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LMC555CMMX Datasheet(PDF) 7 Page - National Semiconductor (TI) |
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LMC555CMMX Datasheet(HTML) 7 Page - National Semiconductor (TI) |
7 / 12 page Application Information (Continued) PULSE POSITION MODULATOR This application uses the timer connected for astable opera- tion, as in Figure 10, 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 11 shows the waveforms generated for a triangle wave modulation signal. 50% DUTY CYCLE OSCILLATOR The frequency of oscillation is f = 1/(1.4 R CC) micro SMD Marking Orientation Top View 00866923 Bumps are numbered counter-clockwise 00866915 VCC = 5V Top Trace: Modulation 1 V/Div. TIME = 0.2 ms/Div. Bottom Trace: Output Voltage 2 V/Div. RA = 9.1 kΩ C = 0.01 µF FIGURE 9. Pulse Width Modulator Waveforms 00866921 FIGURE 10. Pulse Position Modulator 00866916 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 =3kΩ C = 0.01 µF FIGURE 11. Pulse Position Modulator Waveforms 00866906 FIGURE 12. 50% Duty Cycle Oscillator www.national.com 7 |
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