Clock input circuit for 0.8Vpp TCXO

[gxti]

I have a TCXO that puts out a clipped sine wave that peaks at 0.8V, which I wish I would have noticed before I designed it in. Many TCXOs, in particular the cheap ones, seem to have this type of output, so using a different oscillator isn't feasible. I need to convert that to a 3.3V CMOS signal for clocking a microcontroller. Using a schmitt inverter circuit I had handy seems to work, but the datasheet specifies a maximum hysteresis of 1.2V, and that's just at room temperature, so I don't think I can rely on that.

Comparators look promising but ones fast enough to toggle at 30MHz are several dollars each vs the $0.50 inverter. Non-schmitt inverters seem like another possibility, e.g. 74LVC2GU04G. The datasheet only guarantees operation below 0.25xVCC and above 0.75xVCC but presumably the operating point is quite narrow unlike the Schmitt. With feedback it should "hunt" the operating point quite well but can I rely on that behavior over temperature?

What are some other ways to square up a 0.8V signal? Frequency will be at most 30MHz, and low parts count is critical. Also, bonus points if the circuit doesn't oscillate on its own without input, since I'd also like to have a separate instance of it as an external clock input. But if necessary I can use a schmitt inverter for that one as it doesn't need to operate down to 0.8V.

[ddavidebor]

Try what you get with an optocoupler

[HackedFridgeMagnet]

What about a fast op amp and a bit of feed forward to give hysteresis?

I had a quick look at Digikey

Here is one possibility.  ADA4860-1YRJZ-RL7

It was $1.70