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lm49350 audio codec

Other Parts Discussed in Thread: LM49350

Hello everyone :

I've been working with the audio codec LM49350 and now my partners and I have been checking  the freq response of the codec, and there are many  harmonics being generated, is that normal ? is there a way to reduced them ?

this image is input (on top) vs output (below) @1Khz

this is FFT of the output signal @1khz

this image is input (on top) vs output (below) @1K0hz

this is FFT of the output signal @10khz

hope you can help me! thanks in advance