Neurotechnology Research Systems
Optogenetic Controller
- 28 -
10
Optogenetic Controller Limitations
10.1
Latency between digital input and voltage output
The timing dynamics in voltage mode of starting the first channel with a digital input are shown
below. All digital outputs change to reflect that a digital input trigger has been detected within
200ns, though not exactly at the same time. The voltage output begins to change 9.5us after the
digital input trigger, and the rise time of the voltage output is less than 4us.
Because all channels operate on the same 10kHz clock, there is 100µs of variation in start latency
when starting a second channel while the first is running. This is because the second channel
cannot start until a rising edge of the 10kHz clock is seen, and this clock is asynchronous to the
digital input.
Digital stop timing in voltage mode is shown below. All digital outputs change to reflect that a
digital input stop trigger has been detected within 200ns, though not exactly at the same time. The
voltage output begins to fall within 110us (just over one sampling period) after the digital input
trigger, and the fall time of the voltage output is less than 9us.