I have read the datasheet of the ADS1282. In figure 37 one fins a fft-spectrum with some strong signal components from DC t around 10Hz. I'm wondering if this is just some kind of DC-offset that has some kond of side slobes in the fft spetrum or if it is prohibitive to use the ADS1282 with relevant signal spectra - as it is relevant in my application - in the range of 2 to 4Hz.
I undestand that it is useful - because of 1/f-noise components from the analog frontend to use a HP-filter. But as my sensors have their best sensitivity with an excitation in the range of 2-4Hz I would like to use a custom HP-filter and not the internal IIR-filter in the ADS1282 - so that I can implement a sharper filter edge between 1 and 2Hz with enough attenuation above 2Hz. Anyway I need to know if this is at all feasible with the ADS1282 or if there is some reason why the SNR of the ADS1282 detoriates in the frequency range up to 10Hz (for example because of some reason in conncetion with the way the sigma-delta-moulator is implemented).
I would apprecaite it if someone could give me an adequate answer or could elaborate on this issue a little bit further ...
