DP83826I: DP83826 Cap on CEXT pin

JosefMieslinger

Intellectual 2170 points

Part Number: DP83826I

Dear TI Team,

my customer would like to use DP83826I in his design.

According to the datasheet on the CEXT pin a 2nF CAP to GND should be attached.

In the EVM schematic we show a 1nF CAP populated.

Can you please clarify what CEXT pin and the CAP attached is used for in DP83826 device.

Please clarify which CAP value is the right one to be populated.

Thanks and best regards,

Joe

over 5 years ago

0 Hermann Weigl over 5 years ago

Prodigy 70 points

If possible it would be best to have a range for the value for the capacitor of the CEXT to be able to select one out of the otherwise used values.

0 Justin Lazaruk over 5 years ago in reply to Hermann Weigl

TI__Expert 7040 points

Hi Joe,

The correct CEXT value is listed on the datasheet. Please use a 2nF capacitor on this pin.

Regards,
Justin

0 JosefMieslinger over 5 years ago in reply to Justin Lazaruk

TI__Intellectual 2170 points

Hi Justin,

thanks for the quick response!

Can you please also comment on the other questions?

- If possible it would be best to have a range for the value for the capacitor of the CEXT to be able to select one out of the otherwise used values?

- Can you please clarify what CEXT pin and the CAP attached is used for in DP83826 device?

Thanks and best regards,

Joe

0 Hermann Weigl over 5 years ago in reply to JosefMieslinger

Prodigy 70 points

Hi Justin,

I ask, because at the Eval-Board a 1nF is used. Also the value 2n is not so common then 2n2.

Thank you for you help in advance!

Hermann

0 Justin Lazaruk over 5 years ago in reply to Hermann Weigl

TI__Expert 7040 points

Hi Hermann,

What I see on the DP83826 EVM on TI.com, it looks like there is a 0.1uF capacitor on CEXT. I've confirmed that this is outdated and noted the schematic should be updated to 2nF. Can you help point me to where you see a 1nF capacitor?

A 2.2nF capacitor on CEXT is acceptable.

Regards,
Justin

0 Hermann Weigl over 5 years ago in reply to Justin Lazaruk

Prodigy 70 points

Hi Justin,

thank you for the information with 2n2 and that Eval schematics are outdated!

1n was a typo, of course the value I mean was 0.1u

Regards,

Hermann

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DP83826I: DP83826 Cap on CEXT pin