LMK00304: 50Ω termination of OSCin

Yuji Matsumoto

Part Number: LMK00304

Tool/software:

Hi TI team.

I am considering inputting an LVCMOS 3.3V oscillator into the OSCin of LMK00304.

In the reference circuit of Figure 27 in the datasheet, it is terminated with 50Ω.

Is it possible to remove this 50Ω termination?

Regards,

Matsumoto

0 vicente flores prado over 1 year ago

Hello Matusumoto-san,
I would keep it to prevent reflections.

Regards,

Vicente

0 Yuji Matsumoto over 1 year ago in reply to vicente flores prado

Thank you for your reply.

Is it safe to assume that there are no issues other than reflection?

I am also concerned about whether it is possible to directly connect 3.3V since there is no mention of VIH and VIL for OSCin in the datasheet.

Regards,

Matsumoto

+1 vicente flores prado over 1 year ago in reply to Yuji Matsumoto

That should be fine.
Clkin is a better input that OSCIN for better performance.

Regards,

Vicente

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