 6Dof IMU design, how?
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Mattski
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Registered Member #1792
Joined: Fri Oct 31 2008, 08:12PM
Location: University of California
Posts: 527
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For a sensor with an analog output you need to consider the analogy frequency response of the sensor, which for this one is set by an output capacitor and optionally also a resistor. You need to have the cutoff well below the resonant frequency, and then you want to sample at maximum at your 3dB frequency. And the wider your system bandwidth is, the more noise you have, because you are picking up noise over a wider spectrum.
Just a quick glance at the datasheet I think they suggest 400Hz as the maximum cutoff frequency, so I think that means you want to sample a maximum of 800 times per second. I don't know if there's a problem with sampling faster, but you won't be getting any additional information out of it, because that higher frequency content is being attenuated. So it looks like it should work.
And yes, your sensor needs a bandwidth that covers the whole spectral range of linear and angular accelerations/rates.
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