Multi-DM™ User Manual Section 10 - Reference Information
BMC Document Number: DOC-0009 Rev. 5.2 Page 60
10.9 System Performance
System performance, also referred to as system latency, is a measure of the time:
• Starting when the host PC first starts sending DM data to the Driver
• Ending when the DM mirror reaches its desired shape.
The total system latency is comprised of the time it takes to complete
three sequential stages of the DM control process.
Stage Performance Factor
Data is sent from the host PC
to the Driver and processed
Data Latency Time
Determined by the data transmission speed
and the driver processor and DAC speed.
Amplifiers are changed
to their desired value
Amplifier Slew Time
Determined by the amplifier slew rate and the
magnitude of the change in voltage level.
DM actuators change
to their desired value
Mechanical Response Time
Determined by the physical characteristics,
primarily the mirror architecture, of the DM.
These stages, along with some necessary terms and concepts, are now described
in greater detail.
Frame Size
The amount of data required to define all actuators on a DM is known as the DM Frame
Size. The Frame Size scales with actuator count. For example:
• Multi-DMs have Frames comprised of 160 16-bit (2 bytes) output levels,
which translates into 320 bytes of data.
• A Kilo DM, with just over a thousand actuators, each defined by
16-bit (2 bytes) output levels, has a Frame sizes of 2kB of data.
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