[sdiy] Mismatch in word length with I2S (16/24 bits), it won't work ?

[Steve Allen]

Jay Schwichtenberg <jays at aracnet.com> wrote:
Linium,

I'm not experienced with the BB chips. But! I have experience with some
Crystal and AKM chips. A lot of their chips have programmable options for
the type of interface. Most new chips will include I2S 

Is this the same as Phillips I2C Bus....?

 

MSB or LSB first or
both. Some have other interfaces also, but I2S is the standard. There is no
2 starting bits either. Data is clocked with respect to the bit clock and
word clock with 1 bit per clock.

I looked at the data sheet for the TDA part. It's obsoleted on Philips WEB
site and the data sheet is pretty mininal. If you're looking at 16 bits
because of cost don't. 24 bit DACs aren't that expensive. I would blow the
16 bit parts off and look at 24 bit multi-bit parts. There are a number of
cheap DACs out there that are targeted for multi-media. Multi-bit ones are
much more tolerant of clock jitter. Biggest problem with new parts is you
may not find it in a DIP package.

If you're stuck with the TDA or PCM you might try contacting the manufacture
and see what they say about clocking it with 24 bit data.

Jay


> -----Original Message-----
> From: owner-synth-diy at dropmix.xs4all.nl
> [mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of Linium
> Sent: Thursday, February 12, 2004 9:13 AM
> To: diy
> Subject: [sdiy] Mismatch in word length with I2S (16/24 bits), it won't
> work ?
>
>
> Hello,
>
> I was reading the specs of the DIR1703, and discovered that this
> puppy will
> produce I2S digital out only in 24bit word.
>
> I intended at first to use the DAC TDA1543 but the specs say it
> accepts 16bits
> I2S input.
>
> Well, i am not very aware of the I2S format, but really i think
> it won't work.
> The I2S word is composed of 2 start bits for nothing, then the
> signal is a LSB
> then a MSB.
>
> I am afraid that if a 24bits signal is received, the last byte will be
> ignored, and it is the most meaningfull...
>
> Does some have an idea about this ?
>
> Well, i have a DAC PCM56U offered by TI as a replacement, but i
> will be happy
> to know if I2S is notoriously available as 16 and 24 word length.
>
> Linium
>





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