LMV393

Preliminary

LINEAR INTEGRATED CIRCUIT

UNISONIC TECHNOLOGIES CO., LTD

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www.unisonic.com.tw

QW-R104-004.c

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APPLI CAT I ON CI RCU I T S

Basic Comparator

A basic comparator circuit can convert analog signals to a digital output. The UTC LMV393 needs a pull-up

resistor connected to the positive supply voltage which can make output switch properly. So that when the internal

output transistor is off, the output voltage will be pulled up to the external positive voltage.

The resister should be chosen properly. The higher resister can reduce the power dissipation. the lower resister

can improve the capacity of loading output. The range of resister should between 1k to 10k

Ω.

The Output voltage of the comparator will be high if the input voltage at the non-inverting pin is greater than the

reference voltage at the inverting pin. On the other hand it will be low.

Comparator with Hysteresis

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

comparator’s offset voltage, especially when the input signal is moving slowly across the comparator’s switching

threshold. Addition of hysteresis or positive feedback can solve this problem.

Inverting Comparator with Hysteresis

voltage is high, these resistors can be represented as R1 // R3 in series with R2. The lower set input voltage is

defined as:

2

3

1

2

CC

1

R

+

)

//R

(R

R

V

=

Va