PDM Microphone Background Static Troubleshooting

I'm experiencing background noise from my PDM microphone, which is connected to a codec ADC6140 during recording. I've already attempted to troubleshoot the issue by adjusting the microphone settings, but the problem persists. I need review of the PCB layout to identify the problem Key requirements: - Proficient in audio electronics troubleshooting - Experience with PDM microphones and codecs - Able to diagnose and resolve analog circuit design Please provide your approach to diagnosing and fixing this issue in your bid.