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Old 17th November 2004, 05:33 AM   #1
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Default Deglitch output of os filter ?

Hi,

data sheets of SM5841, 5803, 5813 etc. show sample hold after dac chips, connected to deglitch output.

Is this a feature or a must ?

Better not use such old os filter ?
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Old 17th November 2004, 09:32 AM   #2
Cobra2 is offline Cobra2  Norway
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Default Also wondering

if any of these would be better?
(filter-upgrade):
http://www.audiotuning.de/english/in...1-digital.html

www.TentLabs.com also have one...

Arne K
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Old 17th November 2004, 10:32 AM   #3
Lgrau is offline Lgrau  Denmark
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Hi Bernhard

I would say it's just a feature. It's there because many of the DAC's at that time didn't contain a sample & Hold circuit.

PCM58 was the first from BB with S/H as far as I remember, if you a newer DAC there is no need to use the s/h output from the SM5841
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Old 17th November 2004, 11:19 AM   #4
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Quote:
Originally posted by Lgrau


PCM58 was the first from BB with S/H as far as I remember, if you a newer DAC there is no need to use the s/h output from the SM5841
And PCM56 ?

In datasheets of those NPC os filters applications are shown using PCM58 with external sample/hold.
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Old 17th November 2004, 10:29 PM   #5
guido is offline guido  Netherlands
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Quote:
Originally posted by Bernhard


And PCM56 ?

In datasheets of those NPC os filters applications are shown using PCM58 with external sample/hold.
From the '56 datasheet: "this means that when one pcm56 is used per channel, the need for all the sample/hold and controls circuitry associated with a single dac(two-channel) design is effectively eliminated. The pcm56 is tested to meet its thd specs without the need for output deglitching."

Are the npc datasheet showing a single dac for left/right ??

btw, did you see the offers in the trading section. there's your chance to get enough '56 or '58 for your project
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Old 17th November 2004, 11:56 PM   #6
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Bernhard, that is only needed in single dac for 2 channels, very old implementations.
Dac chips were expensive back then...
Tell you what, if you wanna see that working, I have a very old Telefunken CDP, with single PCM56 dac, switcher, deglitcher, all that technology, and everything in good working conditions.

Of course, such a rare piece of kit will cost you big $$$$$$$$$.

Note: you are going back much more than I expected.
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Old 18th November 2004, 06:21 PM   #7
Lgrau is offline Lgrau  Denmark
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Quote:
Originally posted by Bernhard


And PCM56 ?

In datasheets of those NPC os filters applications are shown using PCM58 with external sample/hold.

The Denon 3560 also uses external s/h circuit, even though it's a PCM58 DAC's inside. They probably use the datasheet for their designs

Removing the s/h in the denon3560 makes no differences to the sound, I thought it would improve by removing it.
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Old 18th November 2004, 06:23 PM   #8
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Quote:
Originally posted by carlosfm


Of course, such a rare piece of kit will cost you big $$$$$$$$$.

What`s the Model Nr. of the rare piece ?
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Old 18th November 2004, 06:34 PM   #9
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Default little bit OT

Now I wonder if it is a good idea to connect I-out of n DAC chips parallel and n op amp I/V stages parallel again.

So every I/V stage delivers the same current as it was only one DAC chip, but the DAC chips see 1/n impedance.
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Old 18th November 2004, 10:17 PM   #10
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Quote:
Originally posted by Bernhard
What`s the Model Nr. of the rare piece ?
I've spent two hours makin' holes on a case after dinner, don't make me go back to my basement again, I'm tired.
Forget it, you don't wanna know, it's a very old (and cheap-looking) Telefunken CDP.
I was joking, it isn't worth $$$$.
Maby only for you, as it has that ancient implementation, and a PCM56?
Send me a Marantz CD7, I'll send you this one.
Deal?
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