I2S Clock Source

g-sixty · 13th September 2007, 04:12 AM

Hello,

I am trying to find a good clock source for I2S. This includes master, bit, and LR clock. I would like to have:

LRCK: 48kHz
Bit Clock: 3.072MHz
Master Clock:12.288 or 24.5760MHz

I was going to use a texas instruments DIR9001 and use external mode but the clock only offers:
LRCK: 96kHz
Bit Clock: 6.144Mhz
Master Clock: 24.5760Mhz

I was thinking of using some flip flops to make a divide by 2 frequency divider but I do not have enough board reality in order to get my student discount. Anyone have any ideas for a novice? Thanks!

gmarsh · 13th September 2007, 01:55 PM

My usual "recipe" is two cascaded 74xx163 synchronous counters. This will give you low delay /2 to /256 outputs.

/256 is your frame sync and /8 or /4 is your bit clock for respective 16 and 32 bit frame sizes.

Clock the counter with a 12.288MHz clock source.

g-sixty · 14th September 2007, 09:39 PM

Thank you very much! I totally forgot about using a simple counter! This will be super easy than.

13th September 2007, 04:12 AM	#1
g-sixty diyAudio Member Join Date: Apr 2007	I2S Clock Source Hello, I am trying to find a good clock source for I2S. This includes master, bit, and LR clock. I would like to have: LRCK: 48kHz Bit Clock: 3.072MHz Master Clock:12.288 or 24.5760MHz I was going to use a texas instruments DIR9001 and use external mode but the clock only offers: LRCK: 96kHz Bit Clock: 6.144Mhz Master Clock: 24.5760Mhz I was thinking of using some flip flops to make a divide by 2 frequency divider but I do not have enough board reality in order to get my student discount. Anyone have any ideas for a novice? Thanks!

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13th September 2007, 01:55 PM	#2
gmarsh diyAudio Member Join Date: Apr 2004 Location: Halifax, NS, Canada	My usual "recipe" is two cascaded 74xx163 synchronous counters. This will give you low delay /2 to /256 outputs. /256 is your frame sync and /8 or /4 is your bit clock for respective 16 and 32 bit frame sizes. Clock the counter with a 12.288MHz clock source.

14th September 2007, 09:39 PM	#3
g-sixty diyAudio Member Join Date: Apr 2007	Thank you very much! I totally forgot about using a simple counter! This will be super easy than.

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