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ADMP441, SSM2529 Speech transmission

I am constructing a hearing aid for my bachelor degree project. This hearing aid will consist of a microphone with a Nordic Semiconductor nRF2460 2.4 GHz transmitter, and a receiver of samë model with a speaker. This device should filter out any unwanted frequencies outside of speech, that is anything outside of 1-5 kHz. We want to sample at 12 kHz. I and my group are designing the PCB's and power supply ourselves. For simplicity we want mostly digital signals on our PCB's. Therefore we want to use the ADMP441 which has an ADC included with an I2S interface. Our transmitter and receiver (which are the same IC), support 16 bit I2S. The SSM2529 will be our DAC and amplifier stage, and also the filter stage.

The question is, can I use the ADMP441, which supports 24 bit, to send a 16 bit signal to my 16 bit compatible transmitter?

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  • Have you confirmed with Nordic what is the ratio of the CLK frequency to the frame rate? I just want to be clear that if it's 64x, then your design should work fine with the ADMP441.

    I don't think that there's any preferred microcontroller. I'd say that, if you're comfortable using an AVR, and it has the capability to set up the amplifier (the ADMP441 doesn't need any microcontroller setup) as you need it, then go with that.

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  • Have you confirmed with Nordic what is the ratio of the CLK frequency to the frame rate? I just want to be clear that if it's 64x, then your design should work fine with the ADMP441.

    I don't think that there's any preferred microcontroller. I'd say that, if you're comfortable using an AVR, and it has the capability to set up the amplifier (the ADMP441 doesn't need any microcontroller setup) as you need it, then go with that.

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