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TUSB542: Asking for recovering insertion loss of input/output signal

donghun keum
Prodigy 10 points
Part Number: TUSB542


Asking for recovering insertion loss of input/output signal

USB 3.0 Channel loss budgets for superspeend at 2.5 Ghz(5Gbps) like below

[PC CPU] -----(-10dB)------ [USB A] ----USB Cable(-3.5dB)-----[USB C] -----(-6.5dB)------ [AP]

USB 3.0 documenmt says AP can recognize -20dB signal

Question 1) We want to use 2m~2.5m meters long USB cable (-12dB), so total insertion loss  is (-10dB)+(-15dB)+(-6.5dB) = (-31.5dB), AP may not recognize the signal right?

                2) If we use TUSB542, could cover -31dB loss? If not, How much TUSB542 cover insertion loss(dB)

                     Can you let me know the capable insertion loss value for LineA, LineB seperately?

                       PC(CPU) ----LineA---- TUSB542  -----LineB---- Phone(AP)

  • 0
    TI__Guru**** 179816 points

    Donghun

    You may consider building an USB active cable with TUSB542 placed inside the cable and be bus powered.

    The proposed cable insertion loss is -12dB, the spec'ed USB cable loss is -3.5dB, so you have -8.5dB to compensate. You can set TUSB542 RX equalizer to 6dB and De-emphasis to 3.5dB, this will provide 9.5dB to compensate the 8.5dB loss. This basically bring the design back to the 20dB max loss defined by the spec.

    Thanks

    David