ADXRS150EB questions

[velocipenguin]

We are using an Analog Devices ADXRS150EB angular rate sensor as a component of our inertial navigation system. While testing it with an oscilloscope, I've noticed that its behavior differs from what I expected. It is being powered from a very well-regulated and filtered power supply that is supplying 5 V DC at up to 1 ampere. The 2.5V reference output on the rate sensor board measures 2.5 V, and the rate out pin hovers close to that when the device is not being moved. When moving the device, I've noticed that the output waveform is not steady; rather, it looks very much like a high-frequency triangle wave whose amplitude corresponds to the voltage representative of the device's rate of rotation. Is this behavior normal for the ADXRS150? Should I add additional filtering on the output? I don't want to get weird aliasing errors when sampling this data, and I'd love to know if anyone knows anything about whether this sort of output waveform should be expected with this part. Thanks in advance.