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DLPC910: DLPC910

Part Number: DLPC910
Other Parts Discussed in Thread: DLPA200, DLP9500, DLPC410

  • Hello.

    In the DLPC910 sample design. the RESET_ADDRx, RESET_MODEx, RESET_SELx pins which are output have a "RC filtering only needed due to impedance mismatch by TI flex cable".

    can someone explain why the R-C is actually a C-R filter? i mean, those are output ports. 

  • Hi Moshe,

    We are also in the process of reviewing this reference design and making updates as needed. Fizix will be able to help with the RC/CR question to make sure you are getting the most up to date info and response.

    Thanks,

    Matt

  • Moshe,

    We are looking at this and it may take a couple of days to answer. 

    Fizix

  • Moshe,

    This appears to be a high pass filter.  It is still considered a type of RC filter on these lines and acts similarly to a RL filter.  

    Originally the flex cable system was designed for an external analog reset driver which send the ADDR signals to the DLPA200(s).  For this circuit the lines used on the TI flex cable were not designed with the proper impedance to carry these signals to the DMD board.  This circuit was chosen the better match the cable impedance to get the signals to the DMD with better signal characteristics.

    Fizix

  • Hi Fizix.

    thank you for the reply.
    so, in that case, please allow me to ask this:

    we have similar design of the DLPC410 and the DLP9500. in the DLPC410 datasheet those lines have remarks to place 36.5 ohm and then 27pF.....that said, would it be fair to say that good practice would be tp follow same methodology here also? or follow the DLPC910 sample design of 30pF to GND and then 24.9ohm? i mean. what values and topology (R-C or C-R) should be best practice for our flex cable which we tend to use (same flex we use for the DLPC410-DLP9500).

  • Hi Moshe.

    I will get with Fizix on this DLPC410 questtion and respond this week.

    For this DLPC910 thread though, I would like to close it. Is that ok?

    Thank you,

    Matt