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TUSB216I: Asking for EQ/Boost setting Guidelines of TUSB216I

Jay Yoo
Intellectual 1971 points
Part Number: TUSB216I
Other Parts Discussed in Thread: TUSB216-Q1

Hi expert,

My customer asked a question regarding EQ settings on TUSB216I.

I understood that Edgd/DC boost is helping maintain high/low voltages in the EYE pattern and RX sensitivity help compensate signal’s rise/falling edge timings.

Then, What determines the difference between Boost level 1 and 3 AND RX_SEN Low and High? Please let me know if there is something like an approximate gain value.

Thanks,

Jay

  • +1
    TI__Mastermind 18741 points

    Hi Jay,

    For DC boost and RX sensitivity parameters that determine levels, please refer to the Typical Application and Design Requirements of the datasheet.

    Due to the nature of our USB 2 redriver solution, there is no specific insertion loss (in dB) that accurately corresponds to a particular boost setting of the device. Please find the rough estimates below for AC boost provided by TUSB216-Q1. These numbers are based on eye diagrams in the datasheet and are all typical values. Note that I would recommend starting the redriver to the lowest setting (BOOST: 0, RX_SEN: LOW) and then incrementing the level setting until passing the test.

    AC Boost at 240MHz (typ)

    Boost 0: 3.0 dB
    Boost 1: 3.5 dB
    Boost 2: 4.7 dB
    Boost 3: 5.2 dB

    Best,

    Josh

  • 0 in reply to Josh Baik
    TI__Intellectual 1971 points

    Hi Josh,

    Sorry for re opening this thread. I'd like to double check one thing with you.

    My customer wants to use RXsens resistors for 30K&10K rather than 37.5K&12.5K which is used in the datasheet. As far as I know,  as long as we are maintaining the ratio between the resistors, which in this case is 37.5-12.5K and my customer's 30-10K, that should work. Am I correct?

    Thanks,

    Jay

  • 0 in reply to Jay Yoo
    TI__Mastermind 18741 points

    Hi Jay,

    37.5K & 12.5K ohm are the parameters for the design example.

    Typically, it depends on the input voltage supply and RX_SEN level. Please refer to Input RX_SEN electrical characteristics of the datasheet below.

    For example, if Vcc is 5V used, the minimum high-level input voltage would be more than 3.3V, and the maximum high-level input voltage would be less than 5V.

    If you want to clarify the RXsen resistor parameters, please provide Vcc and RX_Sen level they want. 

    Best,

    Josh