21 Dec
2003
21 Dec
'03
2:10 a.m.
On Sun, 21 Dec 2003, Brent Hilpert wrote:
Tony Duell wrote:
The AD8612 (dual comparator) would do - it has about a 4 ns propagation delay
The AD8564 quad (a little slower at 7 ns) would reduce parts count.
The MAX 9693 (dual 1.2 ns) with ECL outputs would avoid the TTL-ECL
translator
I've made input pods for my old HP 1650 (even made a little circuit card), But
the 1650 input circuitry is in the main box, the input pods are just resistive
dividers (like a bunch of passive scope probes all together)
Peter Wallace
80ns is nowhere near fast enough!. That's about 12MHz, the analyser is a
100Msample/second unit... You want a comparator that switches in about 5ns...
(... depends on what you want to do with the analyser.)
The LM319/80nS was mentioned as a starting point, fast enough to be useful for a lot of
work, slower ones are way slower, the latest linear ref. manual that I have (National
Semi./1988) has comparators down to 20nS (with complementary outputs).
(Actually, I have a few NOS Motorola 10124 TTL->ECL translators if they are that hard
to come by and someone is desperate.)