I used DM542 drivers for a few years in an old machine and they worked OK. Be aware they are limited to 50V max though so are an entry level driver. The ones I used were analogue.

Reading the specs suggest the DM542A is analogue and the DM542T is digital with anti-resonance features, otherwise I can't see much difference. If this is the case then the DM542T is a better driver and there looks to be only a few dollars between them.

Do you know what sort of machine it is for because you get much better performance from 80V drivers.