LVDS is, as you know, a low voltage differential signaling layer. Generaly used at high
You could facilitate a LV scheme using VDACs but the speed would be abhorrently
slow with poor skew and CM preformance.
Think about using external translator logic to implement the physical layer and SPI, then
maybe you could get SPI rates over the link. But nothing like the typical 100 mbit rates
one sees in LVDS.