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a bit of speculation on my part

Posted by Christine Tham (R) on April 20, 2007 at 23:21:46

In Reply to: You are right, Ric posted by Charles Hansen on April 20, 2007 at 17:49:08:

the BB data sheets seem a bit "coy" about exactly how DSD data is handled in the DAC.

As we know, the 1738 (and also the 179x) is a hybrid DAC consisting of multi-level for the upper 5 bits and 5th order delta sigma for the low 18 bits.

Either DSD is being piped directly to the delta sigma modulator, or (possibly) it is being partially decimated to fit into the hybrid architecture.

I suspect it could potentially be the latter (there was an early Sony white paper for the XA9000ES i think that hinted at this).

That could explain the block diagram discrepancy. Otherwise it seems silly that they haven't corrected the block diagram over several generations of DACs.

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