I2S -> SPDIF conversion

SteveCarr · 7th February 2008, 02:17 AM

Hi there,

I would like to build a combined microphone pre-amp and ADC to output to SPDIF.

I can find lots of nice ADC chips but they all output I2S and not SPDIF so I need a converter to go from I2S to SPDIF.

Does anybody have any idea what the part number is and where I could get one from? (I am in the UK).

Also any advice on my project would be welcome.

Regards

Steve

quantran · 7th February 2008, 03:46 AM

This IC may fit your need:

http://uk.farnell.com/jsp/Semiconduc...sp?sku=4293319

b-square · 7th February 2008, 04:33 AM

http://www.akm.com/category.asp?cat=spdif
http://www.cirrus.com/en/products/pro/techs/T4.html

etc, etc...SPDIF transmitter.

Pulse-R · 7th February 2008, 11:19 AM

The Wolfson WM8804 works very well.
http://www.diyaudio.com/forums/showt...38#post1356438

error401 · 7th February 2008, 11:30 AM

May as well throw TI's part in the ring for them: DIT4192.

SteveCarr · 7th February 2008, 02:17 PM

Many thanks for the fast replies I am very appreciative. I will have a look at all of the suggestions you have made.

I guess a low noise that the pre-amp on its own is not so hard to make but I guess it gets harder when it will be fed from the same battery as the didgital part of the circuit which has potential to introduce noise.

Any further advice about this and the pre-amp part would be appreciated.

Many thanks

Steve

error401 · 7th February 2008, 02:32 PM

It shouldn't be too hard. Here are some ideas you should follow for an I2S ADC anyway.

- use ground planes, on the top layer, with a separate plane for digital and analog sections, connected at a single point
- use separate regulators for analog and digital supplies
- use ample supply decoupling
- make sure your layout doesn't create any current loops that could pick up interference

These recommendations are probably in your ADC's datasheet anyway.

audiosteve · 7th February 2008, 02:46 PM

There is also the Cirrus CS8406 and CS8427. A transmitter and a receiver. They also make the CS8420 which is a transceiver with built in SRC. I've used the CS8420 and it works very well but it has a weird property where it can not transmit unless it has first received something with which to jump start the clocks. I'm ot sure if they have fixed this since I used the part a few years back.

http://www.cirrus.com/en/products/pro/techs/T4.html

Lucifix · 7th February 2008, 07:13 PM

   Hello,
you may also use SRC4392 (or SRC4382). It have SPDIF Receiver / Transmitter & ASRC + two bidirectional digital audio ports (easely configurable to I2S)... but you need a controller to fire up this thing. There is No hardware mode. Mail me if you are interested in C code.
  cheers!

7th February 2008, 02:17 AM	#1
SteveCarr diyAudio Member Join Date: Feb 2008	I2S -> SPDIF conversion Hi there, I would like to build a combined microphone pre-amp and ADC to output to SPDIF. I can find lots of nice ADC chips but they all output I2S and not SPDIF so I need a converter to go from I2S to SPDIF. Does anybody have any idea what the part number is and where I could get one from? (I am in the UK). Also any advice on my project would be welcome. Regards Steve

7th February 2008, 03:46 AM	#2
quantran diyAudio Member Join Date: Apr 2004 Location: Hanoi	This IC may fit your need: http://uk.farnell.com/jsp/Semiconduc...sp?sku=4293319 __________________ Quan Tran

7th February 2008, 11:19 AM	#4
Pulse-R diyAudio Member Join Date: Mar 2005 Location: Melbourne	The Wolfson WM8804 works very well. http://www.diyaudio.com/forums/showt...38#post1356438 __________________ Digital is only on or off

7th February 2008, 11:30 AM	#5
error401 diyAudio Member Join Date: Mar 2007	May as well throw TI's part in the ring for them: DIT4192. __________________ http://audio.gotroot.ca/

7th February 2008, 02:32 PM	#7
error401 diyAudio Member Join Date: Mar 2007	It shouldn't be too hard. Here are some ideas you should follow for an I2S ADC anyway. - use ground planes, on the top layer, with a separate plane for digital and analog sections, connected at a single point - use separate regulators for analog and digital supplies - use ample supply decoupling - make sure your layout doesn't create any current loops that could pick up interference These recommendations are probably in your ADC's datasheet anyway. __________________ http://audio.gotroot.ca/


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7th February 2008, 04:33 AM	#3
b-square diyAudio Member Join Date: Feb 2004 Location: Seattle, WA	http://www.akm.com/category.asp?cat=spdif http://www.cirrus.com/en/products/pro/techs/T4.html etc, etc...SPDIF transmitter.

7th February 2008, 02:17 PM	#6
SteveCarr diyAudio Member Join Date: Feb 2008	Many thanks for the fast replies I am very appreciative. I will have a look at all of the suggestions you have made. I guess a low noise that the pre-amp on its own is not so hard to make but I guess it gets harder when it will be fed from the same battery as the didgital part of the circuit which has potential to introduce noise. Any further advice about this and the pre-amp part would be appreciated. Many thanks Steve

7th February 2008, 02:46 PM	#8
audiosteve diyAudio Member Join Date: May 2004 Location: Niwot, CO	There is also the Cirrus CS8406 and CS8427. A transmitter and a receiver. They also make the CS8420 which is a transceiver with built in SRC. I've used the CS8420 and it works very well but it has a weird property where it can not transmit unless it has first received something with which to jump start the clocks. I'm ot sure if they have fixed this since I used the part a few years back. http://www.cirrus.com/en/products/pro/techs/T4.html __________________ Nihilism is best done by professionals.

7th February 2008, 07:13 PM	#9
Lucifix diyAudio Member Join Date: Nov 2004 Location: Suceava	Hello, you may also use SRC4392 (or SRC4382). It have SPDIF Receiver / Transmitter & ASRC + two bidirectional digital audio ports (easely configurable to I2S)... but you need a controller to fire up this thing. There is No hardware mode. Mail me if you are interested in C code.   cheers! __________________ www.luckit.biz "The Universe speaks in many languages but only one voice.[...]It speaks in the language of hope. It speaks in the language of trust. It speaks in the language of strength and the language of compassion. It is the language of the heart and the language of the soul. But always it is the same voice. It is the voice of our ancestors speaking through us and the voice of our inheritors waiting to be born. It is the small, still voice that says: we are one!" (G'Kar)

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