LMC555CM datasheet(10/21 Pages) TI

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LMC555

SNAS558J – FEBRUARY 2000 – REVISED MARCH 2013

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PULSE POSITION MODULATOR

This application uses the timer connected for astable operation, as in Figure 14, with a modulating signal again

applied to the control voltage terminal. The pulse position varies with the modulating signal, since the threshold

voltage and hence the time delay is varied. Figure 15 shows the waveforms generated for a triangle wave

modulation signal.

Figure 14. Pulse Position Modulator

VCC = 5V

Top Trace: Modulation Input 1 V/Div.

TIME = 0.1 ms/Div.

Bottom Trace: Output Voltage 2 V/Div.

RA = 3.9 kΩ

RB = 3 kΩ

C = 0.01 µF

Figure 15. Pulse Position Modulator Waveforms

50% DUTY CYCLE OSCILLATOR

The frequency of oscillation is

f = 1/(1.4 RCC)

Figure 16. 50% Duty Cycle Oscillator

10

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