5 Si5351
Sebastian edited this page 2 years ago

Frequenz setzen

f_out = f_xtal * p * 1/m * 1/r

  • p PLL-Faktor, zwischen 15 und 90
  • m Multisynth-Faktor, zwischen 6 und 1800
  • r Output-Teiler r = 2 ^ n für 0 <= n <= 7

Beispiel Code: https://radiotransmitter.wordpress.com/2017/02/23/a-simple-software-to-control-the-si5351a-generator-chip/

Register berechnen

Application Note: https://www.silabs.com/documents/public/application-notes/AN619.pdf

Für a + b/c = m:

MSNx_P1 = 128 * a + floor(128 * b/c) + 512
MSNx_P2 = 128 * b - c * floor(128 * b/c)
MSNx_P3 = c

MSNx_P1: 18bit MSNx_P2: 20bit MSNx_P3: 20bit