[sdiy] Quantizer project.. incoming CV's switching point to change to quantized output CV's ...

Jay Schwichtenberg jschwich53 at comcast.net
Wed Jul 7 20:50:03 CEST 2021


Very simple solution for this.

Just like for a regular VCO have a course and fine tune DAC, maybe 12-14 
bits for the course and 8-10 bits for the fine. Just make sure they are 
decent DACs, especially that they are linear.

Timing as far as writing both values shouldn't be a problem. One 
solution if you think it might would be use a dual DAC for both that has 
a sync function (output values and then send command to load the DACs 
simultaneously).

Jay S.

On 7/6/2021 10:19 PM, Brian Willoughby wrote:
> In order to hit 701.995 cents, I assume you'll need a resolution of 0.005 cents on your DAC. If I'm doing the math correctly, that requires an 18-bit DAC, and I don't know any with DC output. That's just for 1 octave of range. If you want 5 octaves of range, you'll need a 20-bit DAC.
>
> Are you talking about a practical design, Mike?
>
> I know that 20-bit ADC and DAC were a thing before 24-bit delta-sigma, but I never went looking before. The first 18-bit DAC I found only guarantees 12-bit accuracy, but at least it's monotonic. I suppose one could spend more than $10 to get better accuracy.
>
> Brian
>
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