PCM1792 and DSD1792 with 132dB SNR

sonnya · 27th November 2002, 12:58 PM

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

peranders · 27th November 2002, 01:15 PM

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.

jwb · 27th November 2002, 05:38 PM

Weird. I wonder what kind of power rails this DAC wants. +/-5V or +10V or something else?

sonnya · 27th November 2002, 06:47 PM

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

sonnya · 27th November 2002, 06:51 PM

isn't that right Nelson?!?? why should you then be able to get a dynamic range of 150dB...

Sonny

peranders · 27th November 2002, 07:07 PM

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.

peranders · 27th November 2002, 07:10 PM

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.

jwb · 27th November 2002, 07:13 PM

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.

skaara · 28th November 2002, 10:40 AM

Interesting, but isnt this advanced segment dac like 1738, isnt sign magnitude better?
Did they discontinued to use sign magnitude technology? Why?

Ric Schultz · 2nd December 2002, 06:43 AM

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

27th November 2002, 12:58 PM	#1
sonnya diyAudio Member Join Date: Oct 2001 Location: Denmark	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

27th November 2002, 01:15 PM	#2
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	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. __________________ /Per-Anders (my first name) or P-A as my friends call me

2nd December 2002, 06:43 AM	#10
Ric Schultz diyAudio Member Join Date: Mar 2002 Location: Boulder Creek, CA	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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27th November 2002, 05:38 PM	#3
jwb diyAudio Member Join Date: Mar 2002 Location: San Francisco, USA	Weird. I wonder what kind of power rails this DAC wants. +/-5V or +10V or something else?

27th November 2002, 06:47 PM	#4
sonnya diyAudio Member Join Date: Oct 2001 Location: Denmark	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

27th November 2002, 06:51 PM	#5
sonnya diyAudio Member Join Date: Oct 2001 Location: Denmark	isn't that right Nelson?!?? why should you then be able to get a dynamic range of 150dB... Sonny

27th November 2002, 07:13 PM	#8
jwb diyAudio Member Join Date: Mar 2002 Location: San Francisco, USA	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.

28th November 2002, 10:40 AM	#9
skaara diyAudio Member Join Date: Jun 2002 Location: Europe, Slovenia	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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