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If the motor is running under a slow speed for example 0.5 rps, is the 0.488rps LSB a little bit small? Is there any way to improve it?
If the customer is using the velocity output as feedback to drive them motor and If that motor is always running at a slow speed, e.g. 0.5rps then the AD2S1200 is not the correct part for this application. The LSB size is too big and will cause difficulties. However, most customers actually use the position output to commutate the motor, not the velocity output. The LSB of the position output is 5.3 arc mins i.e.0.09 degrees. If your customer is concerned they should consider the AD2S1210, which offers 16 bit resolution on the velocity output across a full-scale range of +/-125rps i.e. LSB size of 0.004rps.