[sdiy] fost precision comparator ?

[jhaible at debitel.net]

Hi

I'm looking for a comparator for a certain application
(zero crossing detection; not synth-related), where 
I need high speed and good precision.

Requirements are < 200uV drift (offset, hysteresis)
and < 30ns jitter

I want to detect the zero crossing of a slow (10kHz)
signal with constant (1V) amplitude. Propagation
delay may be longer than 30ns (it probably will be
longer because of the flat slope / low overdrive),
and offset may also be higher than 200uV, but
the *drift* (over 1/2 hour at fairly constant tempertature)
must be < 200uV, and the *jitter* from one zero crossing
detection to the next must be <30ns.

Open collector output required, or an output stage
that can be supplied with 3V ... 5V.
Analogue part can be supplied with +/-12V dual supply
or +5V single supply.
Must haqndle 0 ... 5V input range without damage,
+1V ... +4V (operating) common mode voltage.

Does anybody make comparators like this?
Maxim and Analog Devices, don't (just talked
to their application engineers).
Anybody else making 200uV / 30ns comparators ?

JH.

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