Raspberry Pi is a small ARM based single board computer running Linux.
This reference design demonstrates how the Rapsberry Pi can be integrated with the RPi_HUB Module and an external analog to digital converter (ADC).
The RPi_HUB module utilises the FT2232H device which will be used in MPSSE mode to create an SPI master interface to read the external ADC.
Application note AN_221_Adding_An_ADC_to_a_Raspberry_Pi explains how to install FTDI D2xx drivers on the Rapsberry Pi platform and then wire up an ADC to the RPi_HUB module.
The schematic may be downloaded here RPI_ADC_schematic.zip
Full application source code to read and display the data from the ADC is available here ADC_source.zip