[sdiy] Filter cut off DAC

[paula at synth.net]

Cheater00 makes a good point.

Brian, would you care to give the INL and DNL figures for the 16bit DAC 
used in 1981?
I somehow suspect that these days a 12bit DAC, even a reasonably priced 
one, would have a better INL and DNL than the DAC from 1981.


On 2018-05-22 05:19, cheater00 cheater00 wrote:
> Unless for the same price you get a really good and stable 12 bit DAC,
> or a pretty crappy 16 bit DAC.
> 
> On Tue, May 22, 2018 at 4:56 AM,  <rsdio at audiobanshee.com> wrote:
>> Prophet 5 Rev 2: 7-bit … not enough (really disappointing steps when 
>> turning CUTOFF)
>> Prophet 5 Rev 3: 16-bit … why not?
>> 
>> Personally, I can’t see designing something in 2018 that’s less 
>> capable than something from 1981.
>> 
>> I would avoid 24-bit because the DAC technology for 24-bit converters 
>> doesn’t exactly produce a DC output. I believe that all of the 24-bit 
>> converters have some amount of processing (and latency) on the samples 
>> that go through. Plus, there’s the fact that nobody can make an analog 
>> circuit with 144 dB of signal to noise performance anyway.
>> 
>> In contrast, you can get 14-bit and 16-bit DAC chips that are direct 
>> conversions without the latency or manipulation of processing.
>> 
>> Brian
>> 
>> 
>> On May 21, 2018, at 7:53 AM, paula at synth.net wrote:
>>> Random question,
>>> 
>>> How many bits is "enough" for controlling the filter cut off on a 
>>> VCF?
>>> I would start with say 12, but would 16 be better? or 24?
>>> At some point there's a cost trade off.
>>> 
>>> Thoughts?
>> 
>> 
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