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I am using my Raspberry pi 3 and I am wondering if there is actually a 24 bit ADC chip compatible with the pi? I am going to use that ADC with LVDT sensor to measure a distance of 10mm in good precision. I understand that noise will kick in and I can only achieve 18 bit accuracy from the link below. https://www.raspberrypi.org/forums/viewtopic.php?f=37&t=64503

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There's support for the ADAU1977 (Quad 24 bit ADC) in the 4.9 kernel. To use it get the pi kernel sources (https://github.com/raspberrypi/linux.git) check out the rpi-4.9.y branch and follow the build/install instructions (https://www.raspberrypi.org/documentation/linux/kernel/building.md) then edit the /boot/config.txt file, removing dtparam=audio=on and adding dtoverlay=adau1977-adc then use arecord (or another audio app) to capture the samples.

  • Thank you for answering :) Hmmm once I am done with the installation of the kernel, which package should I use? Or I can just obtain the drivers of this ADC from the supplier ? – HamHam Jan 24 '17 at 6:58
  • If you follow the instruction then arecord -l will show the ADC. It looks like support was added in kernel 4.4 (github.com/raspberrypi/linux/pull/1454) – plastic chris Mar 2 '17 at 8:38

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