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Frequency Multiplier


Jan 2, 2012
Jan 2, 2012
I am constructing a frequency multiplier as part of a digital audio system (I2S clocks).
I need to multiply a clock frequency by 256. Usually the input clock is 44.1kHz or 48kHz, but can be lower.
In any case, the highest output frequency will be less than 13MHz.

First I thought I would use a standard circuit with an the old PLL circuit CD4046 and some counter like CD4020, containing eight stages.
I have seen that the newer versions, 74HC4046 and 74HC4020 would probably be able to do the work at 5V supply.
But I don't like that solution very much, because:
1) I would like to run the system on 3V
2) This function takes too much space! Two 16-pin IC's to do the task that probably could be done in one small package.
The advantage though, is the low cost of these two circuits.

My question to you:
Have you any other suggestion of a good, cheap and compact circuit, preferably running on 3V?
I have looked around now for a while and only found GHz circuits and expensive stuff.