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Digital MEMS microphone interface with nRF51822

I'm looking to integrate a digital (PDM/I2S) MEMS microphone into my nRF51822-based design. I'd like some pointers to reference designs or other information -- the ones that seem relevant on the Nordic site (nRF6929) are locked :(

Has anyone had success with interfacing with such microphone?

(I know that the nRF51822 does not have an I2S module.)

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