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

[mark verbos]

yeah, probably.


On Jan 26, 2009, at 1:14 PM, Tom Bugs wrote:

> 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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>