[sdiy] Generating a large number of CV outputs

[Jay Schwichtenberg]

You are probably going to have to have a master to set everything up and 
multiple processors to output stuff in parallel.

Figure out which interface you are going to use. Probably SPI or I2C, 
even though a lot of SPI interfaces run at 50 MHz it's going to take PCB 
rocket science to get it to work that fast.

Then pick your chips you're going to use.

Last thing is do a calculation to figure out how long it actually takes 
to do a transfer.

Jay S.

On 12/7/2023 4:35 PM, Danjel van Tijn / intellijel wrote:
> What is the current ideal way to generate a large number of CV outputs 
> from a single CPU?
>
> Let's say I wanted to generate 100 outputs with an update rate of a 
> few kHz and an equivalent bit depth of 12 or 16 bits.
>
> I know that back in the day when DACs were extremely expensive, the 
> designs would use a single DAC and then demux to a bunch of S&Hs.
>
> Now that DACs are cheaper, is it better to chain a bunch of 8- or 
> 16-channel DACs?
>
> Or would it make more sense to use an FPGA and create a giant 
> multi-channel 1-Bit DAC?
>
> Looking at some Elektron hardware teardowns it appears that they are 
> using the latter approach.
>
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