As far as I understand the RMII output signal of an ethernet PHY is a TTL signal (at least according to wikipedia). I need to convert these into LVPECL signals. So on the one side I have something like TX0 and TX1 from the RMII and on the other side I have Tx- and Tx+ for the LVPECL interface. How can I interconvert these signals (also LVPECL to TTL)? I found the MAX9370 TTL/LVPECL translater but wouldn't TX0 then split into two signals (same with TX1)? So i would end up with a four signal output from the MAX9370 translater. But I only need two signals as LVPECL input. I think I'm missing something important here.
Some more details: the phy of interest is the LAN8720. According to the datasheet the RMII outputs LVCMOS signals. These should be converted to LVPECL signals in order to serve as an input for an optical transceiver. My goal is to build a media converter.