[sdiy] Consider this DAC

[ASSI]

On Saturday 13 March 2010, Antti Huovilainen wrote:
> Surely achieving < 1mV (for max 5V signal) noise floor and drift
> can't be quite that hard?

I think you need to calculate that again... for a fullscale signal of 
+-14V the DAC in question has a resolution of better than 28µV and if 
you use it at +-5V fullscale you're down to ten microvolt (by 
definition of "ppm").

For one cent resolution at 1V/octave you'd only really need a 
resolution of 0.8mV, so for 10V fullscale a 14bit DAC is good enough,  
plus they are quite a bit cheaper per channel.
 
> Plus of course there's the thing where you want higher resolution
> than accuracy to avoid stepping even if you don't particularly
> care if your filter cutoff is off by a 2 cents.

If you want resolution but not precision - go delta-sigma.  This DAC 
is for DC accuracy and yes, it will be hard to keep that precision 
throughout the complete signal chain.


Achim.
-- 
+<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk Blofeld]>+

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