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Power control of DAC(AD9787)

My customer is trying to prevent abnormal signal output in DAC analog output when DAC is abnormal conditions such as power-up or non-configured.
So, She plans to separately control digital and analog power supply of DAC as below.

Step 1. Digital power-up of DAC(Analog power is not supplied)
Step 2. Stand by about 4~6 sec by system boot-up
Step 3. Set register in DAC
Step 4. Analog power-up of DAC

Is there any problem with the DAC if she uses the procedure as above?
Is there damage to hardware of the DAC If system operation is stopped in step 2?

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