Uneven Noise Characteristics - LSM6DSV80X Gyroscope

[SamuelRokoko]

When testing the gyroscope of this product (LSM6DSV80X) we noticed that the noise density on each gyro axis is different with z being the lowest. This was observed on the dev-board (STEVALSMKI109DA) both in high performance and HAODR modes. The ratio between x and z is particularly noteworthy. 
Is there an explanation for this? The datasheet only reports one noise density so I am assuming that all axis should be the same. The same characteristics has been found on two different units. 

N.B.: Plain implies high performance. Rn is the noise density 

[Federica Bossi]

Hi ​@SamuelRokoko ,

The noise density value reported in the datasheet is a typical characterization value, generally representative of the device performance and not necessarily identical on each individual axis. 

So, if one gyro axis shows a lower noise density than the others, it is expected. The datasheet value should be interpreted as a nominal / typical reference, rather than a guarantee that all three axes will match exactly.

If the average of the three axes matches the datasheet value, then the result can generally be considered consistent with the specification.