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PCM1753 SNR Iissue

Mickey Zhang
Genius 12080 points
Other Parts Discussed in Thread: PCM1753

Hi Team,

The customer is using PCM1753. In his design, he tests the SNR value and it is only 72dB. He does a test. He removes the LEFT_LPF and RIGHT_LPF circuit ,and connects two 10uF capacitance to 7 pin and 8 pin. That is  the output for 7 pin and 8 pin is directly to the headphone.  Finally, he can hear music from the headphone , but there is a lot of noise. Look the  attachment. 

What is the reason? Is the schematic correct?  How to solve the issue?

Thanks,

Best Regards,