Looking at the datasheet, it is implied that this DSP can turn into a full tuner by adding an RF and IF front end. 2 Philips chips are suggested (TEA6824 & TEA6811), but they are both discontinued. Nontheless, an FM receiver front-end should be cheapo. Integrating in to the DSP might be more complicated.

Are these the chips currently in the tuner add-on?

-Ted