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PCM1808: PCM1808 Sound distortion

Part Number: PCM1808

Dear :

      Now our customer use PCM1808 to convert analog signals to I2S signals, the hardware as below picture. The problem is that the sound is intermittent and severely distorted after DSP is connected, looking at the DOUT pin with a logic annalyzer, 0 data will often appear,  customer analysis wether is because DSP and PCM1808 do not share MCK , plese help to confirm. DSP can't provide MCK in customer application, could you help if have solution, Thanks