Deglitch output of os filter ?

[Bernhard]

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 ?

 

[Cobra2]

Also wondering

if any of these would be better?
(filter-upgrade):
http://www.audiotuning.de/english/index.html?1-51-digital.html

www.TentLabs.com also have one...

Arne K

 

[Lgrau]

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

 

[Bernhard]

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.

 

[guido]

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

 

[carlosfm]

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.

 

[Lgrau]

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.

 

[Bernhard]

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

What`s the Model Nr. of the rare piece ?

 

[Bernhard]

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.

 

[carlosfm]

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?