1. ADIS16209 uses gravity as its stimulus and use arc triangular function to calcuate the tilt angle. Any other acceleration more than gravity will influce the test result of ADIS16209.
2. If you test the tilt angle in stable condtion and in pitch and roll, the gyro is not necessary. If you want to the angle in yaw and/or in motion status, gyro is recommended.
Thank you very much for posting on the Engineer Zone! If you are able to translate this into English, it might help us answer your question faster. If not, I can ask one of my colleagues to help.
I just wanted to check back in on this. Look forward to helping when translation is available. Very sorry that I don't have the capability to do this translation myself.
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