"Colin B." wrote in message
In rec.audio.tech R wrote:
Stewart Pinkerton wrote in
:
On Wed, 15 Dec 2004 22:45:20 GMT, "Rich.Andrews"
wrote:
"Arny Krueger" wrote in
news:QN2dnU2d2-ywhV3cRVn- :
"R" wrote in message
. 1
I am looking for an sound card that features dual DA converters
in parallel. Does anyone know of one?
Please explain more precisely what you mean.
Arny,
What I mean by parallel is that the data stream for one channel
feeds 2 dacs at once and the resultant output of the dacs are tied
together. Many of the high end CD players and D-A units use that
circuit topology as it lowers the distortion levels.
You don't mean parallel, you mean a differential pair. Given that
distortion levels with conventional DACs can be 0.001% or less, do
you think this is important?
I don't think i mean a differential pair. Wuld not a differential
pair be 2 dacs fed with the same source but one dac has it's invert
pin asserted?
Can someone tell me what the difference is here?
Summing the output of two DACs should give "s1 + s2".
A differential pair, as I understand it, would be "s1 - (-s2)"
I don't see a difference. Am I missing something?
Your algebra is correct for a simpler case, but it ignores the inversion of
the digital input, and the effect of that inversion on distortion.