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Old 21st May 2008, 01:16 AM   #1
Filburt is offline Filburt  United States
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Default PMD100 Max Sample Rate?

I'm having some trouble getting a clear idea of what it really is. The datasheet tells me 55.2KHz but I seem to recall people using the PMD100 on projects involving higher sample rates. I may be mistaken, though, but I apparently lack the requisite search skills to definitively answer the question myself, so I'm asking here

Thanks for any help!
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Old 21st May 2008, 02:17 AM   #2
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The input sample rate would be 44.1 or 48 kHz. 55.x k is the fastest the chip will still meet specs, a bit of margin typical when writing chip specs.

The output sample rate in HW/standalone mode is 8x that, 352.8 or 384 kHz. Maybe what you were referring to...?

Regardless of specs, it is a very good sounding filter, including when playing non-HDCD material.

Enjoy,

WMS
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Old 21st May 2008, 02:26 AM   #3
Filburt is offline Filburt  United States
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Okay. Thanks for the info! It was just unclear to me what the max input was; for some reason I'd read it could take 96KHz, but I guess not. I was aware that the output was of course higher due to oversampling.

My DAC (Assemblage DAC-2.6) currently has the PMD100 in it. Seems like a great filter, overall, and the gains from HDCD appear to be significant (I used my computer to be able to block/unblock HDCD to check it, and conveniently this unit's design allows me to disable attenuation).

There is apparently a DF1704 filter available, though, for 96KHz operation. I don't know if it's worth pursuing or not.
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Old 21st May 2008, 12:54 PM   #4
mr-mac is offline mr-mac  Scotland
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The PMD100 is one of the best digital filters ever.

For 16bit you will not find a better sounding filter. The onyl reason to go for a 96Khz one would be if you plan to replay a lot of 96khz material but it won't sound as good on 44.1, 48 etc.

John
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Old 22nd May 2008, 11:23 PM   #5
rossl is offline rossl  United States
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I would like to design a board that would be a stand-alone HDCD decoder.

Does anyone know of a source of PMD100s or PMD200s?

Preferably not from China. I recently saw an ad for some from China, but it seemed suspicious. They were probably counterfeit.
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Old 22nd May 2008, 11:42 PM   #6
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Quote:
Originally posted by rossl
I would like to design a board that would be a stand-alone HDCD decoder.

Does anyone know of a source of PMD100s or PMD200s?

Preferably not from China. I recently saw an ad for some from China, but it seemed suspicious. They were probably counterfeit.

Your best bet might be to consider buying a used CD player or DAC with the chip. It's a DIP package and rather straight forward to unsolder and reuse.

THe chip has been out of production for quite a while after Microsoft bought the company and IP.


I have several HDCD disc's and an Adcom GDA750 Balanced DAC that supports HDCD. The sound from the HDCD disc's is nothing short of awesome. Even my non-audiophile friends readily prefer the HDCD version of Yes's 90125 to the remastered release.

Sad HDCD never really caught on and moved forward.

-David
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Old 23rd May 2008, 12:57 AM   #7
rossl is offline rossl  United States
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Quote:
Originally posted by dw8083



Your best bet might be to consider buying a used CD player or DAC with the chip. It's a DIP package and rather straight forward to unsolder and reuse.

Yes, I have one. It's an Parasound from the 90's. It's hardly worth it to design a PCB just for one chip. It will need a micro to control the PMD chip and a CPLD to reformat the output into I2S.

What I really want is 10 or 20 PMD chips so I can build a lot of them.
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Old 23rd May 2008, 04:30 AM   #8
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Default Geniune parts

A functional PMD-100 would be very hard to fake, you could immediately tell if the HDCD flag does not respond.
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