LMK05028: Clock & timing forum

Hello Suzuki-san,

1.  Lock Threshold and Tph lock are the same thing, just presented in different formats.
   1. These controls work as follows:
      1. A lock threshold is set and a Tph lock is calculated in seconds.
      2. The DPLL is considered as phase locked if the phase difference between the two inputs of TDC (divided reference and divided VCO1) is within the lock threshold.
2. Unlock threshold and Tph unlock are the same thing, just presented in different formats.
   1. These controls work as follows:
      1. A unlock threshold is set and a Tph unlock is calculated in seconds.
      2. While the DPLL is phase locked, it's considered as phase unlocked if the phase difference between the two inputs of TDC (divided reference and divided VCO1) exceeds the unlock threshold.
3. Lock LPF coefficient.
   1. This control is a filter for the phase variation on the VCO1 feedback. Higher values are more filtering.

Thanks!

Regards,

Kia Rahbar