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Old 9th January 2003, 08:52 PM   #1
diyAudio Member
 
Join Date: Nov 2002
Location: California
Default Just got AD1955 ref board

I just received my AD1955 reference board. Very nice design overall. I'll post some pictures later.

Measurements are pretty great as well with:

THD+N measurements are typically -108.90762 +- .6dB

Non-weighted SNR is right around -117.87 dB, but has been seen as low as -118.59 dB

Non-weighted DNR is between -118dB and -119.28dB

As for the sound...sounds great to me. I'm not going to talk about "transparency" "musicality" or "fullness" as I'm not a big subscriber to those terms.
The numbers pretty much speak for themselves in my book.
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Old 9th January 2003, 09:10 PM   #2
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Join Date: Dec 2001
Location: Austin, TX
Hi,

Do you how this board does I/V conversion. Does it have balanced outputs? What are the power requirements?

Does it have any power supply on-board ripple filtering?

Sorry about the questions. I can't seem to find any on-line documentation at the Analog site. Do you have any?

Best Regards,

Dale
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Old 10th January 2003, 03:16 AM   #3
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Join Date: Nov 2002
Location: California
Quote:
Do you how this board does I/V conversion. Does it have balanced outputs? What are the power requirements?
It uses AD797s, has balanced and single ended outputs, and requires +- 12V.

Quote:
Does it have any power supply on-board ripple filtering?
Yep, it has a handful of SMT electrolytics on board.

Quote:
Sorry about the questions. I can't seem to find any on-line documentation at the Analog site. Do you have any?
It comes with a printout of the schematics and AD1955 docs. You can download the datasheet from Analog's web site:

http://www.analog.com/UploadedFiles/...45AD1955_0.pdf

I don't think the eval board schematics or docs are up there yet.
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Old 11th January 2003, 01:24 AM   #4
diyAudio Member
 
Join Date: Dec 2001
Location: Austin, TX
Hi Again,

Just hoping that you would post some pics.

Does this have switches to set modes or use a PC connection?
What input receiver does the board use or is one not needed with the 1955?

From you rlast post, I assume there is a 5V regulator on-board.

Thanks again,

Dale

P.S. I have one on order. How long did it take them to ship?
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Old 11th January 2003, 05:38 AM   #5
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Join Date: Nov 2002
Location: California
Quote:
Originally posted by harvardian
[B]

Just hoping that you would post some pics.
OK...here goes:

Click the image to open in full size.

Quote:
Does this have switches to set modes or use a PC connection?
The DAC is programmable via SPI, a few of the pins on the DB25 are used for that.

Quote:
What input receiver does the board use or is one not needed with the 1955?
For the PCM modes, it uses a CS8414. It also has a seperate input for DSD.

Quote:
From you rlast post, I assume there is a 5V regulator on-board.
Yep, it's in the north slight left of center.

Quote:
P.S. I have one on order. How long did it take them to ship?
Took a week and a bit to get here.
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Old 11th January 2003, 02:33 PM   #6
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Join Date: Dec 2001
Location: Austin, TX
A huge thanks!


Best Regards,

Dale
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Old 30th September 2005, 10:08 PM   #7
hbarki is offline hbarki  Indonesia
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Join Date: Dec 2003
Location: NoCal
I also bought one. Still have to build the power supply. What kind of power supply are you using?
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Old 1st September 2006, 01:23 AM   #8
hbarki is offline hbarki  Indonesia
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Join Date: Dec 2003
Location: NoCal
Hi,

I connected the board to +-12V. I use the SPDIF input ang RCA ouput. I did not get any sound. Is there anything I have to do to activate this board?

Thanks
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