Varying voltage with Arduino Uno

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i trying create variable voltage power phase shifter using arduino duo. have 8-bit dac (data sheet: http://www.mouser.com/ds/2/405/snas539a-214020.pdf)  don't know how interface dac , arduino. appreciated.

connect 8 outputs 8 ax inputs, figure 7 on page 8.
the outputs can outputs of shift register if want save few io pins.


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