DAC accuracy

[Fraser, Colin J]

> -----Original Message-----
> From: Tony Allgood [mailto:oakley at techrepairs.freeserve.co.uk]
> Sent: 09 March 1999 16:47
> To: synth diy
> Subject: DAC accuracy
> 
> 
> The DAC-08 is available in higher spec'd types. If you do use 
> the DAC-08
> use this part. The ordinary dac-08 is only 1/2LSB accurate. Clock it
> with a counter and look at those errors. Even if you use just seven or
> six bits those errors are audible in a polyphonic system, and 
> are easily
> measurable with a cheap voltmeter. If you set it up for 83mV per note
> and are using the 7 top bits, then one LSB represents half of 
> this. Half
> of that, ie. the spec'd error, will be +/-20.75mV. This is a goodly
> proportion of what you are trying to get within 0.2% to.

Well... I didn't use a DAC-08. Maybe they suck...
For the sake of arguement, I will record one of my monosynths playing a
scale (using a nasty 8 bit based cv convertor) against a dco based synth,
and upload the file to my web page.

Colin f