What is Crosstalk and how is it measured?
Crosstalk is defined as the measure of any feedthrough coupling on to the quiet channel of a multichannel ADC. It is expressed in decibels as a ratio of the energy of the aggressor (active channel) on that of the victim (quiet channel).
Crosstalk can be measured in many different ways. The most rudimentary method is to drive one channel with a full scale signal and observe the fundamental frequency level on any open (quiet) channel. There are other techniques that will reveal the level of crosstalk on an ADC. They are all described in detail on page 17 of the application note AN-835 (see attached).
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