Does anyone know the pin configuration for I2s - diyAudio
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Old 14th February 2012, 08:24 AM   #1
bencat is offline bencat  United Kingdom
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Default Does anyone know the pin configuration for I2s

Hello

I am using a P-1a and P-3a (modwright II) which both have the option of using an I2s input and ouput. The stock cable is not that good but no one seems to make a sensible priced replacement.

I have been able to source some 999 silver teflon coated wire and deicided to make my own replacement but I do not have any details of the pin conifguration. I think that only four pins were used and one is not but not certain.

I do remember that this may have been information already on the site and I have tried a number of searches using different words and names but have not been able to find anything.

If someone could either send me a link to the thread that has this or provide me with the details I would be very grateful .
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Old 14th February 2012, 09:01 AM   #2
bencat is offline bencat  United Kingdom
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Hi all

Thanks for those of you that have viewed this and appreciate it is a pretty specialist sort of thing. I have had a text from another contact and he has provided the following which I will list here in case anyone else needs the information .

PIN 1 : word clock
PIN 2 : bit clock
PIN 3 : audio data
PIN 4 : master clock
PIN 5 : not connected
Shield : circuit ground

This will most likely be one of those jobs that will be more fiddly than difficult but they are a real curse if you have large hands (and more pertinently fingers) . See there are some days when I wish I married a woman who can solder .
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Old 14th February 2012, 12:53 PM   #3
qusp is offline qusp  Australia
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just use quality belden copper in PTFE ethernet cable with every signal wire paired with its own ground, you want tight coupling and consistent impedance in a cable like this and it should be as short as possible, no point going to the trouble of using i2s if you use a long cable, its got terrible noise immunity and no error correction, as its meant for short length of circuit board trace, not cables. better off doing spdif properly than screwing up i2s with some half way imitation of an expensive cable that is twisted and bonded by machine to control the impedance.
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Old 17th February 2012, 07:18 PM   #4
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http://focus.ti.com/lit/an/slaa449a/slaa449a.pdf

Boky
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Old 2nd March 2012, 09:08 AM   #5
bencat is offline bencat  United Kingdom
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Default urgent please note

Please note that when making up this cable as per the advice given to me this cable did not work . I had checked that the wiring was all correct and that it was consistent .

I have now found after much searching the below picture which comes from another thread and this picture is supposed to have come from Perpetual Technology themselves .

This is the confirguration for the PT P-1a and P-3a units plus the Audio Alchemy units and for those units only. It would appear there is not standard cable configuration and these cable would not work with any other companies units such as Stello .

Please accept my apologies for getting this wrong but this was a genuine error .
Attached Images
File Type: gif i2s_pinout1.gif (17.4 KB, 237 views)
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Old 2nd March 2012, 09:37 AM   #6
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Default Audio Alchemy I2S cables

Slightly off topic for those committed to making up their own cables, but for those looking to find the original Audio Alchemy I2S cables which are the recommended standard for PT kit (noting that they are likely to be of the same indifferent quality as bencat's original), you could try contacting:

Carrie Martinez
Silicon Salvage, Inc.(ebay sellers ssinc1500)
1500 N Dale Ave.
Anaheim, CA 92801
phone: 714-523-2425
fax: 714-523-2552

SS are selling them at $4.99 each but won't ship outside the USA. UK-based people may need to ask a friend in the US to take receipt for onward transmission....

I have bought three on the basis that I will have at least one right when I try cannibalising the wire! I guess it might be worth the investment in one for testing to ensure that you are working to the correct configuration.

For a higher quality bought cable, I think Bettercables still supplies them.

Best

Peter

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Old 5th March 2012, 08:43 AM   #7
bencat is offline bencat  United Kingdom
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I do not want to post this too soon as the original cable did not work due to me getting the pin configuration wrong as in the above thread. However I have been able to find a cable maker who will make up the 5Pin mini din for the I2S lead for PT equipment using 99.9% silver cable it is Achtung Audio on E-Bay .

I will confirm how this sounds and if it works once I have the cable reconfigured and will also confirm that the wiring as per my attached diagram does indeed work. I think this would be a viable and sensible cable with costs around £35 - £40 per 0.5 metre (try and keep this cable as short as possible this is not a proper protocol for use with cable but meant to travel only very short distances through pcb track between ic chips.)

I have the original PT cable and frankly it does not even begin to show the quality f this connection a good decent coaxial with proper 75 ohm cable will sound much better and a 110 ohm XLR will sound better again. I have a Kimber I2S and that shows a real quality difference over both of the above. I expect the silver cable to be better still.

As I say too early to say but thought it better to advise this now and save anyone who was thinking of getting the standard cables from the US. They may well end up costing more than they are worth. Would also mention for the record that Russ Andrews will make up a cable for you as well and this will be very good and about a similar cost to the Achtung cable. All I need to confirm now it that the pin configuration is as the diagram shows and anyone could order one from either of the above two or any other custom cable maker.
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Old 5th March 2012, 10:54 AM   #8
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Silver cable won't do anything extra in this case. You are in digital domain, signal "works" or does not...
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Old 5th March 2012, 08:49 PM   #9
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Default Better quality I2S cable

Quote:
Originally Posted by bencat View Post
I do not want to post this too soon as the original cable did not work due to me getting the pin configuration wrong as in the above thread. However I have been able to find a cable maker who will make up the 5Pin mini din for the I2S lead for PT equipment using 99.9% silver cable it is Achtung Audio on E-Bay .

[Space save]

As I say too early to say but thought it better to advise this now and save anyone who was thinking of getting the standard cables from the US. They may well end up costing more than they are worth. Would also mention for the record that Russ Andrews will make up a cable for you as well and this will be very good and about a similar cost to the Achtung cable. All I need to confirm now it that the pin configuration is as the diagram shows and anyone could order one from either of the above two or any other custom cable maker.
I think Bencat's onto something and that a better quality cable is a good idea.

The cheap AA cable I found is nothing at all special and I am emphatically not recommending it. I mentioned the source of the AA cables simply to provide information, as AA stuff is becoming rarer and rarer, and any (correct) cable is better than none...

Whatever your views on silver cables and the "digits is digits and I use fuse wire/dental floss/old dental fillings to no sonic ill effect" arguments, presenting a proper impedance and making good connections seems worthwhile: in particular, decent shielding must be important and the mini DIN plugs AA and PT specified are fairly crappy at their best - and these AA cables are not much better than the freebies you get with cheap stereo components or computers pre-USB. Putting the question of what wire to one side, a good pair of Neutriks would make a far more secure and solid connection, for example.

Bencat's experiment is not going to break the bank (his cable will cost about a tenth of what Revelation Audio are charging for their bespoke cable, taking into account import duties and VAT) and he has offered to share his impressions with us.

I am awaiting the outcome of Bencat's experiment with interest. If negative, I suspect he will soldier on, still seeking to squeeze a bit more out of his kit some other way. If positive, we will have benefited from his research and those who are interested can then also order an extra wire with a pre-terminated end and an unterminated end and whip out their soldering irons and try to hook up the direct I2S connection from their CDPs, having, of course, digested and understood Kal's articles!

Peter
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Old 5th March 2012, 10:49 PM   #10
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Silver core does have nothing to do with "proper impedance", that one is set by geometry and insulation proprieties.
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