[time-nuts] 74HC4046 receiver
John Ackermann N8UR
jra at febo.com
Thu Apr 9 12:08:05 UTC 2009
After my experiments last weekend (which will continue...) I am
contemplating making up a simple circuit board with a Wenzel input
circuit driving a 74AC04 output, to provide a fast transition time
source that could be fed by a sine wave oscillator. I suspect the '04
output rise time is about as fast as anything that we'd reasonably
homebrew, though I'd be happy to be proven wrong (Bruce???).
I'm not considering turning this into a TAPR project, but I'll probably
end up with more PC boards than I need, so if anyone is interested in
getting a board (and sharing in the board cost), let me know.
> The jitter measurements were made via the DTS PER function.
> This looks only at CH1 & the reference is the DTS internal
> 100MHz. OXCO. DTS-2075 jitter floor is < 3ps rms.
> The Fairchild & National parts have identical datasheets &
> spec SIGin sensitivity as 133mV @ Vcc=6V. The Philips
> version specs SIGin sensitivity as 35mV @ Vcc=6V.
> Fine idea to look at delta with 2ea 'AC04s driven from a
> common source; I'll try it in the next day. Unfortunately, I
> have no low jitter (<5ps) fast transition source to properly
> drive the parts. It's still worth a look.
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