DS90UB940-Q1: VTH and VTL value

Kevin Xiong

Expert 2340 points

Part Number: DS90UB940-Q1

Hi,

In the DS90UB940 datasheet, the maximum VTH is +50mV and the minimum VTL is -50mV.

My questions are:

1. If the values of VTH and VTL are beyond the specification, what problem will occur?

2. Is there any issue about the waveform as attachment?

Thanks.

Kevin Xiong

over 7 years ago

0 Steven(Shenzhen) Shi over 7 years ago

TI__Mastermind 30515 points

sorry, the test waveform can't tell us accurately the Vih and Vil spec., please disable the back channel signal, or you can disable the de-ser in your test.
but from this waveform, basically we can get the Vih/Vil is within the >+50mV and <-50mV range (500mV/scale).

regards,
Steven

0 Kevin Xiong over 7 years ago in reply to Steven(Shenzhen) Shi

Expert 2340 points

Hi Steven,
Could you please tell me how to disable the de-ser in the test?
Thanks.
Kevin Xiong

0 Kevin Xiong over 7 years ago in reply to Steven(Shenzhen) Shi

Expert 2340 points

Hi Steven,
Could you please tell me how to disable the de-ser in the test?
Thanks.
Kevin Xiong

0 Steven(Shenzhen) Shi over 7 years ago in reply to Kevin Xiong

TI__Mastermind 30515 points

pls set ub940's reg. 0x63[1]=1b'1 to disable the bc signal.

Steven

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DS90UB940-Q1: VTH and VTL value