PLL pulse generator(74HC4060、TC9122P)

Published:2011/4/13 2:38:00 Author:Ecco | Keyword: PLL , pulse generator | From:SeekIC

The PLL pulse generator is shown as the chart. The circuit is the phase-locked loop (PLL) pulse generator circuit. PLL makes a fractional frequency to crystal oscillator and gets 1kHz stepped frequency signal, moreover, it obtains 10kHz 999kHz pulse waveform on the output terminal. The manifold block 74HC4060 is a type of integrated chip with NOT gate and 1/2n frequency dividing circuit inside, among them, the NOT gate and the crystal oscillator with 4.096MHz form a oscillator circuit, and the frequency dividing circuit gets lkHz reference frequency signal by it.TC9122P is a high-speed programmable counter and its dividing ratio is decided by the BCD code, the programming data make the frequency ratio range be in 8 to 999, the circuit operates under the dividing ratio between 10 and 999. There are 3 types of phase comparator in 74HC4060, and the phase comparator PC2 can compare the output frequency with the positive edge of reference frequency, and get their feedback. The oscillation frequency of VC0 is decided by Cx, R1 and R2.



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