Owner's manual

LMV331/ LMV393
Document number: DS37022 Rev. 1 - 2
8 of 13
www.diodes.com
May 2014
© Diodes Incorporated
ADVANCED INFORMATION
LMV331/ LM
V
393
Application Information
Detailed Description
LMV331/LMV393 are low voltage single/dual general- purpose comparators. They have a single supply operating voltage range from 2.7V to 5.5V,
the common -mode input voltage range extends from -0.1V below the negative supply to within 0.8V of the positive supply.
The LMV331/393 series are built with BiCMOS process with bipolar input and output stages for improved noise performance. It is a cost-effective
solution for portable consumer products where space, low voltage, low power and price are the primary specification in circuit design.
Basic Comparator
A basic comparator circuit is used for converting analog signal to digital output. The LMV331/393 has open collect output structure, which required
a pull-high resistor to positive supply voltage for the output to switch properly. When the internal output transistor is off, the output voltage will be
pulled up to the external positive voltage.
The output pull- up resistor should be chosen high enough so as to avoid excessive power dissipation yet low enough to supply enough drive to
switch whatever load circuitry is used on the comparator output. On the LMV331/393 the pull-up resistor should range between 1KΩ to 10KΩ.
Power Supply Bypassing
For better performance, power supply bypass capacitor is necessary. For single-supply operation system, a Min. 0.1µF bypass capacitor should
be recommended to place as close as possible between V
CC
pin and GND.