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Counters
34 questions By Tony R. Kuphaldt
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Question 34 of 34
When counters are used as frequency dividers, they are often drawn as simple boxes with one input and one output each, like this:
Calculate the four output frequencies (fout1 through fout4) given an input frequency of 25 kHz:
- fout1 =
- fout2 =
- fout3 =
- fout4 =
Reveal answer- fout1 = 5 kHz
- fout2 = 625 Hz
- fout3 = 312.5 Hz
- fout4 = 31.25 Hz
Follow-up question: if the clock frequency for this divider circuit is exactly 25 kHz, is it possible for the divided frequencies to vary from what is predicted by the modulus values (5 kHz, 625 Hz, 312.5 Hz, and 31.25 Hz)? Explain why or why not.
Notes:The purpose of this question is to introduce students to the schematic convention of counter/dividers as simple boxes with “MOD” specified for each one, and to provide a bit of quantitative analysis (albeit very simple).
