AD9139 Evaluation board circuit

Question

Hello， 
 I am using AD9139 for the transmitter, the evaluation board uses two buluns, why use two balun? What's the effect of using only one? Thanks！

JMMina · Accepted Answer

Hi Draogn , 
 The two baluns in the DAC output data paths are for converting the differential output to single ended while suppressing the noise coming from the feedline (the 1:1 balun acts as an isolator). If using only one balun (i.e. the 1:2 balun only), SNR may not be optimal due to noise. 
 Regards, 
 Marco

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AD9139 Evaluation board circuit