PWM (or I2S) input using cDAQ and NI 9402

[Tanis]

Hi folks.

I'm trying to capture digital signals from some mems microphones. This one operates at 2.4 MHz which seems much less than the 18 MHz the NI-9402 can do. 

So my question is, could i capture the PWM output of the microphone using the NI-9402 module. Or should i go with someother solution. 

I'm restricted to using a cDAQ (since thats what i have).

Thanks so much for reading. 

Any feedback is appreciated.

Here is the specsheet of the microphone.

http://www.analog.com/static/imported-files/data_sheets/ADMP421.pdf

[Esteban_B]

Hi Tanis,

If what you are trying to do is to acquire the signal from the microphones, just connect it to the 9402 and create a counter input task for this acquisition. This should work, as this is a Digital IO module.

This is an example code that might work for you.

Give it a try and let us know.

Regards,