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SN65DPHY440SS: Evaluation of Ti SN65DPHY440SS Mipi (DSI) signal extension

Jimmy Huang
Expert 2915 points
Part Number: SN65DPHY440SS

Hello，our client is using 10.1-inch sub screen (800 * 1280) which has a Mipi (DSI) interface, the distance between the main board and the LCD MIP interface of the sub screen is 350mm-400mm (through twisted pair + PCB wiring + FPC, 100 Ω± 10 impedance);

Now, considering that the Mipi line is too long (standard 150 mm), SN65DPHY440SS is selected for Mipi extension;

Please help evaluate the following questions:

1. How long can SN65DPHY440SS extend the Mipi signal? Is 350mm feasible?

2. Mainboard uses LT9211 (Longxun,used for converting DPI to Mipi). Please evaluate whether LT9211 can be used with sn65dphy440ss?

  • +1
    TI__Guru**** 159071 points

    Hi,

    The DPHY440 supports up to 5dB at 750MHz and 2.5dB DE on its TX. These features were intended to some extent to compensate the ISI loss in the channel. It’s hard to tell a max transmission distance, with different transmission materials may have different results, also the clock rate, source signal swing, DE level of source signal, EQ capability of end point receiver will take an effect.

    How much is the 350mm channel loss? Can they order a DPHY440 EVM for evaluation?

    Thanks

    David