ASRC - I'm confused on clock choice and word length

thespeakerguy · 30th January 2006, 12:51 AM

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.

Jocko Homo · 30th January 2006, 01:44 AM

That is why you want to use I2S, instead of the J. A. Pan, Inc. format.

Jocko

gmarsh · 30th January 2006, 12:05 PM

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.

thespeakerguy · 31st January 2006, 12:55 AM

I get frustrated when there are no hand holding examples on datasheets.

Ordering parts today

Jocko Homo · 31st January 2006, 02:33 AM

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

30th January 2006, 12:51 AM	#1
thespeakerguy diyAudio Member Join Date: Feb 2001 Location: Silicon Valley	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.

31st January 2006, 12:55 AM	#4
thespeakerguy diyAudio Member Join Date: Feb 2001 Location: Silicon Valley	Thanks I get frustrated when there are no hand holding examples on datasheets. Ordering parts today

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30th January 2006, 01:44 AM	#2
Jocko Homo Banned Join Date: Feb 2002 Location: As far from the NOSsers as possible	That is why you want to use I2S, instead of the J. A. Pan, Inc. format. Jocko

30th January 2006, 12:05 PM	#3
gmarsh diyAudio Member Join Date: Apr 2004 Location: Halifax, NS, Canada	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.

31st January 2006, 02:33 AM	#5
Jocko Homo Banned Join Date: Feb 2002 Location: As far from the NOSsers as possible	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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