NQ21HT449
Newbie
Hi, I'm trying to see how granular frequency resolution can I achieve given my interger-N PLL (with no fractional or prescaler).
In my case, I have 10 MHz reference, and my desired output is 40 MHz to 60 MHz, hence I need N/R ratio to be from 4 to 6, and the question is, how can I choose values of
N/R so N (between 1 and 2^14 = 16384) and R (between 1 and 2^13 = 8192) gives N/R resolution of 0.1 MHz, i.e. N/R = 4, 4.1, 4.2 ... 5.9, 6?
If I want to have 1 kHz resolution, so that N/R is 4.001, 4.002, ... 5.999, 6, can I achieve it with this PLL, and if so, how can I select the values of N/R
Knowing that, I think I can figure out how many bits of N and R I need to achieve resolution desired in our application.
Thank you
In my case, I have 10 MHz reference, and my desired output is 40 MHz to 60 MHz, hence I need N/R ratio to be from 4 to 6, and the question is, how can I choose values of
N/R so N (between 1 and 2^14 = 16384) and R (between 1 and 2^13 = 8192) gives N/R resolution of 0.1 MHz, i.e. N/R = 4, 4.1, 4.2 ... 5.9, 6?
If I want to have 1 kHz resolution, so that N/R is 4.001, 4.002, ... 5.999, 6, can I achieve it with this PLL, and if so, how can I select the values of N/R
Knowing that, I think I can figure out how many bits of N and R I need to achieve resolution desired in our application.
Thank you