Silicon Laboratories SI5351A/B/C - Manual (Page 29)

Si5351A/B/C
Preliminary Rev. 0.95 29
Reset value = 0000 0000
Register 15. PLL Input Source
Bit D7 D6 D5 D4 D3 D2 D1 D0
Name PLLB_SRC PLLA_SRC
Type R/W R/W R/W R/W R/W R/W R/W R/W
Bit Name Function
7:4 Reserved Leave as default.
3 PLLB_SRC Input Source Select for PLLB.
0: Select the XTAL input as the reference clock for PLLB (Si5351A/C only).
1: Select the CLKIN input as the reference clock for PLLB (Si5351C only).
2 PLLA_SRC Input Source Select for PLLA.
0: Select the XTAL input as the reference clock for PLLA.
1: Select the CLKIN input as the reference clock for PLLA (Si5351C only).
1:0 Reserved Leave as default.