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Why is the output of this 1761 dsp clipping?

Question asked by ElectronicsEEDC on Aug 22, 2017
Latest reply on Aug 25, 2017 by ElectronicsEEDC

Hello,

I'm trying to find out why the output of my dsp is clipping. I'm using a ADAU1761. I went ahead and tried my setup on an ADAU1X61EBZ eval board and it is clipping there as well.

 

I'm putting a 1.56Vpeak to peak 1kHz sinewave into pin 10 and pin 11(gnd). I've enabled the differential path in Sigma Studio and when I look at the output (I'm probing R13 and R14 on the eval board) I see a clipped signal.

 

It's my understanding that the input can be as high as the 1.56Vpp. Is this correct? I've checked and I'm providing 1.8V to the DSP for power.

 

I am uploading a picture of my input and output taken from an oscilloscope and the sigma studio project file.

Any help would be appreciated!

 

Thanks!

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