Deriving WS from a 24.576MHz clock?

Lovan · 15th November 2006, 12:31 AM

How would I go about to get a WS(192kHz) when I have a referenceclock of 24.576MHz?

/Lovan

gmarsh · 15th November 2006, 12:48 AM

Divide by 128.

A 74HC393 should do just fine.

Lovan · 15th November 2006, 12:53 AM

Hello again gmarsh!

I might be tired right now but if I divide by 128 I get Fs(192KHz) in other words, bck right?
But how do I get WS(LRCLk,whatever)?

/Lovan

Lovan · 15th November 2006, 01:48 AM

Ignore my last post.

Ofcourse, I meant BCK, not WS.
BCK should be Fs*2*24=9.216MHz right?
that is 24.576*(3/8)?

Wes Marquenie · 15th November 2006, 09:34 AM

Why to multiply by 24? I2S only supports 16 or 32 bit data frames

gmarsh · 15th November 2006, 03:23 PM

BCK will be 24.576 / 2.

The same HC393 chip used for LRCLK will generate BCK for you.

Lovan · 15th November 2006, 03:44 PM

Thank you Gmarsh.
I figured it out after I had posted the last reply. Thanks for the reassurance that I have gotten my head screwed on again

15th November 2006, 12:31 AM	#1
Lovan diyAudio Member Join Date: Oct 2003 Location: Sweden	Deriving WS from a 24.576MHz clock? How would I go about to get a WS(192kHz) when I have a referenceclock of 24.576MHz? /Lovan

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15th November 2006, 12:48 AM	#2
gmarsh diyAudio Member Join Date: Apr 2004 Location: Halifax, NS, Canada	Divide by 128. A 74HC393 should do just fine.

15th November 2006, 12:53 AM	#3
Lovan diyAudio Member Join Date: Oct 2003 Location: Sweden	Hello again gmarsh! I might be tired right now but if I divide by 128 I get Fs(192KHz) in other words, bck right? But how do I get WS(LRCLk,whatever)? /Lovan

15th November 2006, 01:48 AM	#4
Lovan diyAudio Member Join Date: Oct 2003 Location: Sweden	Ignore my last post. Ofcourse, I meant BCK, not WS. BCK should be Fs224=9.216MHz right? that is 24.576*(3/8)?

15th November 2006, 09:34 AM	#5
Wes Marquenie diyAudio Member Join Date: Jan 2003 Location: Enschede	Why to multiply by 24? I2S only supports 16 or 32 bit data frames

15th November 2006, 03:23 PM	#6
gmarsh diyAudio Member Join Date: Apr 2004 Location: Halifax, NS, Canada	BCK will be 24.576 / 2. The same HC393 chip used for LRCLK will generate BCK for you.

15th November 2006, 03:44 PM	#7
Lovan diyAudio Member Join Date: Oct 2003 Location: Sweden	Thank you Gmarsh. I figured it out after I had posted the last reply. Thanks for the reassurance that I have gotten my head screwed on again