Hello,
We are using LMX2820, but observed spurious signals when using a large PLL fraction term (2097152001) as the denominator (see Video).
Video 1. 5.74GHz output frequency, with 40MHz as reference input and PLL_DEN=2097152001.
Although this issue can be alleviated by using lower PLL fraction term (65536000), we are curious about the reason and wondering if there is another solution to this issue, so that we can generate signals with higher precision in frequency.
Here is the configurations we used.
LMX2820_5.74G_40Mref_higher.tcs
Thank you!