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About CLKIN of AD7740

Question asked by 王一一 on Jun 14, 2017
Latest reply on Jun 29, 2017 by JellenieR

AD7740 CLKIN drived by 32.768kHz external clock.

When I used cylinder type crystal with 12.5pF Load capacitor ,AD7740 can work.

When I used  surface mount type crystal with 12.5pF Load capacitor,AD7740 can not work.

 

In datasheet page.8, I get the infomation about 32kHz watch crystal needed external circuitry.

 

MY question is  the 32khz watch crystal means 32.768kHz crystal ?

And  when I used cylinder type crystal with 12.5pF Load capacitor , AD7740 always can work without the external circuitry.

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