DP83826E: Voltage mode or Current mode Ethernet PHY

Hirotaka Matsumoto

Part Number: DP83826E

Hi all

Would you mind if we ask document slyp788(which is relation to etherphy DP83826)?
https://www.ti.com/seclit/ml/slyp788/slyp788.pdf

On the document P5 to P6, it shows the description voltage mode or current mode Ethernet PHY.

<Question1>
The description : "To generate a symbol either a -1V or a +1V signal is needed"
These -1V or +1V means Differential Output Voltage in case of 100Base-TX?

<Question1>
The description : "To generate a 1V signal : 2 x 1V/50 Ω = 40mA per data pair"
About this "2 x 1V", could you let us know it meaning?

Kind regards,

Hirotaka Matsumoto

over 3 years ago

0 Alvaro (Al-vuh-roe) Reyes over 3 years ago

TI__Mastermind 19621 points

Hi Hirotaka,

The 826 is Voltage Driven, could you provide me with a use case for using it in Current Mode?

Regards,

Alvaro

0 Hirotaka Matsumoto over 3 years ago in reply to Alvaro (Al-vuh-roe) Reyes

Guru 27595 points

Alvaro san

Thank you for your reply.

We also know that the 826 is Voltage Driven.
What we know is the formula of slyp788.

<Question1>
The description : "To generate a symbol either a -1V or a +1V signal is needed"
These -1V or +1V means Differential Output Voltage in case of 100Base-TX?

<Question2>
The description : "To generate a 1V signal : 2 x 1V/50 Ω = 40mA per data pair"
About this "2 x 1V", could you let us know it meaning?

Kind regards,

Hirotaka Matsumoto

+1 Alvaro (Al-vuh-roe) Reyes over 3 years ago in reply to Hirotaka Matsumoto

TI__Mastermind 19621 points

Hi Hirotaka,

We are not aware of the source of the document you provided. We cannot comment on the assumptions made in the document's claims.

Regards,

Alvaro

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DP83826E: Voltage mode or Current mode Ethernet PHY