LMK04803BEVAL: OSCin* and OSCin of LMK04803B EVM

Hirotaka Matsumoto

Part Number: LMK04803BEVAL

Hi all

Would you mind if we ask LMK04803BEVAL(LMK04803B EVM)?

Is there the polarity between OSCin* and OSCin?
Usually, we assume that OSCin is for OSCinP(hot), however on EVM, OSCin pin setting is AC coupling with GND.
Could you give us this reason?

Kind regards,

Hirotaka Matsumoto

over 4 years ago

0 Hirotaka Matsumoto over 4 years ago

Guru 27585 points

Hi team

We guess that your days are so busy, however if you have some update, could you share us?

Kind regards,

Hirotaka Matsumoto

0 Kia Rahbar over 4 years ago

TI__Expert 8585 points

Hello Hirotaka,

By default, these SMAs are not connected to the traces going to the OSCin/OSCin* pins of the LMK04803BEVAL. Instead, the single-ended output of the onboard VCXO (U2) drives the OSCin* input of the device and the OSCin input of the device is connected to GND with 0.1 uF.

Regards,

Kia Rahbar

0 Hirotaka Matsumoto over 4 years ago in reply to Kia Rahbar

Guru 27585 points

Kia san

Thank you for your reply!

OK, just in case, we would like to confirm.

In case of AC-single end input ;
External VCXO output connects to OSCin* input.
AC coupling with GND connects to OSCin input.

Is it correct?

Kind regards,

Hirotaka Matsumoto

0 Kia Rahbar over 4 years ago in reply to Hirotaka Matsumoto

TI__Expert 8585 points

Hello Hirotaka,

That is correct.

Regards,

Kia Rahbar

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LMK04803BEVAL: OSCin* and OSCin of LMK04803B EVM