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LMV331M7X Datasheet(PDF) 10 Page - Texas Instruments

Part # LMV331M7X
Description  General-Purpose, Low-Voltage, Tiny Pack Comparators
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
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LMV331-N, LMV339-N, LMV393-N
SNOS018H – AUGUST 1999 – REVISED DECEMBER 2014
www.ti.com
8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
8.1.1 Basic Comparator
The comparator compares the input voltage (VIN) at the non-inverting pin to the reference voltage (VREF) at the
inverting pin. If VIN is less than VREF, the output voltage (VO) is at the saturation voltage. On the other hand, if VIN
is greater than VREF, the output voltage (VO) is at VCC.
Figure 10. Basic Comparator
8.1.2 Comparator With Hysteresis
The basic comparator configuration may oscillate or produce a noisy output if the applied differential input
voltage is near the comparator's offset voltage. This usually happens when the input signal is moving very slowly
across the switching threshold of the comparator. This problem can be prevented by the addition of hysteresis or
positive feedback.
8.1.2.1 Inverting Comparator With Hysteresis
The inverting comparator with hysteresis requires a three resistor network that are referenced to the supply
voltage VCC of the comparator. When Vin at the inverting input is less than Va, the voltage at the non-inverting
node of the comparator (Vin < Va), the output voltage is high (for simplicity assume VO switches as high as VCC).
The three network resistors can be represented as R1//R3 in series with R2. The lower input trip voltage Va1 is
defined as:
(1)
When Vin is greater than Va (Vin > Va), the output voltage is low very close to ground. In this case the three
network resistors can be presented as R2//R3 in series with R1. The upper trip voltage Va2 is defined as:
(2)
10
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Copyright © 1999–2014, Texas Instruments Incorporated
Product Folder Links: LMV331-N LMV339-N LMV393-N


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