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ADUCM350 External Crystal Oscillator

Question asked by Mochi on Jan 12, 2017
Latest reply on Jan 22, 2017 by Mochi

I worry about ADUCM350 External Crystal Oscillator.
Please advise me.

 

It's shown to 10P of a datasheet as follows.

It's mounted on an evaluation board as follows.

Two of capacitor 15pF is added to a crystal oscillator of 32kHz.
Two of capacitor 24pF is added to a crystal oscillator of 16MHz.

I checked BOM of an evaluation board.

7pF fits in with a crystal oscillator of 32kHz and 12pF fits in with a crystal oscillator of 16MHz.

In table 19, 15pF is indicated on 32kHz oscillator and 12pF is indicated on 16MHz oscillator.

 

Is a key word "symmetrical load"?

In 32kHz crystal oscillator need 15pF & 15pF=7.5pF.(symmetrical load 15pF?)

In 16MHz crystal oscillator need 24pF & 24pF=12pF.

Am I right?

 

 

best regards,

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