Other Parts Discussed in Thread: DLPC910, DLPC410
Hi all,
In principle I am worried about the same issue like "Peter" here: e2e.ti.com/.../620500 To me it seems that there was a misunderstanding. On the one hand there is the IDLE mode of the DMD (DMD Lightcrafter 9000 from Texas Instruments) which turns on/off a 50/50 duty cycle of the mirrors (so switching between state -12deg and 12deg) but I think Peter is worried about something else.
I use the pattern on the fly mode and 1 bit patterns. By uploading one image and defining infinite repeat of the sequence, the DMD displays a static image (100/0 duty cycle). I used a photodiode to observe the intensity of the beam leaving the DMD and I find that there are intensity variations each 105 microseconds (basically the same thing that Peter mentioned). I think that the mirrors are released each 105 microseconds such that they are in an undefinded state (oscillating so they are neither at +12deg nor at -12deg). One can observe the same behaviour when the DMD switches between a black and a white image (mirrors are in -1, than they are released and oscillate, after that they are in +1).
Is it possible to turn off this 105 microecond clock pulse?
Best Carl