You are going to need an adapter that you can solder the ADS1298 onto that has pins that will go into the breadboard. It looks like the -ZXG is the ball-grid-array package which is tough to work with for prototyping. If you got the version in the quad-flat pack (has the leads sticking out on all four sides rather than underneath the package) it would be a little easier. But prototyping with a part that has 64 pins is going to be a big pain on a breadboard no matter how you cut it.
Steve
