[sdiy] How droopy is too droopy in a S & H?

[Tom Bugs]

Just a thought, but I'd imagine that engineer desires for sample and 
hold would be over much shorter times than those for synthy people.
So, I'd have thought that 2mV per second would be a decent figure for 
'general' use though much less so for 'our' use?!

mark verbos wrote:
> I have been seduced by the Analog Devices SMP04 quad sample and hold 
> chip. It has 4 independent S&H circuits with built in capacitors, in a 
> 16 pin chip. I claims a "low droop rate" of 2 mV per Second. Doesn't 
> that seem like a lot? How much does a normal sample & hold droop? How 
> much does an LF398 with polystyrene caps droop? Is this a waste of 
> time and money? The AD684 seems to be about 10 time better, but also 
> $50! It's hard to tell because they don't use the same units for 
> measuring the specs on all the chips...
>
>
> Mark
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