Jitter Considerations

Zynq UltraScale+ Device Technical Reference Manual (UG1085)

Document ID
UG1085
Release Date
2022-09-15
Revision
2.3 English

PLL jitter performance is better in integer mode. Whenever possible, always use integer mode. The fractional modulus of the PLL feedback divide is 16 bits wide, hence, 0.F can be set to any value equal to n/216, where n = 1, 2, …, 216-1. In fractional mode, minimize jitter by generating the highest possible VCO frequency that is with its operating range.