The AD7793 is a 24 bit precision Sigma-Delta ADC with on-chip programmable instrumentation amplifier, voltage reference and excitation current source.
Here is the library provided by Analog Devices (AD7793 - Microcontroller No-OS Driver [Analog Devices Wiki]) which I have modified for using on Arduino along with the SPI library.
I hope this can be useful to someone.
AD7793.cpp (24.7 KB)
AD7793.h (12.2 KB)
AD7793_example.ino (2.25 KB)
Communication.cpp (5.86 KB)
Communication.h (3.93 KB)
Readme.txt (9.95 KB)