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PCM1804: ADC produces large 3rd harmonic in the conversion process

Amy Luo
Expert 6895 points
Part Number: PCM1804

Hi team,

When using PCM1804, one of our customers found that the third harmonic generated by ADC in the conversion process is large, which affects the distortion. See the figure for details. The input signal is a single frequency 1kHz signal without interference, and the amplitude is 0dBu. The stronger the input signal, the stronger the harmonic of the third harmonic.

Do you have any good suggestions and any special matters needing attention in the design?

Best Regards,

Amy Luo