AD5761ARUZ-RL7

Question

Questions for a fool 
 I wanted to just reach out to the analogue devices community for a bit of assistance. Im working with a AD5761 DAC and I am trying to give it appropriate bipolar voltages. Looking over the data sheet I see that I can use the ADP5070 in conjunction with a few other ICs to produce a bipolar voltage of -11v and +11v. The real question is do I really need +21v and -13v if I plan to only use +-10v? Its my first year in college and im not exactly a pro with PCB design so I also had some questions on the total power consumption as it wasn't entirely clear in the datasheet when I reviewed it. I have about 20 of my AD5761s I need to power and im not sure how many ADP5070s I might need which Is why I am asking for their total power consumption. Anything helps, even insults on my intellect as I plan to be a good electrical engineer someday.

Justlap · Accepted Answer

For DAC power consumption under load, that depends on the output voltage since the output current will depend on the load unless it is a current sink/source device. 
 As the first approximation, the DAC will dissipate the current of the load times the delta voltage of the supply minus the output voltage. This value will be added to the power consumption with no load, this value is in the DS.)