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DS92LV18 vs DS92LV16

Tom Saluzzo
Expert 1280 points
Other Parts Discussed in Thread: DS92LV18, DS92LV16

When looking at the TI website for the DS92LV16, TI recommends an alternative part - DS92LV18. Is there any errata, issues, or limitations which explain why TI recommends this alternative part?

The reason I am asking is:

Customer uses the DS92LV16TVHG in a product that has been in production for a couple years and recently has been having somewhat random failures (seeing noise that corrupts the video). They run the part at 80mhz at room temp and the chip does not appear to get noticeably hot but when they cool it down with a fan the noise goes away (the transition seems to occur at around 20C). When they reduce the frequency (to 60mhz) the noise goes away as well.  They have done a lot of testing of boards out of the same lot and some have no problem, some they see a little noise, and some a lot of noise.  They are stumped and wondering if there is any errata available that isn’t obvious or if there has been other reports of similar failures or design guides/suggestions/ advise….miracle fixes.

  • 0
    TI__Guru* 93670 points
    Hi Tom,

    I checked on this to see if there is any other customer who has reported a similar problem related to DS92LV16 and there is none.

    There could several potential causes for bit error or video noise:
    1). Could the customer try to isolate the issue to see if this is occuring on the Tx or Rx side first? Once this is done, then we can further isolate the issue(note #2 below).
    2). When they raise or reduce clock frequency or change temperature, they are changing AC timing parameters. Could the customer check Tx and Rx timing parameters to make sure there is margin and meets device requirements?
    3). Please check TCLK jitter and de-serializer noise margin as noted in the data she
    4). Dou+/Dout: To make sure there is enough eye opening.

    Regards,,nasser