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LM555CM Datasheet(PDF) 10 Page - ON Semiconductor |
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LM555CM Datasheet(HTML) 10 Page - ON Semiconductor |
10 / 15 page © 2002 Fairchild Semiconductor Corporation www.fairchildsemi.com LM555 Rev. 1.1.0 9 5. Pulse Position Modulation If the modulating signal is applied to the control terminal while the timer is connected for the astable operation, as in Figure 12, the timer becomes a pulse position modulator. In the pulse position modulator, the reference of the timer's internal comparators is modulated, which modulates the timer output according to the modulation signal applied to the control terminal. Figure 13 illustrates a sine wave for modulation signal and the resulting output pulse position modulation; however, any wave shape be used. 6. Linear Ramp When the pull-up resistor RA in the monostable circuit shown in Figure 2 is replaced with constant current source, the VC1 increases linearly, generating a linear ramp. Figure 14 shows the linear ramp generating circuit and Figure 15 illus- trates the generated linear ramp waveforms. Figure 12. Circuit for Pulse Position Modluation Figure 13. Wafeforms of pulse position modulation Figure 14. Circuit for Linear Ramp Figure 15. Waveforms of Linear Ramp 8 4 7 1 2 3 5 6 CONT GND Vcc DISCH THRES RESET TRIG OUT +Vcc R A C R B Modulation Output 1 5 6 7 8 4 2 3 RESET Vcc DISCH THRES CONT GND OUT TRIG +Vcc C2 R1 R2 C1 Q1 Output RE |
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