GDAS-2D represents the main and most general-purpose unit in the GDAS-2 family, and addresses the needs of the general users of GNSS signals digitizers in the current multiband and multiconstellation scenarios. The instrument, capable to down-convert and digitize all the RF bands that include GNSS signals broadcasted by any of the existing constellations, can be used as a reliable front-end in the development of multiband multiconstellation receivers.