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TUSB211: What is the compensation rate of TUSB211

Peter Wei
Expert 3030 points
Part Number: TUSB211

Hi Team,

My customer is a big company, they have the people to operate a lib system. If the project engineer need the redriver, they will go to their link, click on the signal type, and how many db they want the redriver to compensate.

For TUSB211, since they have some projects need to use it, so they are planning to input this part to their system. But since we do not have how many dB, or how long the trace or cable can be compensated. So they are asking for the data, ideally, if we can tell how many dB insert lost will be very idea. If we have some test result, tell how long the cable or trace can be compensated, it is also good.

Best Regards,

Peter Wei

  • 0
    TI__Guru 64326 points

    Hi Peter,

    Our USB2 redrivers are not like USB3 redriver that implement a CTLE to compensate for signal integrity in terms of "dB". Please refer Table 1. TUSB2XX EQ and Boost settings in the TUSB2XX Implementation Guide for some estimations that could work here. It is not ideal but I would recommend using a "Low", "Medium", and "High" approach based on the best settings from eye diagram testing in the different designs.

  • 0 in reply to Malik Barton57
    TI__Expert 3030 points

    Hi Malik,

    Here are two questions from the customer:

    1. For example, EQ setting of TUSB211 is 2, in the paper, we said it approximate 3dB. The customer want us to tell, how many dB on pre channel, how many dB on post channel, so they will know how to suggest on the PCB.

    2. we said 3dB, is it base on 480Mbps/240Mhz?

    Best Regards,

    Peter Wei

  • 0 in reply to Peter Wei
    TI__Guru 64326 points

    Hi Peter,

    1. Since the USB trace is shorted underneath our device these is no traditional pre and post channel. Total channel loss should not exceed the "dB" estimate.  This table is only meant to be an approximate to give customer a rough idea of what can be done with the redrivers.

    2. Correct, estimate is based on 240MHz.