Hello,
I'm using the ADS131A04 to measure voltage readings. Currently, we're generating a fundamental (60 Hz) signal with a couple harmonics with high magnitude to produce a crest factor of 3 in the signal. When we do this, we start to see bad readings, with the fundamental magnitude, as well as the harmonic magnitudes, lower than they should be. Other harmonics that weren't part of the signal are also reported. When the crest factor is under 2, all the values look fine.
I've looked over the datasheet, and I see nothing about crest factor, whether there's a maximum or not. I do know that higher frequencies get attenuated, and I've already accounted for that. And we're nowhere near the upper limit of measuring the signal.
I want to rule out where the problem could be, so I'm looking at the A/D converter right now. Can someone confirm that the ADS131A supports a crest factor of 3?
Thanks for your time.
- Tom