I am trying to accomplish the following:
I have a laser that outputs a sync signal from a photodiode in the cavity at 82 MHz. The signal is TTL, I think about 2 ns in width. I have a digital I/O PCI card that I would like to gate on this photodiode signal. The problem is that the card can only be gated up to 2.5 MHz.
We can just work at 2.5 MHz gating, and ignore all of the other events, provided that we can just divide down the 82 MHz input. The division should be rather accurate, so that we can continue to gate accurately despite any phase shifts in the sync signal.
I have had trouble finding IC frequency dividers that work in this frequency and voltage range (output a 4-5 V signal that we need for gating). Can anyone suggest an IC or other solution?
I have a laser that outputs a sync signal from a photodiode in the cavity at 82 MHz. The signal is TTL, I think about 2 ns in width. I have a digital I/O PCI card that I would like to gate on this photodiode signal. The problem is that the card can only be gated up to 2.5 MHz.
We can just work at 2.5 MHz gating, and ignore all of the other events, provided that we can just divide down the 82 MHz input. The division should be rather accurate, so that we can continue to gate accurately despite any phase shifts in the sync signal.
I have had trouble finding IC frequency dividers that work in this frequency and voltage range (output a 4-5 V signal that we need for gating). Can anyone suggest an IC or other solution?