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.

over 5 years ago

0 JMMN over 5 years ago

TI__Guru 60870 points

Hello Cyan,

Response will be delayed due to holidays.

Regards,

JMMN

0 Malik Barton57 over 5 years ago 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?

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