DS80PCI402: DC common mode volgate spec for CML RECEIVER INPUTS (IN_n+, IN_n-)

daisuke kawasaki

Expert 4535 points

Part Number: DS80PCI402
Other Parts Discussed in Thread: TUSB1044, TUSB1002A

Hi expert,

What is the DC common mode voltage spec for CML RECEIVER INPUTS (IN_n+, IN_n-) of DS80PCI402?

Thank you for your advice.

Thank you and best regards,

Daisuke KAWASAKI

over 6 years ago

0 Nasser Mohammadi over 6 years ago

TI__Guru* 93670 points

Greetings Kawasaki-San,

DS80PCI402 CML receivers have internal 50-Ohm connected to VDD. This is called positive CML and it is referenced to VDD - tied to either 2.5V or 3.3V.

Please note, we require AC coupling to input. Therefor input common mode voltage is isolated from the transmitting device and this parameter should not matter.

Regards,,nasser

0 daisuke kawasaki over 6 years ago in reply to Nasser Mohammadi

TI__Expert 4535 points

Hi Nasser-san,

Greetings. I hope you are doing well.

Sorry, what is the Vtx-dc-cm (Tx DC peak-peak common mode voltage) of this device? This is not described in the datasheet.

Other high speed redriver device like TUSB1002A, TUSB1044 is specifying that parameter.

Thank you and best regards,

Daisuke KAWASAKI

0 Lee Sledjeski over 6 years ago in reply to daisuke kawasaki

TI__Mastermind 43795 points

Greetings Kawasaki-San,

The Vtx-dc-cm of the DS80PCI402 is between 0.7V and 1.1V depending on the output voltage settings. This falls within the PCIe specification of 0V - 3.6V.

Regards,

Lee

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DS80PCI402: DC common mode volgate spec for CML RECEIVER INPUTS (IN_n+, IN_n-)