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NA555 Datasheet(PDF) 14 Page - Texas Instruments |
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NA555 Datasheet(HTML) 14 Page - Texas Instruments |
14 / 27 page www.ti.com Pulse-Position Modulation RA = 3 kΩ RB = 500 Ω RL = 1 kΩ See Figure 20 Capacitor Voltage Output Voltage Modulation Input Voltage Time − 0.1 ms/div RB Modulation Input (see Note A) CONT TRIG RESET VCC OUT DISCH VCC (5 V to 15 V) RL RA C GND THRES NOTE A: The modulating signal can be direct or capacitively coupled to CONT. For direct coupling, the effects of modulation source voltage and impedance on the bias of the timer should be considered. Pin numbers shown are for the D, JG, P, PS, and PW packages. 4 8 3 7 6 2 5 Output NA555, NE555, SA555, SE555 PRECISION TIMERS SLFS022F – SEPTEMBER 1973 – REVISED JUNE 2006 APPLICATION INFORMATION (continued) As shown in Figure 20, any of these timers can be used as a pulse-position modulator. This application modulates the threshold voltage and, thereby, the time delay, of a free-running oscillator. Figure 21 shows a triangular-wave modulation signal for such a circuit; however, any wave shape could be used. Figure 20. Circuit for Pulse-Position Modulation Figure 21. Pulse-Position-Modulation Waveforms 14 Submit Documentation Feedback |
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