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Sigma-Delta ADC linearity

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Hello:

I have a audio sigma-delta ADC,
when input =1Vpp, dynamic range > 80dB,
when input < 1mV, noise floor < -80dBV

Bt wen input~10mVpp,
we have 2nd, 3rd, 4ht ...harmonics about -60dBV

Does anyone meet similar situation before?

Thanks in advance
 

Dear Sunking

please give more information of reference about
"TONE COMING"?

thanks in advance,
 

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