Dear Sir or Madam,

I was wondering if there is a spec for the In-run Bias stability of the ADXRS290.

Many thanks.

M Atwya

Dear Sir or Madam,

I was wondering if there is a spec for the In-run Bias stability of the ADXRS290.

Many thanks.

M Atwya

- 1 person found this helpful
The ADXRS290 was designed and documented for a particular application space, which didn't need to understand this behavior. That is why this specification was not placed in the ADXRS290 datasheet. We are giving consideration to adding this into the datasheet, but that is still under consideration. Do you have a specific requirement that you are trying to hit for this behavior?

Dear Mark,

I have already asked about recommendations for my intended application in another question and have recieved your recommendations (ADIS16485, ADXRS290). I am currently in the process of understanding and calculating all the behaviors that can be quantified to conclusively put together a mathematical proof of concept. Hence, why I asked about the In-run Bias stability specification.

I would appreciate any tips on converting a pitch measurement accuracy into gyroscope specifications.

Many thanks.

The following is a scenario of the intended application:

1. Assume you have the vehicle's "exact" pitch at the start.

2. Switch on gyroscope, (now the vehicle's exact pitch is unknown).

3. Use gyroscope pitch angular rate to update (<0.2 Hz) vehicle's pitch.

Assuming the vehicle's pitch is limited to +/- 6 degrees, can any of the avialable gyroscopes be used to maintain an accuracy smaller than or equal to +/- 0.5 degree on the Vehicel's pitch?

M Atwya

Thanks for your reply.

Regarding the update rates, the intended application only needs to update the pitch measurement every so often. This does not mean that the gyroscope would be limited to this update rate though.

The ADIS16480 is out of budget for this project, otherwise it would have satisfied the requirments.

I was wondering if the ADXRS453 would meet the aforementioned requirments. Any inputs on this?

Best regards,

M Atwya

- 1 person found this helpful
With respect to the ADXRS453, we suspect that this is possible, but we have not done this ourselves. The ADXRS290 actually has much better noise/stability than the ADXRS453. The research I have done suggests that the in-run bias stability of the ADXRS290 is approximately ~8-10 deg/hour, which is roughly 2 times better than the ADXRS453. Hope that helps.

With respect to the ADXRS453, we suspect that this is possible, but we have not done this ourselves. The ADXRS290 actually has much better noise/stability than the ADXRS453. The research I have done suggests that the in-run bias stability of the ADXRS290 is approximately ~8-10 deg/hour, which is roughly 2 times better than the ADXRS453. Hope that helps.