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ADAU1446 clipping algorythms

Question asked by Gordon on Mar 24, 2010
Latest reply on Mar 30, 2010 by BrettG

Hi. I'm experiencing some odd results using the clipping tools. The clipping behaves as expected at low frequencies but modulates rather than clips at higher frequencies. The problem becomes perceptible at about 5/6k and is really noticeable at 8/9k as the attached scope shots show. They're both at the same settings. The top one is a stored shot with soft clipping. The bottom without the soft clipping. SigmaStudio schematic attached. This is NOT the same board I was having the CLKOUT modulation problems with. The clock on this board is stable.

 

Hope someone can shed some light on this.

 

TIA

 

Gordon

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