Voltage output DACs are usually specified by a settling time. If a DAC converter has a settling time of T, can it be used to faithfully reproduce a signal which has been sampled at a frequency of 1/T? Or does this frequency has to be lower since there may be substantial ringing in the output signal if one changes the signal before the output has fully settled?
Electronic – DAC settling time and output signal bandwidth
dac
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Best Answer
From what I've seen in datasheets, it looks like the ringing will usually be a few octaves above the bandwidth implied by the settling time (1/T). If that's what's really going on, a low-pass filter should help to dampen that ringing out. On the other hand, I rather suspect that the actual bandwidth and ringing are influenced more by the impedance of the load the DAC is connected to, and the settling time listed on the datasheet is going to be the optimal case caused only by the parasitic capacitance of the DAC itself.