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TUSB1002: Change to TUSB1002A

Shuji Ishiwata
Mastermind 6135 points
Part Number: TUSB1002

Hi All,

I am considering changing from TUSB1002 to TUSB1002A.

As for the terminals, 14pin is different. The EQ gain and DC gain settings will also change.

I have confirmed the E2E below. The Rx termination has been changed to GND, but is there any difference in AC coupling capacitance from TUSB1002 to TUSB1002A? Do I need to change anything now that the RX termination has changed?

https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1215459/tusb1002a-differences-from-tusb1002?tisearch=e2e-sitesearch&keymatch=TUSB1002#

Are there any other things I should be aware of when making changes?

Best Regards,

Ishiwata

  • 0
    TI__Genius 14775 points

    Hi Mr. Ishiwata,

    The major change is the Rx termination as you saw in the linked E2E post. This wouldn't require changing AC coupling capacitors, so the high speed signal path can be left the same as with the TUSB1002.

    Aside from this, the EQ values are slightly different on the 1002A

    Shuji Ishiwata said:
    As for the terminals, 14pin is different. The EQ gain and DC gain settings will also change.

    I'm confused by what you mean here. Both the 1002 and the 1002A are 24pin devices. Could you elaborate?

    Best,

    Shane

  • 0 in reply to Shane Hauser
    Mastermind 6135 points

    Hi Shane,

    Thank you for your support.


    14pin of 1002 is SLP_S0#. 14pin of 1002A is DCBOOST#.
    I mentioned this difference.

    I understand that there will be no change in the peripheral circuitry if it is replaced.


    Best Regards,
    Ishiwata

  • 0 in reply to Shuji Ishiwata
    TI__Genius 14775 points

    Hi Mr. Ishiwata,

    Thanks for the reply, I see what you mean.

    Pin 14 of the device on the 1002 will disable/enable the RX detect.

    On the 1002A, this pin will add DC gain to the signal when pulled low.

    There would be no change to the signal lines when replacing the 1002 with the 1002A. If you want the DC gain from pin 14, you could pull this pin low on the 1002A.

    Best,

    Shane