what is the resolution of the ADC in Alchitry Cu ?

how many bits are used to represent an analog value ?

The XADC is a 12-bit ADC, but it’s loaded into an 16-bit data register. The lowest 4 bits are used to add precision if you enable averaging. The XADC is documented in exhaustive detail at https://www.xilinx.com/support/documentation/user_guides/ug480_7Series_XADC.pdf

is this on alchitry Cu ? oops Cu doesn’t have one?

Sorry, my mistake.