Hello again. I am currently trying to build my first shield for the stm32f103c8t6.
I am planning on implementing an external ADC to allow improved data acquisition (MCP3903).
However, I have a few questions that I need some help with and would appreciate some input.
I am trying to reduce the noise picked up by the external ADC. Are there specific things that
I need to look out for? For example:
a)The ADC MCP3903 has 6 differential signal inputs which I would like to pair with 1x3.3V ,1x5V and
GND each via a micro usb interface. Would the power lines influence the signal lines?
b)To my understanding Analogue and Digital ground should be separated. However, I am unsure
how to do this correctly. From what I have read on forums, many only use a Capacitor connecting
the two. Is that sufficient or is there a better method. It would be nice to maybe get a solution via
an example

c)The power supply usually carries noise which will be used as external reference used by the ADC.
what would be the best & simplest solution to suppress the noise?
Thank you for your time.