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These are high-speed DACs, and are generally not used in applications requiring a DC value.
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I don't agree. This sounds like high speed DACs (and also ADCs) won't be suited for wideband DC capable applications. But they surely are, and a lot of applications is relying on their DC specification. The Terasic THDB_ADA board (as well as several Altera DSP DevKits) is apparently targetting to "passband" RF applications that don't need DC capability. For these, transformer coupling is the most simple (and cheapest) way to achieve good performance.
I noticed, that the AC coupling of these DevKits is unsuitable for many users, who are dealing with wideband DSP applications. It's easy to remove the transformers, and the boards already have jumper options to DC couple the ADC and DAC analog interfaces. But particularly the high end DevKits won't look bad with a state-of-the-art DC capable interface. The transformer interface could be still provided as an assembly option.
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