Searching \ for '[EE]: SPDIF output advice' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/ios.htm?key=output
Search entire site for: 'SPDIF output advice'.

Exact match. Not showing close matches.
PICList Thread
'[EE]: SPDIF output advice'
2002\08\26@154339 by Robert E. Griffith

flavicon
face
I have an audio project that currently uses a CS4334 DAC to provide L/R
analog audio outputs from a digital I2S audio stream (from a STA013 mp3
decoder).  I am trying to research SPDIF digital audio to see if I could
support it as well.  I have been googling for a while, but have not found
any information on the physical line driving for SPDIF.

Does anyone know of any good links for SPDIF digital audio?

Does anyone know if there are line driver chips for SPDIF?  Or, is it simple
enough that it is done with discrete components?

Thanks,

--BobG

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics


2002\08\26@172727 by Dwayne Reid

flavicon
face
At 03:41 PM 8/26/02 -0400, Robert E. Griffith wrote:
>I have an audio project that currently uses a CS4334 DAC to provide L/R
>analog audio outputs from a digital I2S audio stream (from a STA013 mp3
>decoder).  I am trying to research SPDIF digital audio to see if I could
>support it as well.  I have been googling for a while, but have not found
>any information on the physical line driving for SPDIF.
>
>Does anyone know of any good links for SPDIF digital audio?
>
>Does anyone know if there are line driver chips for SPDIF?  Or, is it simple
>enough that it is done with discrete components?

SPDIF is a single ended (1 wire + gnd) interface with 0.5V for HI and 0V
for LO.  I generally derive my SPDIF outputs from the RS-422 driver I use
to get AES/EBU - all it needs is a 10:1 voltage divider from one of the
RS-422 outputs.  I generally use 680R & 82R for the divider resistors,
assuming a non-terminated SPDIF input.

My preferred RS-422 receiver and transmitter is the 26C31 and 26C32 quad
parts: cheap, reliable and available from many sources.

I suspect that if all that you want is a single SPDIF output, you just need
to make sure that whatever output stage you are using swings all the way to
the supply rail and then attenuate that down to 0.5V peak with a 75R source
impedance.  It *is* that simple!

dwayne

--
Dwayne Reid   <spam_OUTdwaynerTakeThisOuTspamplanet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
(780) 489-3199 voice          (780) 487-6397 fax

Celebrating 18 years of Engineering Innovation (1984 - 2002)
 .-.   .-.   .-.   .-.   .-.   .-.   .-.   .-.   .-.   .-
    `-'   `-'   `-'   `-'   `-'   `-'   `-'   `-'   `-'
Do NOT send unsolicited commercial email to this email address.
This message neither grants consent to receive unsolicited
commercial email nor is intended to solicit commercial email.

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics


2002\08\26@183840 by Dave Tweed

face
flavicon
face
"Robert E. Griffith" <.....bobKILLspamspam@spam@JUNGA.COM> wrote:
> I have an audio project that currently uses a CS4334 DAC to provide L/R
> analog audio outputs from a digital I2S audio stream (from a STA013 mp3
> decoder).  I am trying to research SPDIF digital audio to see if I could
> support it as well.  I have been googling for a while, but have not found
> any information on the physical line driving for SPDIF.
>
> Does anyone know of any good links for SPDIF digital audio?
>
> Does anyone know if there are line driver chips for SPDIF?  Or, is it simple
> enough that it is done with discrete components?

If you've got I2S, the Cirrus/Crystal chips are a popular way to get
AES/EBU or S/PDIF. See
  http://www.cirrus.com/design/products/index.cfm?c=12

The CS8405 is just a transmitter/driver. The CS8420 is a much more powerful
chip with a driver, a receiver and a sample rate converter that can be
combined in various ways.

-- Dave Tweed

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics


2002\08\27@021624 by Robert E. Griffith

flavicon
face
Dave, the CS8405A is pretty much what I am looking for.  It looks like I can
just branch off the four bit stream lines that are feeding into the CS4334
DAC into the CS8405A and both analog and digital interfaces will be active
all the time.  My only wish was that it had a lower pin count so that it
would fit into a smaller 0.05 pitch part, but I can live with it.  There's a
lot a NC pins and a lot that I will not use in my app.

Dwayne, do you typically generate the SPDIF bit stream with a uP, a DSP, or
something else?

