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AD9910 balun transformer

Question asked by Cjp3323 on Mar 19, 2013
Latest reply on Mar 19, 2013 by Cjp3323

Hi,

 

    I was looking at the AD9910 evaluation board schematic and was wondering how they got the values for their resistors that tie both of the DAC outputs to ground. My circuit is exactly the same except that my sma connectors are rated at 50 ohms (not sure about the ones on the eval sch). I think we chose the 49.9 ohm terminating resistors at the DAC output just because the evaluation board schematic had them. My load impedance is thus the two smas in parallel which is 25 ohms and according to the app note AN912, my terminating resistors should be 12.5 ohms each. Is this right or am I missing something here?

 

Thanks,

Caleb

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