How to calculate fs bit clock knowing crystal frequency?
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 25th April 2012, 06:30 PM #1 merlin el mago diyAudio Member     Join Date: Sep 2009 Location: Catalonia - Europe How to calculate fs bit clock knowing crystal frequency? How to calculate fs bit clock knowing crystal frequency?
 25th April 2012, 07:21 PM #2 TheGimp   diyAudio Member     Join Date: Aug 2009 Location: Johnson City, TN According to the data sheet for the WM8741, the crystal frequency is fs. fs/divide ratio (32, 64, 128, 256, etc) gives the data rate. eg. 24.576ZMHz clock /256(divide ratio) = 192KHz data rate. I suspect it is dependent on the DAC. What device are you using?
 25th April 2012, 08:17 PM #3 merlin el mago diyAudio Member     Join Date: Sep 2009 Location: Catalonia - Europe My device have a clock of 16.9344MHz, wich fs have?
 25th April 2012, 09:16 PM #4 Ken Newton   diyAudio Member     Join Date: Apr 2003 Location: Eastern Pennsylvania The bitclock (BCLK) frequency can be calculated as follows below. 1. If the left and right channel data are in multiplexed serial format (such as they typically are before entering an oversampling interpolator) then: BLCK = original input sample rate (Fs) * the oversampling ratio * 64 bits per frame. 2. If the left and right channel data are in de-multiplexed parallel format (such as they typically are after exiting an oversampling interpolator), then: BCLK = the original input sample rate (Fs) * the oversampling ratio * 32 bits per frame. For points in the DAC where oversampling has not been applied, the oversampling ratio in the above formulas = 1. Note: There also is a rarely utilized de-multiplexed parallel 16 bits per frame I2S data format. Last edited by Ken Newton; 25th April 2012 at 09:29 PM.
 25th April 2012, 10:33 PM #5 merlin el mago diyAudio Member     Join Date: Sep 2009 Location: Catalonia - Europe Still don't know how to calculate?
 27th April 2012, 04:57 PM #6 merlin el mago diyAudio Member     Join Date: Sep 2009 Location: Catalonia - Europe Anybody can help me?
 27th April 2012, 05:04 PM #7 TheGimp   diyAudio Member     Join Date: Aug 2009 Location: Johnson City, TN What is your crystal frequency? What DAC or part are you using? What sample frequency (44.1K, 48K, etc)?
merlin el mago
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Join Date: Sep 2009
Location: Catalonia - Europe
Quote:
 Originally Posted by TheGimp What is your crystal frequency? What DAC or part are you using? What sample frequency (44.1K, 48K, etc)?
Transport CEC TL1 crystal frequency 16.9344 MHz

DAC TP Buffalo III

Transport CEC TL1 uses CD red book 44.1KHz

Last edited by merlin el mago; 27th April 2012 at 05:16 PM.

 27th April 2012, 05:16 PM #9 kevinkr   diyAudio Moderator     Join Date: Sep 2004 Location: Boston, Massachusetts How are you connecting the dac to the transport I2S (presumably) or spdif? I think you need to provide some information on the transport chip set as well. __________________ "To argue with a person who has renounced the use of reason is like administering medicine to the dead." - Thomas Paine
 27th April 2012, 05:20 PM #10 glt   diyAudio Member   Join Date: Oct 2004 It is implementation dependent. You could guess that it is 256fs 44.1x256=11.2896MHz 11.2896*3=33.8688MHz 33.8688MHz/2=16.9344MHz In this case the clock goes through some logic to be multiplied by 2 and then divided by 3 to arrive at 256fs. So it depends what kind of multiplication and division the clock goes through __________________ www.hifiduino.wordpress.com

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