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You are right, Ric

Posted by Charles Hansen (M) on April 20, 2007 at 17:49:08

In Reply to: don't think 1796 converts to PCM posted by Ric Schultz on April 20, 2007 at 16:19:18:

First of all, the original poster said "PCM1790", which is not even listed on the Burr-Brown (TI) website. However, Burr-Brown *did* make a PCM1790 as a custom part for some large Japanese manufacturers. As far as I know, the PCM1790 does *not* accept "DSD" data. So if the player actually uses a PCM1790, I believe that it *must* convert "DSD" to PCM. (I could be wrong about this, as I am going on memory here. I think I recall seeing a Pioneer service manual for a DVD player that used the PCM1790 and it included an abbreviated data sheet for the PCM1790.)

But assuming that the later part number of "PCM1796" is correct, this does indeed accept "DSD" data without converting it to PCM. The block diagram in the data sheet is, in fact, incorrect (as are the data sheets for all of the other Burr-Brown DAC chips that accept both PCM and "DSD" data.)

The only place I have seen a correct block diagram is in a pre-print that the Burr-Brown engineers presented at an AES convention when the PCM1738 was introduced, entitled "A 117 dB Dynamic Range Current Mode Multi Bit Audio DAC for PCM and DSD Audio Playback". In this paper, the block diagram clearly shows the "DSD" data being directly fed to the "current-segment DAC" block. (The official data sheet does *not* show this.)

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