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[AD9144] unused DAC pins


The customer  would like to know  pin connection when there are unused DACs at schematic.

1) When DAC2 and DAC3 are unused, what should do to +/-OUT2 and +/-OUT3? (No connect or connect to GND?) 

2) Relationship between PVDD12, CVDD12, AVDD33 and DAC#.

On EVM, some PVDD12 and these power are connected to GND.

But not clear which DAC# related with  each power pins in Datasheet.

or basically customer should  connect all power pins to appropriate powers with regardless whether DAC user ether unused.

Thank  you for  your  help as  always.

Best regards,