Two kinds of Si5351 exist

[EU1KY]

Trying to figure out why my Si5351a cannot generate frequencies more than 112.5 MHz, I've found that two different lots of Si5351a exist on the market. According to various specs and comparison tables, one of them has multisynth divider limits 8..2050, another one - 6..1800. There is no way to determine programmatically which one is in use. Also, I don't know a way to determine which one it is by its enclosure marking.

Therefore, I suggest to set multisynth limits to:

define SI5351_MULTISYNTH_A_MIN 8

define SI5351_MULTISYNTH_A_MAX 1800

Also, maximum output frequency should be limited to 112500000 Hz.