HMC8191 LO Input power

I was looking into the max DC power the LO pin on the HMC8191 mixer can take. I know from the data sheet there a max 24 dBm on the LO pin, but I believe this refers to AC drive strength not a DC voltage found on the line. The data sheet says in the pin is has a internal DC block, but I need to know what DC voltage this pin can handle?

Should an external DC cap be used?