Is the input to the Analog to Digital converter channel of the MC68HC12 analog ac or analog dc?

I have a 80.205Vpp sine wave signal that I would like to condition so it
converts to 0-5v input for the ADT of the MC68HC12. I'm still not clear if the input to the MC68HC12 should be 5Vdc or can be a divided down 5v sine wave, ac. The signal is low frequency, less than 100Hz. It is the output of a Tachometer.