[sdiy] Digital ADSR - perceivable staircase?

[Matthew Smith]

Quoth Stewart Pye at 16/02/11 07:04...
> As Tom has said if you use a 12 bit DAC like the MCP4921 for about $2 
> then your problem should disappear, as long as your look up table is 
> wide enough or you use interpolation. Micros with enough flash ROM to 
> hold a 12 bit wide table aren't that expensive and would be the simplest 
> way to do it.

Hmm - I'd only been looking at parallel-load DACs, which is why they 
were on my Expensive List. Didn't realise serial-load was *that* much 
cheaper.

> If you use AVR processors you could use an XMEGA with 12 bit DAC and 
> enough ROM for your lookup table.

I do. That could well be worth it for the effort of having an extra 3.3V 
regulator on board!


-- 
Matthew Smith

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