I have a ADXRS646 gyroscope and just wondering how to I compute the RMS of noise, i.e. is there any equivalent formula as mentioned for ADXL203 accelerometer data sheet (page 12) .
You can use the same formula for the ADXRS646 gyro as well. You can find the noise density spec for the gyro in Table 1 of the datasheet. Also, the factor "1.6" in the equation is for a single pole filter. If you use higher order filters you have to change the factor. For a 2-pole filter the factor is 1.22 and 3-pole is 1.15.
For additional information on this topic, this reference has been very useful for me.
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