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Old 27th November 2002, 12:58 PM   #1
sonnya is offline sonnya  Denmark
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Default PCM1792 and DSD1792 with 132dB SNR

but to get 132dB the "1792" has to deliver 9Vrms..... That's a lot

Is this the future?... higher signal level in prestage and less gain in the output stage?

Just asking!

Sonny
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Old 27th November 2002, 01:15 PM   #2
Electrons are yellow and more is better!
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The future will tell....as always! It's like MHz and GHz in clock frequency at computers. What is the functional speed difference in text editing between Word 2 and the latest version?

Anyboby who has a datasheet? It seem to be a top secret right now.
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Old 27th November 2002, 05:38 PM   #3
jwb is offline jwb  United States
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Weird. I wonder what kind of power rails this DAC wants. +/-5V or +10V or something else?
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Old 27th November 2002, 06:47 PM   #4
sonnya is offline sonnya  Denmark
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more like +/-15V i would think...say goodbye to +/-5V mixed signal devices!!!!

Sound's like sweet talk to me!!!! .... you can't get pass the noisefloor.... So you have to raise the level!

Sonny
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Old 27th November 2002, 06:51 PM   #5
sonnya is offline sonnya  Denmark
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isn't that right Nelson?!?? why should you then be able to get a dynamic range of 150dB...

Sonny
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Old 27th November 2002, 07:07 PM   #6
Electrons are yellow and more is better!
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Quote:
Originally posted by jwb
Weird. I wonder what kind of power rails this DAC wants. +/-5V or +10V or something else?
I guess you'll have wait and see. I'm also curious, very curious. Thanks Sonny for the info.
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Old 27th November 2002, 07:10 PM   #7
Electrons are yellow and more is better!
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Quote:
Originally posted by sonnya
more like +/-15V i would think...say goodbye to +/-5V mixed signal devices!!!!

Sound's like sweet talk to me!!!! .... you can't get pass the noisefloor.... So you have to raise the level!
Not impossible!

1 µV noise, 4 Vrms audio = 132 dB

Not so extreme when you think about it.
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Old 27th November 2002, 07:13 PM   #8
jwb is offline jwb  United States
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I'm all for higher voltage rails. If we get 9VRMS voltage outputs from the DAC, we have a much easier job of post-DAC filtering and line driving.

If it's 15V rails we can also use some canned superregulator circuits.
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Old 28th November 2002, 10:40 AM   #9
skaara is offline skaara  Slovenia
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Interesting, but isnt this advanced segment dac like 1738, isnt sign magnitude better?
Did they discontinued to use sign magnitude technology? Why?
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Old 2nd December 2002, 06:43 AM   #10
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Default 1792 DAC

My sense is that this DAC is just an updated PCM 1738. I bet it will run on plus 3 and plus 5 volts and do current out. Also the references to voltage out are after the I-V converter. They are probalbly stating that if you raise the output voltage, you get better dynamic range. We shall see. I will be calling them Monday and will let everyone know what they say. I hope it is a direct replacement for the 1738 because you could just swap them and get (hopefully) better sound.

Ric Schultz
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