Datasheet for the si5351
https://www.silabs.com/documents/public/data-sheets/Si5351-B.pdf
Adafruits development board
https://learn.adafruit.com/adafruit-si5351-clock-generator-breakout/overview
A link to my github repo that has the si5351 library
https://github.com/thaaraak/Tinypico-Radio