[sdiy] Suitable DACs for Demultiplexing

[Antti Huovilainen]

On Wed, 21 Oct 2009, Tom Wiltshire wrote:

> However, I ran into a problem. The DAC is a Sigma-Delta type and uses an 
> upsampling digital filter to produce a pulse train at 256 times the 
> sample frequency. What this seems to mean is that the output is 
> filtered.

This has been covered on the list a few times already. You can't easily 
multiplex a sigma-delta audio dac and neither should you.
The DAC is optimized for audio. Any control specs are irrelevant in the 
intended use, so gain, offset, temperature stability etc will vary and be 
quite poor.

Antti

"No boom today. Boom tomorrow. There's always a boom tomorrow"
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