How linear is the MMDM response?
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FAQs -
MMDMs
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The displacement of the mirror surface is proportional to the SQUARE of the applied voltage. The mirror response can be linearized using the operation of square root. For 8-bit biased digital control the following expression can be used to convert the control signal CS (in the range -1...1) into the control byte CB applied directly to the digital board controlling the mirror actuator: CB=(int)sqrt(0.5*(CS+1))*255.; This formula provides linear correspondence between the control signal CS and the mirror displacement and sets the mirror into theoretical biased position when CS=0.
MMDM features negligible hysteresis.
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