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AD1937 - Can I set ABCLK per frame to over 64cycles in I2S stereo mode?

Question asked by song on Sep 29, 2011
Latest reply on Sep 30, 2011 by song

Hello, AD engineers.

 

I am using AD1937 for recording and I am just checking ad1937 for what kind of BCLK and LRCLK I can use when I record.

I have several questions about BCLK frequency for ADC operation.

 

 

I set..

ADC test format is stereo, ASDATA delay is 1cycles, ABCLKs per frame is from 64 to 256cycles.

When I set ABCLKs per frame to 64cyles, the L/R data is coming out from AD1937 accoring to LRCLK ( L data is on low of LRCLK and R data is on high of LRCLK).

But when I set ABCLKs per fram to 128 or 256, both of L/R data is coming out on low of LRCLK. Should I set something else? or is it right operation?

 

In page 19 of manual, the note says "BCLK FREQUENCY IS NORMALLY 64xLRCLK BUT MAY BE OPERATED IN BURST MODE.".

 

It looks like giving some information about BCLK frequency and if I set BCLK freuqncy to 128 or 256 cycles, is it burst mode?

What is burst mode?

 

Thank you.

Songhee.

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