PGA281 power sequence

Hello

   I need your suggestion on power supply sequence on page 21 Figure 45, DVDD on first, then delay time with RC on VSOP and final 2-times delay time on VSP,VSN.

  On page 20, However, "DVDD must be 1 V less than VSP". DVDD can be turned on without the analog supply being present and is operational."

 Is it necessary to connect a diode between DVDD and VSP for clamping voltage?

thank you