LMC6762AIM datasheet(10/13 Pages) NSC

부품명	LMC6762AIM

상세설명	Dual MicroPower Rail-To-Rail Input CMOS Comparator with Push-Pull Output

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Typical Applications (Continued)

A monostable multivibrator has one stable state in which it

can remain indefinitely. It can be triggered externally to an-

other quasi-stable state. A monostable multivibrator can thus

be used to generate a pulse of desired width.

The desired pulse width is set by adjusting the values of C

2

and R

4. The resistor divider of R1 and R2 can be used to de-

termine the magnitude of the input trigger pulse. The

LMC6762 will change state when V

1 < V2. Diode D2 pro-

vides a rapid discharge path for capacitor C

2 to reset at the

end of the pulse. The diode also prevents the non-inverting

input from being driven below ground.

Bi-Stable Multivibrator

A bi-stable multivibrator has two stable states. The reference

voltage is set up by the voltage divider of R

2 and R3. A pulse

applied to the SET terminal will switch the output of the com-

parator high. The resistor divider of R

1,R4, and R5 now

clamps the non-inverting input to a voltage greater than the

reference voltage. A pulse applied to RESET will now toggle

the output low.

Zero Crossing Detector

A voltage divider of R

4 and R5 establishes a reference volt-

age V

1 at the non-inverting input. By making the series resis-

tance of R

1 and R2 equal to R5, the comparator will switch

when V

IN = 0. Diode D1 insures that V3 never drops below

−0.7V. The voltage divider of R

2 and R3 then prevents V2

from going below ground. A small amount of hysteresis is

setup to ensure rapid output voltage transitions.

Oscillator

Figure 9 shows the application of the LMC6762 in a square

wave generator circuit. The total hysteresis of the loop is set

by R

1,R2 and R3.R4 and R5 provide separate charge and

discharge paths for the capacitor C. The charge path is set

through R

4 and D1. So, the pulse width t1 is determined by

the RC time constant of R

4 and C. Similarly, the discharge

path for the capacitor is set by R

5 and D2. Thus, the time t2

between the pulses can be changed by varying R

5, and the

pulse width can be altered by R

4. The frequency of the out-

put can be changed by varying both R

4 and R5.

DS012320-15

FIGURE 7. Bi-Stable Multivibrator

DS012320-16

FIGURE 8. Zero Crossing Detector

DS012320-19

FIGURE 9. Square Wave Generator

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Texas Instruments	LMC6762AIM	1Mb / 22P	[Old version datasheet] Dual MicroPower Rail-To-Rail Input CMOS Comparator with Push-Pull Output
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Texas Instruments	LMC6762	1Mb / 22P	[Old version datasheet] Dual MicroPower Rail-To-Rail Input CMOS Comparator with Push-Pull Output
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LMC6762AIM 데이터시트(PDF) 10 Page - National Semiconductor (TI)

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