[sdiy] modern AD/DA chips?

Andre Majorel aym-htnys at teaser.fr
Wed May 6 09:47:07 CEST 2009


On 2009-05-05 16:15 -0700, Tom Arnold wrote:
> On Tue, May 05, 2009 at 11:54:21PM +0100, Tom Wiltshire wrote:

> > http://www.cirrus.com/en/products/
> 
> no Industrial DACs and the error on the audio stuff is as
> expected, fairly poor.  Find for audio, but not for precision CV
> stuff.

Sorry to barge in like this, but...

To achieve 1 cent precision over 10 octaves, the error needs to be
below 1/12000 = 8.33E-05.

The CS4398 is supposed to have a THD + noise of -107 dB. Doesn't
that imply that the error is at 10**(-107/20) = 4.47E-06 ? If so,
that part is 18 times as precise as you need it to be.

Am I missing something ?

-- 
André Majorel <URL:http://www.teaser.fr/~amajorel/>



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