OS filter Problem

Bernhard · 24th April 2005, 11:58 AM

Hi,

in my PCM53 project with SM5803 & DENON chip for data conversion I have a problem.

The SM5803 datasheet from the web is incomplete, page 130 is missing.
SM5803 unfortunately has a seriel input register with 13 flags to set output data word length etc.
Now I have no idea how to input the data to set those flags, this information is on the missing page.

Any other OS filter I can use ?

I need

20 bit output
output COB
left and right data parallel out
4 x OS

Or can I go directly zero OS from CS8412 to the DENON chips ?
There I need bitclock, wordclock, data left, data right.

rfbrw · 24th April 2005, 02:02 PM

What is the point of sending 20 bit data to a 16bit dac ?

gmarsh · 24th April 2005, 02:20 PM

I can't find any other parallel-output, 4X digital filters.

You could use something like a DF1706 in 4X mode, followed by a CPLD doing serial->parallel conversion, as discussed in the "elegant way to feed..." thread.

Bernhard · 24th April 2005, 03:13 PM

Quote:

Originally posted by rfbrw
What is the point of sending 20 bit data to a 16bit dac ?

The DENON chip only accepts 20 bit, otherwise there is noise only.

It works with the SM5813 but it is 8 x OS and in the datasheet the PCM53 is only specified to work on 4 x OS.

Also again I have the positive and negative spikes ( very close to each other ) on every zero crossing of the 1kHz signal..

No deglitching or filtering yet, just measured on the output pin of the PCM53.

Bernhard · 24th April 2005, 03:16 PM

Quote:

Originally posted by gmarsh
I can't find any other parallel-output, 4X digital filters.

You could use something like a DF1706 in 4X mode, followed by a CPLD doing serial->parallel conversion, as discussed in the "elegant way to feed..." thread.

Sorry, not parallel bits, just one pin for left and another for right channel data.
What I do not need is alternating l/r data output.

Bernhard · 24th April 2005, 04:09 PM

There must be a big bug.

Pictures show -60dB and -80dB 1 kHz signal.
-80 dB already looks like a square

Wrong data format ?

I had exactly the same problem or even worse when fitting the PCM53 in a JVC player whitch originally has PCM54 DAC.

Edit:

If you look closer, you can see the square from -80dB also in the -60dB signal.

rfbrw · 24th April 2005, 04:51 PM

Why not just build a jig for the purpose of testing? Unless you are testing a dac in its intended design, the odds are you will need some added logic.

rfbrw · 24th April 2005, 04:54 PM

Quote:

Originally posted by Bernhard

<snip>
when fitting the PCM53 in a JVC player whitch originally has PCM54 DAC.
<snip>

Why?

Jocko Homo · 24th April 2005, 04:55 PM

According to my data sheet, for 4X parallel mode, you set the OMD flag H. and the 8X output (pin 5) H also. Is that any help?

Jocko

Bernhard · 24th April 2005, 06:54 PM

Quote:

Originally posted by rfbrw

Why?

The old story: I don`t have a 2 x PCM 53 player to test how one chip per channel performs.

24th April 2005, 11:58 AM	#1
Bernhard diyAudio Member Join Date: Apr 2002 Location: Munich	OS filter Problem Hi, in my PCM53 project with SM5803 & DENON chip for data conversion I have a problem. The SM5803 datasheet from the web is incomplete, page 130 is missing. SM5803 unfortunately has a seriel input register with 13 flags to set output data word length etc. Now I have no idea how to input the data to set those flags, this information is on the missing page. Any other OS filter I can use ? I need 20 bit output output COB left and right data parallel out 4 x OS Or can I go directly zero OS from CS8412 to the DENON chips ? There I need bitclock, wordclock, data left, data right.

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24th April 2005, 02:02 PM	#2
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	What is the point of sending 20 bit data to a 16bit dac ?

24th April 2005, 02:20 PM	#3
gmarsh diyAudio Member Join Date: Apr 2004 Location: Halifax, NS, Canada	I can't find any other parallel-output, 4X digital filters. You could use something like a DF1706 in 4X mode, followed by a CPLD doing serial->parallel conversion, as discussed in the "elegant way to feed..." thread.

24th April 2005, 04:09 PM	#6
Bernhard diyAudio Member Join Date: Apr 2002 Location: Munich	There must be a big bug. Pictures show -60dB and -80dB 1 kHz signal. -80 dB already looks like a square Wrong data format ? I had exactly the same problem or even worse when fitting the PCM53 in a JVC player whitch originally has PCM54 DAC. Edit: If you look closer, you can see the square from -80dB also in the -60dB signal.

24th April 2005, 04:51 PM	#7
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	Why not just build a jig for the purpose of testing? Unless you are testing a dac in its intended design, the odds are you will need some added logic.

24th April 2005, 04:55 PM	#9
Jocko Homo Banned Join Date: Feb 2002 Location: As far from the NOSsers as possible	According to my data sheet, for 4X parallel mode, you set the OMD flag H. and the 8X output (pin 5) H also. Is that any help? Jocko

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