CDCE62002: about XTAL / AUX_IN pin

Masazumi Ishii

Part Number: CDCE62002

Hello.

I have a question about CDCE62002.

We are planning to use it as a Clock Cleaner as shown in Datasheet P31 Figure.29.
Do I need to enter XTAL / AUX_IN?
If it is not necessary, how can I handle XTAL / AUX_IN_pin?
Is there a problem when I open it?

Thank you.

over 5 years ago

0 Alan O over 5 years ago

TI__Mastermind 32575 points

You can leave the XTAL input open/floating if you are an external clock input as the PLL reference.

Alan

0 Masazumi Ishii over 5 years ago in reply to Alan O

Genius 3945 points

Hello.

thank you for your answer.

I made a prototype board.
We will use CDCE 62002 as Clock Cleaner.
The XTAL / AUX_IN pin is considered unnecessary and it is open.
Data Sheet P 21 9.3.5.2 Smart Multiplexer Dividers
In REF select mode, TI recommends connecting AUX_IN to GND with a 1 - k pulldown resistor.
And there.
When the XTAL / AUX_IN pin is open/floating, what is the problem?
IC destroy, malfunction. Other

Thank you.

0 Lane Boyd over 5 years ago in reply to Masazumi Ishii

TI__Genius 16845 points

If XTAL / AUX_IN is floating, it is possible that the Smart MUX will select XTAL to source the input divider even though it is not present. Floating the pin does not introduce the risk of destruction.

Kind regards,
Lane

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CDCE62002: about XTAL / AUX_IN pin