The DAB radio system was not adopted in the U.S.A. or Canada. The Canadian authorities permitted testing of DAB for quite awhile but eventually allowed it to die off due to lack of interest.
Instead, the iBiquity HDRadio IBOC standard was adopted in North America, which is a hybrid digital/analogue system that retains the traditional FM Radio band. While DAB and FM Radio occupy different parts of the spectrum, in North America you can think of digital radio as being a "superset" of the traditional analogue stations in the same band (IBOC means "In Band, On Channel).
So, a tuner with HDRadio capability and an old analogue FM tuner will both tune in the exact same station, but the former will process the digital portion of the station's signal in all its superior quality.
For broadcasters, the iBiquity HDRadio IBOC system can also be switched to 100% digital someday, but it is not likely to happen for a very long time if ever due to all the legacy analogue FM radios out there even in brand new consumer electronic gear. The automakers have come onboard with HDRadio-equipped tuners for the North American market.