Arny Krueger wrote:
"Stewart Pinkerton" wrote in message
On Thu, 16 Dec 2004 07:20:41 GMT, 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?
Invert pins are kinda like historical artifacts on modern audio DACs.
This goes back to no later than the acension of sigma-delta DACs which
nearly totally dominate the present market for SOTA audio DACs.
Essentially yes, and this is a classic method of averaging errors
between the two DACs.
The real problem with this proposed solution is that modern DACs are highly
deterministic and tend to lack symetrical errors.
In fact, more benefit might come from operating the op amp buffers in a
balanced configuration. Many better audio DACs have + and - outputs.
This is the topology I use. I can't recall seeing a recent serious DAC data
sheet that doesn't recommend this method.
Graham