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Balun at the output of AD9786

Hi, 

I would like to know why on the eval-board there is a 1:1 impedance ratio balun instead of 2:1 ratio at the output of the DAC AD9786. The output current is biased by the 100Ohm differential impedance, isn't it ? So we may need a 2:1 ratio to get 50Ohm in this case ?

Thanks in advances,

XL