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
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.