The Phoenix MARDI is of the same generation as the Mars Polar Lander MARDI.
For further information on the Mars Polar Lander MARDI, see:

• MSSS Mars Polar Lander MARDI Web Site, 1999
  
  
• Malin, M. C., M. A. Caplinger, M. H. Carr, S. Squyres, P. Thomas, and J. Veverka (2001) "Mars Descent Imager (MARDI) on the Mars Polar Lander," Journal of Geophysical Research, 106(E8), 17,635–17,650, doi:10.1029/1999JE001144. — PDF, courtesy of AGU