Re: How to calculate AD9858 DFTW and DFRRW ????

Hi,

In my calculation, I have assumed DFTW to be 1MHz because you haven't define it in your post:

nome wrote:

 

Hello

 

We need Sweep Frequency 20MHz to 40MHz.

Please help me out how to calculate DFTW and DFRRW

if we assume DFRRW is 65535

Thanks 

So, if you want a 10MHz DFTW, you just plug in the known values (DFRRW=65535, Fsysclk, start freq and final freq) and you can solve for the unknown which is t (the time duration of sweep).

If your system clock Fsysclk is 1GHz, using the formula, t = 2.25ms.