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ADC Sampling Rate Issue

Amy Luo
Expert 6895 points

When using analog switch + single channel ADC structure to sample multi-channel signals, how to choose the sampling rate of ADC?

My customer question is: There are 10 channels of signals to be sampled. The signal bandwidth of each channel is 10KHZ. The acquisition circuit is prepared to use analog switch + single channel ADC structure. Considering channel switching time, delay sampling and Nyquist, how much sampling rate should ADC choose to accurately collect input signals?

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    TI__Guru**** 182721 points
    Hi Amy,

    This is not as simple a question to answer as you may think. It really depends on the type of ADC you are looking at here, do you have any specific part numbers in mind? You need to consider the switching characteristics of your analog switch (MUX) and how long it takes for your input signal to settle after the channel change. From there you need to consider the acquisition time of the ADC and if you need to include an input driver ahead of the ADC. Depending on the nature of the 10 input signals, you may need a driver for each channel or you may be able to get away with a single driver between the MUX and the ADC input. One place you can start is with our TI Precision Lab series of videos on ADC's - you can find those videos here:

    training.ti.com/ti-precision-labs-adcs

    If you can provide a little more detail on your input signals, we may be able to point you to an ADC that suits your needs.