ASRC - I'm confused on clock choice and word length - diyAudio
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Old 30th January 2006, 01:51 AM   #1
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Default ASRC - I'm confused on clock choice and word length

I would like to connect a PCM2706 to an AD1895 sample rate converter, configured for 96kHz output data.

I assume the input is run in slave mode, and the output in master. Would I therefore use a 96kHz * 256 =24.675MHz crystal?

Also, the PCM2706 is specified as 16bit I2S output. The AD1895 indicates I2S compatible on the input, but does not list a specific word length. Will this work without glue logic?

Thanks for your help.
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Old 30th January 2006, 02:44 AM   #2
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That is why you want to use I2S, instead of the J. A. Pan, Inc. format.

Jocko
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Old 30th January 2006, 01:05 PM   #3
gmarsh is offline gmarsh  Canada
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An AD1895/1896 will happily accept 16 bit framed I2S. I've fed them 16 bit, 24 bit and 32 bit audio and they don't care.

And a 24.576MHz MCLK in 256Fs otuput master mode will produce your desired 96KHz output sample rate.
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Old 31st January 2006, 01:55 AM   #4
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I get frustrated when there are no hand holding examples on datasheets.

Ordering parts today
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Old 31st January 2006, 03:33 AM   #5
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Usefulness of data sheet varies greatly from one vendor to another.

Then there are H-P operator's manuals. They are written in such a manner as to assume that you really don't need to read them. If you do, then they deem you unworthy to operate the unit.

Jocko
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