post RMCK divider with the CS8416

bocka · 23rd August 2005, 03:20 PM

Has anybody tried to use a RMCK clock divider to connect a DF1706 (or similar) digital filter to the CS8416? The CS8416 Rev. E errata says that the 128 x fs option for the RMCK is not working correctly for datecodes later than 0415. When using a DF1706 digital filter 256 * fs cannot be used on 192 kHz sampling rates, because this leads to RMCK signals of 49 MHz which is off the specs.

My idea is to use a post RMCK divider by two in order to obtain the 128 * fs RMCK signal. Has anyone tried this before?

Sabas · 24th August 2005, 09:03 AM

The S1 switch watches gives that possibility you. He explains it in the text and the scheme.

http://www.cirrus.com/en/pubs/rdData...DB4351_DB3.pdf

bocka · 25th August 2005, 09:10 AM

Hi Sabas,

unfortunately not. The Errata of the CS8416 says:

"Parts with a manufacturing date code of 0415 or after will not output a proper clock on RMCK when the RMCK output frequency is set to be 128*Fs. Parts with a manufacturing date code before 0415 will output a proper clock on RMCK when the RMCK output frequency is set to be 128*Fs. All parts will output a proper clock on RMCK when the RMCK output frequency is set to be 256*Fs."

My part has a date code of 0451, so I'm not able to obtain sampling frequencies higher than 96kHz when using the DF1706...

So I thought about the solution of using a RMCK post divider by two

23rd August 2005, 03:20 PM	#1
bocka diyAudio Member Join Date: Jul 2003 Location: Hannover	post RMCK divider with the CS8416 Has anybody tried to use a RMCK clock divider to connect a DF1706 (or similar) digital filter to the CS8416? The CS8416 Rev. E errata says that the 128 x fs option for the RMCK is not working correctly for datecodes later than 0415. When using a DF1706 digital filter 256 * fs cannot be used on 192 kHz sampling rates, because this leads to RMCK signals of 49 MHz which is off the specs. My idea is to use a post RMCK divider by two in order to obtain the 128 * fs RMCK signal. Has anyone tried this before?

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24th August 2005, 09:03 AM	#2
Sabas diyAudio Member Join Date: Dec 2004 Location: Bilbao	The S1 switch watches gives that possibility you. He explains it in the text and the scheme. http://www.cirrus.com/en/pubs/rdData...DB4351_DB3.pdf

25th August 2005, 09:10 AM	#3
bocka diyAudio Member Join Date: Jul 2003 Location: Hannover	Hi Sabas, unfortunately not. The Errata of the CS8416 says: "Parts with a manufacturing date code of 0415 or after will not output a proper clock on RMCK when the RMCK output frequency is set to be 128Fs. Parts with a manufacturing date code before 0415 will output a proper clock on RMCK when the RMCK output frequency is set to be 128Fs. All parts will output a proper clock on RMCK when the RMCK output frequency is set to be 256*Fs." My part has a date code of 0451, so I'm not able to obtain sampling frequencies higher than 96kHz when using the DF1706... So I thought about the solution of using a RMCK post divider by two

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