ADIS16355 temperature calculation

Hello Fox1,

Yes, your calculations are correct.  There are two factors that account for the difference in these readings, with respect to your ambient temperature readings.

1. The power dissipation inside of the ADIS16335 will cause some temperature rise. The Theta-JA (junction to ambient) is 39.8 degrees C/watt. The power dissipation is close to 300mW, so we would expect the temperature rise to be in the range of 10-12 degrees Celsius.
   • Delta-T = 0.057ma x 5V x 39.8 C/W = 11.3 degrees Celsius
2. The xTEMP_OUT temperature sensors are not calibrated, with respect to ambient conditions. For the most part, we expect the accuracy to be on the order of +/-5C, but there are a number of mechanical factors that can influence this (mounting surface/interface, airflow, etc).

I hope that helps.  For future reference, the ADIS16365 is the suggested replacement for the ADIS16355, which is no longer in production.

Best,

NevadaMark

Thank you very much for the detailed answer!