdown Mode
The LMV761 features a low-power shutdown pin that is activated by driving SD low. In shutdown mode, the
output is in a high-impedance state, supply current is reduced to 20 nA and the comparator is disabled. Driving
SD high will turn the comparator on. The SD pin must not be left unconnected due to the fact that it is a high-
impedance input. When left unconnected, the output will be at an unknown voltage. Do not three-state the SD
pin.
The maximum input voltage for SD is 5.5 V referred to ground and is not limited by VCC. This allows the use of
5-V logic to drive SD while VCC operates at a lower voltage, such as 3 V. The logic threshold limits for SD are
proportional to VCC.
12
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Copyright © 2002–2015, Texas Instruments Incorporated
Product Folder Links: LMV761 LMV762 LMV762Q-Q1


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