CDCLVD1208: DC coupled LVPECL input

Nir Flysher

Expert 3297 points

Part Number: CDCLVD1208

Dear Team,

Can you recommend how to connect the device if the input is LVPECL DC-COUPLED

Regards,

Nir

over 3 years ago

0 Barak Dror over 3 years ago

Prodigy 150 points

Pls also advise, incase driver swing > 1.6Vpp and needs to attenuated (DC coupled).

0 Jennifer Bernal over 3 years ago

TI__Genius 11685 points

Hi Nir,

You could use 240Ω emitter resistors for an LVPECL DC COUPLED input. Please keep in mind that TI does not have an official recommendation as it has not been tested (see this e2e post for further details).

This Application Report also provides illustrations for configuring DC coupled signals. Figure 4 & 5 on pages 4-5 show how to configure a larger swing and typical swing.

Regards,

Jennifer

0 Nir Flysher over 3 years ago in reply to Jennifer Bernal

TI__Expert 3297 points

Hi Jennifer,

Thank you very much for your quick reply.

Could anyone on the team please test this on an EVM and confirm ?

Customer is considering to select this device and needs to know whether he can count on it.

Regards,

Nir.

0 Jennifer Bernal over 3 years ago in reply to Nir Flysher

TI__Genius 11685 points

Hi Nir,

It'll be a few days before I can confirm as the current EVM has AC coupled inputs and it'd require reworking the board to test a DC coupled configuration.

Regards,

Jennifer

Clock & timing

Clock & timing forum

CDCLVD1208: DC coupled LVPECL input