I have a differential clock signal coming from an IC. If the signal is present, I need a TTL "high" to enable a high-side FET driver. When certain conditions are violated, the IC will send the differential signal to ground which will disable the driver and the FET will turn off.
The issue is turning the clock signal into a logic high and also getting a logic low when the signal is sent to ground. I had the thought of comparing the output signal with the clock through a differential amplifier, but I feel that might be too susceptible to noise - especially considering the application is for an electric vehicle. Is there an easier way to do this?
Tl;dr: I need a logic high if the clock is present and a logic low if it is not.