--BobG

{Original Message removed}

2002\08\28@104438 by Robert E. Griffith

flavicon
face
I am using the CS8405 to generate the S/PDIF bitstream that Dave suggested.
I see from several sources that a transformer on the output is not required,
but is recommended for the consumer version of the digital audio interface
(S/PDIF).  Do you guys who have done this before, generally put a
transformer on the output?  If so, can you recommend a source for one?  I
have been searching digikey, and have not been able to find a small,
inexpensive, 1:1 transformer.

Thanks,

--BobG

{Original Message removed}

2002\08\28@184206 by Rob Robson

picon face
It probably doesn't meet the "inexpensive" criterion, but I've used the
Schott 67129600 that Cirrus/Crystal mentions in some of their spec sheets.
The Digi-Key part no. is 257-1025-ND, and they go for C$13.96 in singles /
9.38 ea. in tens.

Good luck!
Rob Robson

----- Original Message -----
From: Robert E. Griffith <bobspamKILLspamJUNGA.COM>
To: <.....PICLISTKILLspamspam.....MITVMA.MIT.EDU>
Sent: Wednesday, August 28, 2002 7:43 AM
Subject: Re: [EE]: SPDIF output advice


> I am using the CS8405 to generate the S/PDIF bitstream that Dave
suggested.
> I see from several sources that a transformer on the output is not
required,
> but is recommended for the consumer version of the digital audio interface
> (S/PDIF).  Do you guys who have done this before, generally put a
> transformer on the output?  If so, can you recommend a source for one?  I
> have been searching digikey, and have not been able to find a small,
> inexpensive, 1:1 transformer.
>
> Thanks,
>
> --BobG
>
> {Original Message removed}

2002\08\29@005455 by Robert E. Griffith

flavicon
face
Thanks Rob,

Those Canadian $s had me worried there.  $2.89 USD is not so bad.

--BobG

-----Original Message-----
From: pic microcontroller discussion list [EraseMEPICLISTspam_OUTspamTakeThisOuTMITVMA.MIT.EDU]On
Behalf Of Rob Robson
Sent: Wednesday, August 28, 2002 6:34 PM
To: PICLISTspamspam_OUTMITVMA.MIT.EDU
Subject: Re: [EE]: SPDIF output advice

It probably doesn't meet the "inexpensive" criterion, but I've used the
Schott 67129600 that Cirrus/Crystal mentions in some of their spec sheets.
The Digi-Key part no. is 257-1025-ND, and they go for C$13.96 in singles /
9.38 ea. in tens.

Good luck!
Rob Robson

----- Original Message -----
From: Robert E. Griffith <@spam@bobKILLspamspamJUNGA.COM>
To: <KILLspamPICLISTKILLspamspamMITVMA.MIT.EDU>
Sent: Wednesday, August 28, 2002 7:43 AM
Subject: Re: [EE]: SPDIF output advice


> I am using the CS8405 to generate the S/PDIF bitstream that Dave
suggested.
> I see from several sources that a transformer on the output is not
required,
{Quote hidden}

[RemoveMEPICLISTTakeThisOuTspamMITVMA.MIT.EDU]On
> Behalf Of Dave Tweed
> Sent: Monday, August 26, 2002 6:37 PM
> To: spamBeGonePICLISTspamBeGonespamMITVMA.MIT.EDU
> Subject: Re: [EE]: SPDIF output advice
>
> "Robert E. Griffith" <TakeThisOuTbobEraseMEspamspam_OUTJUNGA.COM> wrote:
> > I have an audio project that currently uses a CS4334 DAC to provide L/R
> > analog audio outputs from a digital I2S audio stream (from a STA013 mp3
> > decoder).  I am trying to research SPDIF digital audio to see if I could
> > support it as well.  I have been googling for a while, but have not
found
{Quote hidden}

powerful
{Quote hidden}

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listservEraseMEspam.....mitvma.mit.edu with SET PICList DIGEST in the body

--
http://www.piclist.com hint: To leave the PICList
EraseMEpiclist-unsubscribe-requestspammitvma.mit.edu


2002\08\29@030802 by john

flavicon
face
If you look in the Elektor Electronics Magazine (possibly Elektuur)
They have one which they wind from a small torroid and is easy to make.
They also give full details on the cores and where to get them !
That being said, why not go the optical route ?

On Wednesday 28 August 2002 04:43 pm, you wrote:
{Quote hidden}

> {Original Message removed}

More... (looser matching)
- Last day of these posts
- In 2002 , 2003 only
- Today
- New search...