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ADMP441 not working.

I have followed the data sheet of the ADMP441 to the dot and i am using STM32f373cc for get data from it using I2S but all i get is a constant noise on the data line. I already have a 100k pull down resistor on it. Anyone has a solution to this problem?

Attached it the noise signal on a oscilloscope. It only appears if both WS and SCK are connected to the microphone. and this is all that appears.

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