SN75DP139: how SN75DP139 adjusts EQ

user6175831

Prodigy 35 points

Part Number: SN75DP139

Hello, I would like TO know how SN75DP139 adjusts EQ and the reference design of DP TO DVI, thank you!

over 5 years ago

0 David (ASIC) Liu over 5 years ago

TI__Guru**** 177476 points

Please refer to Figure 18 of the DP139 for the gain vs frequency curve.

Please see attached for the reference design.

sn75dp139_dvi_evm_rev_b.pdf

Thanks

David

0 user6175831 over 5 years ago in reply to David (ASIC) Liu

Prodigy 35 points

Dear David:

Thank you for your reply, in addition, I would like to ask about SN75DP139 DATASHEET mentioned content, whether there are the lines of this part descriptions or explanation, the original content is as follows:

DVI APPLICATION

In DVI application case, it is recommended that between the SN75DP139 TMDS outputs (OUT_Dx) and a

through hole DVI connector a series resistor placeholder is incorporated. This could help in case if there are

signal integrity issues as well as help pass system level compliance.

0 David (ASIC) Liu over 5 years ago in reply to user6175831

TI__Guru**** 177476 points

The resistor is added to the outputs of the driver, thereby increasing the impedance at the line source and preventing signal reflection off the driver end. The resistor value is chosen to match the source and trace impedance.

Thanks

David

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SN75DP139: how SN75DP139 adjusts EQ