ATSC modulation

Hi guys,

I am interested in being able to generate ATSC/8VSB modulation and/or
playback a sampled ATSC/8VSB signal.

The modulation calculation does not need to be real time and can be
calculated off-line.
The playback of the pre-calculated modulation would be real-time and
loop the short burst of samples.

What DAC resolution and frequency would be needed for real time playback
of 8VSB modulated onto a 44MHz IF carrier?

Can you recommend off-the-shelf DAC hardware that would be able to do

I can configure an embedded processor we have here to output an 8-16bit
word at 250-300MHz - would a crude resistor ladder DAC work or would it
need a good silicon DAC?