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Old 13th September 2007, 04:12 AM   #1
g-sixty is offline g-sixty  United States
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Default I2S Clock Source


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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Old 13th September 2007, 01:55 PM   #2
gmarsh is offline gmarsh  Canada
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Location: Halifax, NS
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.
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Old 14th September 2007, 09:39 PM   #3
g-sixty is offline g-sixty  United States
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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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