i2s connection question - diyAudio
Go Back   Home > Forums > Source & Line > Digital Line Level

Digital Line Level DACs, Digital Crossovers, Equalizers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 24th March 2009, 03:16 PM   #1
diyAudio Member
 
Join Date: Dec 2008
Default i2s connection question

Hi all,

let me warn you first: I am fairly new to DAC design, so flame me if you must...

Here comes the question:

If i get the i2s spec right, it needs three signals to communicate (clock, word select, data). So how come, that some chips on the receiving end only use one??
So, for example if i would like to use the i2s output of an old philips cd-player chip (SAA7220) and connect that to the AK4113, would it work?

Can you suggest any further readin on the issue for me?

Cheers
Stephan
  Reply With Quote
Old 24th March 2009, 04:40 PM   #2
diyAudio Member
 
Join Date: Jan 2008
Location: Virginia
If it is i2s, there are always 3 signals. They might not be coming all from the same place, (depending which circuit it is the master and which are slaves), they might be called different, but the DAC will get those signals from somewhere .
  Reply With Quote
Old 25th March 2009, 04:23 PM   #3
pilli is offline pilli  France
diyAudio Member
 
Join Date: Aug 2006
Default Re: i2s connection question

Quote:
Originally posted by stephan-schulz
i2s ... three signals to communicate (clock, word select, data).
So how come, that some chips on the receiving end only use one??
So, for example if i would like to use the i2s output of an old philips cd-player chip (SAA7220) and connect that to the AK4113, would it work?
Can you suggest any further readin on the issue for me?
Hi Stephan,
when there is one signal, it is probably SPDIF or some of the similar formats.
You can start with wikipedia
http://en.wikipedia.org/wiki/SPDIF

Read the AK4113 datasheet carefully; looks like it has six "bi-phase" inputs (which is what SPDIF is).


The SAA7220 puts out SPDIF on pin 14 called DOBM, "biphase mark code".

If you go that way, be aware that SPDIF being a "high speed" format, it has precise requirements on the transmission medium, cable, connectors, terminations.
It's something like this: each second, 48.000 samples of 24bits for 2 channels must go through, which makes something in the 2MHz range, where radiofrequency properties of the transmission line become relevant.
(Sorry, this may be not 100% correct, but it gives an idea of things... am a beginner myself)

I think I could hear the difference between an SPDIF link using an audio RCA cable and using a proper 75ohm cable with 75ohm BNC connectors. The former works, it makes the DAC play, but the latter sounds better (wasn't an accurate careful comparison, though...)

Hope this helps a little.

Cheers.

_
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Capacitor connection question Flyin11 Car Audio 5 4th February 2009 04:20 PM
series connection question JC951t Multi-Way 2 8th November 2008 10:20 PM
Beginner Ground Connection Question TGRANT Analog Line Level 8 17th September 2006 03:46 AM
Transformer Leg Connection Question mark845 Tubes / Valves 3 6th August 2006 02:31 AM
TDA1541A Pin connection question dsavitsk Digital Source 0 6th March 2006 09:56 PM


New To Site? Need Help?

All times are GMT. The time now is 07:09 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2