In AD9952 Datasheet (rev.0) the Pin Function Descriptions (page 9) states that
pins 47 and 48 are DGND. However, in Figure 3 (pin configuration, page 8) these
two pins are marked as DVDD! Which one is correct?
Pins 47 and 48 of the AD9952 are digital inputs (unused on AD9952) so they can
be connected either to VDD or to GND. The easiest solution is to connect them
both to ground.