[time-nuts] 74HC4046 receiver

Pete peterawson at earthlink.net
Thu Apr 9 00:15:51 UTC 2009

A long thread was running on various ways to process a 10MHz
(or other) sinewave to reduce measured jitter (presumably limited
by slew rate). This note is a quick look at what the 74HC4046
signal input circuit yields; since it was mentioned in 1 post as
possibly useful.

Jitter was measured on a DTS-2075 with a 0.18uf blocking cap
and a 10:1 resistive divider probe. This provided +/- 250mV into
the DTS & an AC coupled, 500 ohm load on the 4046 output.

The sinewave source was the 10MHz ref-out from a PM6681, it's
the quietest +9dBm signal available to me.

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