Elevated Temp. effect on ADIS16255.

Question

Hello, 
 I used ADIS16255 single axis gyro in the application where temp. reached to 125 deg C and 150 Deg C. Since ADIS16255 is recommended to operate up to 85 Deg C, I saw significant increase in temperature dependent bias (around 3.2 deg/s) at 125 deg C and (around 5.2 deg/s) at 150 Deg C. This temperature dependent bias at 125 and 150 C calculated after noise filtering. Does anyone know the reason for increase in bias at such elevated temperature? 
 Does this gyro has any stopped functioning mechanism at elevated temperature? If so, at what specific temperature this gyro stopped or creased to function? 
 ~Chandra

NevadaMark · Accepted Answer

Hello Chandra, 
 It is great to see you posting on the Engineer Zone! I hope that you are doing well! There are a couple of reasons for the change in bias. First, the gyroscope core structure and supporting electronics will begin to experience non-linear behaviors in the bias/temperature relationship, once the temperature exceeds +85C. Second, the calibration only extends to +85C, so the non-linear bias changes will not be corrected. The ADIS16265 provides service to +105C and may provide incremental improvements in these behaviors. We really don't have a go/no-go temperture that we can offer, outside of the operating temperature in the datasheet. Operating at +150C/175C is not surprising, but we cannot assure that across a population of parts. I hope that helps! 
 Best regards, NevadaMark)

Electronic Design Services - PartnerZone

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Elevated Temp. effect on ADIS16255.