Multi-DM™ User Manual Section 10 - Reference Information
BMC Document Number: DOC-0009 Rev. 5.2 Page 62
Frame Rate
It is often useful to look the Data Latency component of system performance
in terms of a frequency instead of a time period.
When expressed in that manner, the number of Frames of data that can be sent
in a given time interval, in this case one second, is known as the Frame Rate.
The Frame Rate of Boston Micromachines’ DM and Driver combinations
is typically in the kHz range.
The Frame Rate is inversely proportional to the Data Latency time.
Driver Comparison
The Data Latency period \ Frame Rate frequency can be optimized by using
a faster Driver and data connection combination. All Boston Micromachines DM models
have both a standard and high speed driver available.
Amplifier Slew Rate
Another necessary term is Amplifier Slew Rate.
The high voltage amplifiers in the Driver must change their output voltages
to move the mirror from one shape to another. The rate of change (or "slew")
in the output voltage per unit time is known as the Amplifier Slew Rate.
The amplifiers in Multi- and Kilo-class Drivers slew at 2V/μs.
The amplifiers in X-class and S-class Drivers slew at 20V/μs.
Amplifier Slew Time
As soon as the entire Frame of digital data is fully loaded into the DACs,
the analog values for all of the actuators are sent to the high-voltage amplifiers.
Each amplifier then changes (or "slews") its output voltage from its current value
to its new value. The time this takes is known as the Amplifier Slew Time.
The Amplifier Slew Time is determined by two factors:
• The Driver's Amplifier Slew Rate.
The faster the slew rate, the shorter the Amplifier Slew Time.
• The magnitude of the change in the amplifier output voltage.
The greater the difference between the current output state and
the desired output state, the longer the Amplifier Slew Time.
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