We are looking are switching to the AD9176 from the AD9172. One thing I noticed is the AD9172 recommends a DC coupling output network to the Balun with RF Chokes close to the balun. On the AD9176, page 69 of the datasheet, it talks about being able to do this still but the recommended diagram shows the rf chokes and AC Coupling caps. I was curious why the AC Caps were added for the AD9176. If possible, I would like to keep the board as it was for the AD9172 but if it is highly recommended to add the AC caps, I will move forward and make that change.