Electronic – ny advantage to use a PLL with unitary frequency gain

firmwaremicrocontrollerpll

I am not a very experienced firmware developer, so I came across this doubt when I was reading the datasheet of a microcontroller:

In my application, I will use a crystal to generate a clock signal of 26 MHz, the same frequency I want in my system's clock bus. Reading the section that explain about the PLL module, I found the table below:

Table from the manufacturer datasheet

In the first line, it is shown a use case where the output frequency is the same as the input frequency.

So, my question is: Is there any advantage to make use of a PLL module with frequency gain equals to one, as my source clock is already in the desired frequency?

Best Answer

The use case for that would be for the PLL cleaning up the clock signal, i.e. lowering jitter. If you already have a good clock source, then there is no real benefit.

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