Hi,
I did a quick scan of the datasheets and it appears that this should work fine. In fact, figure 18 of the datasheet indicates that the mode pin has a 100 kOhm internal pullup resistor. So it looks like the part will work even if pin 48 is left floating.
Also, use the DAC5672A not the DAC5672. The DAC5672 has strict AVDD to DVDD powerup requirements which were removed in the DAC5672A.
Also, the DAC5672A cannot tolerate 5-V supplies for the analog and digital power supplies.
Regards,
Matt Guibord