Quantum Composers AF910 - Manual (Page 19)

AF910 Manual Version 1.4 Page 19
- Acceleration function.
- Adjustable step rates up to 80KHz.
- Two speeds for inside and outside of docking range.
- Algorithms for filtering out features that may cause false focus conditions.
- Focus loop update rate of 1KHz.
- Objective offset feature to allow for varying focal planes when switching
lenses.
Figure 11 below shows the typical connections made when using the AF91x for motor
control. Figure 12 shows the typical connections needed for other autofocus units.
Typically an additional motor controller is needed as well as some kind of analog to
digital converter module. Associated software must also be written to tie everything
together.
Figure 15 (AF91x Motor Control)
Figure 16 (Typical AutoFocus Motor Control)
Motor Controller Connections:
Refer to the electrical connection tables for pin numbering and types of connectors to use.
The step and direction signals should be connected to the inputs of the motor driver being
used. The step and direction outputs are TTL levels that can source up to 50mA. The step
output is a pulsed signal with period that is adjustable and a pulse width that is typically
5us. The two limit switch inputs can be connected to any type of limit switch that