<DIV><BR><BR><B><I>Jay Schwichtenberg <jays@aracnet.com></I></B> wrote:
<BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">
<P>Linium,<BR><BR>I'm not experienced with the BB chips. But! I have experience with some<BR>Crystal and AKM chips. A lot of their chips have programmable options for<BR>the type of interface. Most new chips will include I2S </P>
<P>Is this the same as Phillips I2C Bus....?</P>
<P> </P>
<P>MSB or LSB first or<BR>both. Some have other interfaces also, but I2S is the standard. There is no<BR>2 starting bits either. Data is clocked with respect to the bit clock and<BR>word clock with 1 bit per clock.<BR><BR>I looked at the data sheet for the TDA part. It's obsoleted on Philips WEB<BR>site and the data sheet is pretty mininal. If you're looking at 16 bits<BR>because of cost don't. 24 bit DACs aren't that expensive. I would blow the<BR>16 bit parts off and look at 24 bit multi-bit parts. There are a number of<BR>cheap DACs out there that are targeted for multi-media. Multi-bit ones are<BR>much more tolerant of clock jitter. Biggest problem with new parts is you<BR>may not find it in a DIP package.<BR><BR>If you're stuck with the TDA or PCM you might try contacting the manufacture<BR>and see what they say about clocking it with 24 bit data.<BR><BR>Jay<BR><BR><BR>> -----Original Message-----<BR>> From: owner-synth-diy@dropmix.xs4all.nl<BR>>
[mailto:owner-synth-diy@dropmix.xs4all.nl]On Behalf Of Linium<BR>> Sent: Thursday, February 12, 2004 9:13 AM<BR>> To: diy<BR>> Subject: [sdiy] Mismatch in word length with I2S (16/24 bits), it won't<BR>> work ?<BR>><BR>><BR>> Hello,<BR>><BR>> I was reading the specs of the DIR1703, and discovered that this<BR>> puppy will<BR>> produce I2S digital out only in 24bit word.<BR>><BR>> I intended at first to use the DAC TDA1543 but the specs say it<BR>> accepts 16bits<BR>> I2S input.<BR>><BR>> Well, i am not very aware of the I2S format, but really i think<BR>> it won't work.<BR>> The I2S word is composed of 2 start bits for nothing, then the<BR>> signal is a LSB<BR>> then a MSB.<BR>><BR>> I am afraid that if a 24bits signal is received, the last byte will be<BR>> ignored, and it is the most meaningfull...<BR>><BR>> Does some have an idea about this ?<BR>><BR>> Well, i have a DAC PCM56U offered by!
TI as a
replacement, but i<BR>> will be happy<BR>> to know if I2S is notoriously available as 16 and 24 word length.<BR>><BR>> Linium<BR>><BR><BR></P></BLOCKQUOTE></DIV><p><hr SIZE=1>
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