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How to remove noise in AD1937

Question asked by song on Jan 25, 2012
Latest reply on Mar 13, 2012 by ColemanR

Hello, AD.

 

My team designed evaluation board with AD1937 and several board are having some noise when we play sone at 48kHz 256fs TDM format and AD1937 is master mode (LRCLK and BCLK is coming from AD1937 and DATA is from DSP side).

 

One strange thing is that the noise is gone when I touch just LRCLK pin not other pins with pinger or oscilloscope probe.

And also when ADC is off, the noise also is gone.

 

I just observed this noise, and tried several thing but I don't know why noise is gone with turing off ADC and probing LRCLK signal.

 

Can you give me some check point related h/w design?

Have you seen this kind issue?

 

Thanks.

Songhee.

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