No. This is the
maximum and you need to design for LESS than that.
It won't work properly with 1.5Vpp.
If you want a 50 Ohm input, then place a 0603 49R9.
You could just as well terminate in 100 Ohm or 150 if your source
can drive that properly. You burn the signal power in the resistor,
the chip just sees the voltage across it; it takes almost no current,
just that what's needed to charge the 2pF, or what the input capacitance
might be. Plus that tiny bit for the 75K bias resistor.
Even the old Motorola ECLIPSE series of ECL was perfectly happy
with 300 mV, and it worked to 4.4 GHz, where my signal generator
maxed out.
The standard ECL output hi/lo difference is 800 mV, and the inputs
are sensitive enough to allow for temperature, noise margin and...
The 3V3 ECL needs even less.
There are lots of ECL and CML parts on the market, and Hittite
was not even a real player in the open market. They used to ask
for a NDA for every tiny data sheet. No wonder they got bought by AD.
The best thing that could happen IMHO.
<
https://www.onsemi.com/pub/Collateral/AND8066-D.PDF >
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https://www.onsemi.com/pub/Collateral/AND8020-D.PDF >
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https://www.onsemi.com/pub/Collateral/NB7V52M-D.PDF >
Micrel/Microchip also have a lot.
regards, Gerhard