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Original question:

TUSB211: Signal variance (jitter) in TUSB211 eye-diagram

TUSB211: TUSB211: The improvement of eye diagram was not obvious

cyan zhou
Expert 1500 points
Part Number: TUSB211

Hi TI Expert,

Now we use TUSB211 on USB 2.0, but The improvement of eye diagram was not obvious.

The trouble is how can we get a obvious result.

This is circuit diagram:

and this is eye diagram  use TUSB211:

and this is eye diagram non-use TUSB211:

Thanks, and wait for your reply.

  • 0
    TI__Guru 60870 points

    Hello Cyan,

    Response will be delayed due to holidays.

    Regards,

    JMMN

  • 0 in reply to JMMN
    TI__Guru 64326 points

    Hi Cyan,

    Is does not look like the TUSB211 is not enable in these eye diagrams. Could you ensure that TUSB211 Vcc is correct and RSTN is at the appropriate level? Also when testing what is th estate of the CD and ENA_HS pins? Could you describe the test setup? Does the Scope have 50 ohm termination enabled when measuring the eye diagram?