TRF372017: What's the baseband input range?

The nominal input swing to the I/Q ports is differential 1V peak-to-peak.  You can check out Figure 1 in the TRF370317 datasheet which depicts the power output with respect to input swing (SE in the graph).  The modulator portion of the TRF3702017 shares the same IP as the TRF370317. 

--RJH