I want to know about the testing procedure involved for sigma-delta ADC For any ADC, whose output is digital data how can we say that the output exactly represent the given analog input signal. I appreciate any help regarding the testing of any ADC.
If you have a sigma-delta ADC (i.e. Sigma-delta modulator + decimation filter) than for you it works similar to any other ADC (successive approx, pipelined etc).
About ADC performance characteristics and testing - look in the following IEEE standart:
IEEE standard for terminology and test methods for analog-to-digital converters - IEEE Std 1241-2000