AD9174 output

Question

Hi, 
 I am using AD9174 DAC for transmitting frequency of 300MHz, 2.5GHz & 5 GHz output. As mentioned in the datasheet, I'm using 1:1 balun for frequency above 2GHz. 
 I have attached the images of schematic & layout of the output section of DAC . I could see that the capacitor placement in the DAC output is not matching the circuit in page 72 of datasheet. Please could you brief us about the impact of this placement change on the performance. 
 
 Thanks in Advance!

kberry · Accepted Answer

Hi, 
 C566/568 upstream of the chokes should be removed (the chokes are providing a DC offset path to ground). Otherwise the design mimics our eval board setup with a slightly smaller balun range (below) and should be all set.)

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AD9174 output