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

[John Blacet]

---A trade off between aquisition time and hold time. .01 seems small for
synth work. The Improbability Drive uses a 0.1 uF mylar. Polystyrenes this
size are huge and hard to find. Seems to work pretty well though. S&H made
up with  2 stages of a MAX 365 and a TL074 op amp. Lot's of guard band
stuff in the PCB design!



> 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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-- 
John Blacet