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Clock and Data Distribution Products Pt1 Slide 7

The results of the example are shown on this slide. First, calculate feedback frequency, Ffb, which is equal to the input frequency, Fin, divided by the pre-divider, P. Fin is 125 MHz and P is equal to five, resulting in an Ffb equal to 25 MHz. Next, calculate the VCO output frequency, Fvco which is equal to the Ffb, 25 MHz, multiplied by the feedback divider, M, given at 25;  25 multiplied by 25 is 625, so the output frequency of the VCO is 625 MHz. Lastly, calculate the output frequency, Fout, by dividing the output frequency of the VCO, 625 MHz, by the output divider which is equal to ten; 625 divided by 10 is 62.5, hence the Fout is equal to 62.5 MHz.

PTM Published on: 2014-08-04