ICE40-ADC with Arduino/Pi Pico

[tomh381]

Hi guys. I'm trying to use an ICE40-ADC with a Pi Pico (programming with Arduino IDE) to make a high-frequency oscilloscope. I cannot find anywhere an explanation of how to wire the ICE40-ADC up. I found the schematic but it makes no sense to me at all. Any advice/knowledge about this would be much appreciated.
TIA