LMK00334: How to input DC-coupled LVDS clock to the LMK00334

Koichi Kajihara

Part Number: LMK00334
Other Parts Discussed in Thread: LMK00338EVM

I want to input DC-coupled LVDS clock to the LMK00334.
LMK00338EVM reccomends to implements series capatcitors following the 100-Ω termination like (A) .
However, I want to reduce the series capacitors like (B)
Please tell us about the impact of reduceing this capacitor.

Thanks

over 3 years ago

0 Kia Rahbar over 3 years ago

TI__Expert 8585 points

Hello Koichi,

For a DC-coupled LVDS input, (B) is the correct termination. (A) is for an AC-coupled LVDS input.

Since you require a DC-coupled LVDS input, you do not require the capacitors.

Regards,

Kia Rahbar

0 Koichi Kajihara over 3 years ago in reply to Kia Rahbar

Prodigy 50 points

Thanks for answering my isssue.

Can we input LMK00334RTVT to typical LVDS with a common mode voltage of 1.2V?

Thanks.

0 Kia Rahbar over 3 years ago in reply to Koichi Kajihara

TI__Expert 8585 points

Hello Koichi,

Yes, it should not be a problem.

Here is a link that can provide you an overview of LVDS technology: LVDS Overview. This document discusses LVDS terminations and common mode voltage, so I believe it will be a great resource for you to reference.

Regards,

Kia Rahbar

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LMK00334: How to input DC-coupled LVDS clock to the LMK00334