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Appendix A
Input Signal Bandwidth
The input signal bandwidth is determined by the Sigma-Delta ADC sample rate. In a
multiplexed system, the input signal bandwidth is greater than the per channel sampling
frequency. For the DT9828, you can derive the input signal bandwidth from the following
equation:
–3 dB bandwidth (Hz) = total throughput x 2
As an example, if four channels are enabled at a per channel sampling frequency of 10 Hz, the
input signal bandwidth is 80 Hz (40 Hz x 2).
For proper reconstruction of acquired signals, ensure that the per channel sampling frequency
is set in accordance with the Nyquist criteria. That is, set the per channel sampling frequency
to a minimum of twice the frequency of the signal to be acquired. As an example, if you wish
to acquire a 5 Hz signal, set the per channel sampling frequency to a minimum of 10 Hz.
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