What could cause the performance from the ADC evaluation board to be less than the typical data sheet specifications?
Although “typical” performance does not guarantee a minimum performance level, National”s evaluation boards generally perform equal to or better than the typical performance of the data sheet. When this is not the case, there can be a number of reasons for this. The primary cause of lowered ADC evaluation board performance is the failure to use an adequate (bandpass) filter between the analog input signal source and the board. Many people assume that their $10,000+ signal source is a very “clean” one, but this is not usually the case. Another cause would be the use of some active circuitry between the signal source and the ADC input, whether that circuitry is on the board or is a separate module.
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