[sdiy] SSM2164 stability

[Tom Wiltshire]

Well remembered, Neil. I'd forgotten all about that.

If Tom F. is right, there'd be plenty of scope for *increasing* the size of the cap or resistor, so if I'm using a 470pF rather than 560pF, perhaps I should up the resistor a bit to compensate.

Thanks,
Tom


On 15 Jul 2010, at 22:53, Neil Johnson wrote:

> Hi,
> 
> David G. Dixon wrote:
> 
>>> Since the SSM2164 is the topic of the week... What's the story behind
>>> the 500R / 560pF or similar at the input of the SSM2164? The datasheet
>>> states "for stable operation", and it looks like a passive 10kHz
>>> low-pass (with a zero that flattens out the attenuation after 500kHz),
>>> but why? Have you encountered any situation where it actually had a
>>> noticeable impact on the output, or in which it totally screwed the
>>> circuit when left out?
>> 
>> I just blindly put them on.  Perhaps it was a disgruntled Analog Devices
>> employee having a nasty little joke!
> 
> Tom Farrand wrote a little on this topic.  You can find his email in the synth-diy archive:
> 
> http://search.retrosynth.com/synth-diy/search/lookit.cgi?-v0808.199
> 
> Cheers,
> Neil
> --
> http://www.njohnson.co.uk
> 
> 
> 
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