I'm in the final phase of securing a DAC I've wanted for some time that uses 4 PCM1702 20-dip chips per channel.
So, I'm a mechanical guy, and all this digital stuff is giving me a headache.
I have found that the manufacturer used the PCM1702, whereas some companies used the PCM1702U, others the PCM1702J, and I could type for a while, but what is the difference between the chips.
I found some original prices on the net that seem to indicate that the K, U-K, and the U were more expensive - does this equate to better SNR? Is it an indicator of better QA techniques and mean that these chips are better matched?
Thanks in advance.
So, I'm a mechanical guy, and all this digital stuff is giving me a headache.
I have found that the manufacturer used the PCM1702, whereas some companies used the PCM1702U, others the PCM1702J, and I could type for a while, but what is the difference between the chips.
I found some original prices on the net that seem to indicate that the K, U-K, and the U were more expensive - does this equate to better SNR? Is it an indicator of better QA techniques and mean that these chips are better matched?
Thanks in advance.
Hi Audio39
Some hints there : http://www.ti.com/lit/ds/symlink/pcm1702.pdf
Maybe the answer is here...
Some hints there : http://www.ti.com/lit/ds/symlink/pcm1702.pdf
Maybe the answer is here...
Attachments
I suppose the chips will work. Its just a question of k grade or regular grade.
Good point. Theres little to lose. The chip on the right has a red dot in the right place and a date code that's believable too. Its also believable the SOIC PCM1702 are in abundance on the surplus market as manufacturers mainly seemed to use the DIP PCM1702 in commercial quantities.
in the attachments various imprints of PCM1702.
Are there the risk of fakes ?
Where is a trusted delivery source resp. ordering address ?
Are there the risk of fakes ?
Where is a trusted delivery source resp. ordering address ?
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PCM1702.png348.8 KB · Views: 178
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PCM1702-6605.jpg57.8 KB · Views: 212
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PCM1702P-K.jpg26.6 KB · Views: 137
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PCM1702-PCM1702P-K-PCM1702P-Original-new.jpg_220x220q90.jpg12.8 KB · Views: 357
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pcm1702P-K-II.jpg21.9 KB · Views: 248
I'm looking for these as well, for the repair of a customer's Wadia 27 DAC.
The DAC has a combination of PCM1702U-J and PCM1702U-K chips with their outputs in parallel. The failed chip is a -J part (white dot).
Naturally these are seriously obsolete now and all I see are what appear to be knock-off variants. Hopefully it is possible to find a real one these days!
The DAC has a combination of PCM1702U-J and PCM1702U-K chips with their outputs in parallel. The failed chip is a -J part (white dot).
Naturally these are seriously obsolete now and all I see are what appear to be knock-off variants. Hopefully it is possible to find a real one these days!
I snapped a photo of the original ICs in this DAC. The paint spots are more centered on the chip rather than sitting right near pin 10. EDIT: The crusty mess on the chips is the adhesive from the copper foil which I've peeled away for inspection.
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Rochester has those, you'd have to contact them for the exact type they have. Cheaper than I thought:
Rochester Electronics (en-US)
: Part PCM1702
Another good place is chip1stop.com
All via RFQ, but a lot of choice, even K-versions.
Search result of Pcm1702 | Mail order site of electronic parts / semiconductor - chip one stop
Rochester Electronics (en-US)
: Part PCM1702
Another good place is chip1stop.com
All via RFQ, but a lot of choice, even K-versions.
Search result of Pcm1702 | Mail order site of electronic parts / semiconductor - chip one stop
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