If I put a SN7490(divided by five) IC in a Frequency Synthesizer PLL cirucit. Is it equal to input frequency * 5?
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Basic Frequency SynthesizerQuestion
Nov 01, 2004
2 Replies
The output of the chip, using just the divide by 5 section, will be one fifth of the input frequency, not 5 times.
Your good health.
If you put it between the output of the VCO and the reference input of the phase comparator, then the VCO output frequency will be 5 times the frequency on the external input to the phase comparator, on average. The output of the divider will be 1/5 of the VCO output and will equal the external input.
Bob Masta dqatechATdaqartaDOTcom D A Q A R T A Data AcQuisition And Real-Time Analysis
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