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TUSB211: difference between TUSB211 and TUSB

Shinichi Inoue
Guru 21696 points
Part Number: TUSB211
Other Parts Discussed in Thread: TUSB212,

Dear Specialists,

My customer is evaluating TUSB211 and TUSB212, so he has a question.

I would be grateful if you could advise.

---

I'd like to know the difference between TUSB211 and TUSB212.

(1) TUSB211 has a DC gain function, TUSB212 has a DC gain and AC gain function, is it correct?

(2)Could you tell me the difference between DC gain and AC gain?

(3)Regarding DC gain, is there a difference of gain between TUSB211 and TUSB212.

(4) Is there any other difference?

---

I appreciate your great help in advance.

Best regards,

Shinichi

  • 0
    TI__Genius 11070 points
    (1) TUSB211 has a DC gain function, TUSB212 has a DC gain and AC gain function, is it correct?
    >>TUSB211 has EQ setting. TUSB212 has EQ setting and DC Boost setting.
    >>DC Boost was added in the TUSB212 to increase the low frequency signal VOD.

    (2)Could you tell me the difference between DC gain and AC gain?
    >>DC Boost increases the low frequency signal VOD. The AC Gain (Called EQ in these devices) is used to set the compensation for high-frequency signaling.

    (3)Regarding DC gain, is there a difference of gain between TUSB211 and TUSB212.
    >>TUSB211 has no DC Gain.

    (4) Is there any other difference?
    >>TUSB211 is primarily for active cable configurations.
  • 0 in reply to Undrea Fields
    Guru 21696 points

    Hi Undrea,

    Thank you for your reply.

    I sent your answer to the customer, he has additional questions.

    I would be grateful if you could advise..

    ---

    Could you please le me know following two questions

    (1)  the detail of low frequency VOD

    Does this mean that Boost effect exists not only for DC but also for low frequency signals?

    (2) What does the active cable configurations mean?

    ---

    I appreciate your great help.

    Best regards,

    Shinichi

  • 0 in reply to Shinichi Inoue
    Guru 21696 points
    Hi Undrea,

    My customer has an additional question.

    I'm sorry for bother you, I would be grateful if you could advise.

    ---Situation

    Actually, a connection error has occurred using TUSB212.

    It was confirmed that by changing to TUSB212 → TUSB211 on the relay board of the defect set and the normal set all the sets work properly.
    Only the device changed.

    (1) About TUSB212, connection error occurs regardless of the settings of Level 0/1/2/3 of AC Boost and level L / M / H of DC_Boost.

    (2) EQ setting of TUSB211 of 0, 1, 2, 3 were checked, and all settings worked without error.

    ---Question
    As a result, trouble was solved simply with TUSB212 → TUSB211.

    What is the reason for this?

    As a difference between TSUB 212 and TUSB211, there is the with or without AC_Boost.

    At this time, it seems that there is a problem with AC_Boost, but is this a possibility correct?
    Could you please let me know about other factors.

    ---

    I appreciate your great help and patience.

    Best regards,
    Shinichi
  • 0 in reply to Shinichi Inoue
    Guru 21696 points

    Hi Undrea,

    This is just a reminder I am looking forward to waiting your answer.

    I appreciate your great help.

    Best regards,

    Shinichi

  • 0 in reply to Shinichi Inoue
    TI__Genius 11070 points
    Hi Shinichi,

    Is the TUSB211/212 placed near the source or device?
    The DC boost added in the TUSB212 is for low-frequency signals (Signals which do not transition for more then 2 bits). The TUSB211 used for active cables which may implement the device in the cable itself, not on the Host or device PCB.
    What type of connection error occurs with the TUSB212? Is the customer using the lowest DC Boost and EQ settings?
  • 0 in reply to Undrea Fields
    Guru 21696 points

    Hi Undrea,

    Thank you for your reply.

    Transmitter -> Cable3m -> TUSB212 board ->  Cable5m -> Receiver

    TUSB212 was NG unless DC_boost disabled by I2C.

    TUSB211 was OK at all gain setting.

    I thought of three possibirities, could you please advise.

    (1) As DC boost becomes larger, the effect of AC boost is attenuated relatively.

    (2) DC boost becomes larger and can not be received beyond the amplitude range of the receiving side

    (3) Other

    Could you please see attached file.

    0160.comparison between output waveforms.xlsx

    I appreciate your great help.

    Best regards,

    Shinichi