How do I use a SMD crystal with 4 pins? I am running my arduino project with the atmega328 chip like this:



I have purchased by mistake this crystal:



The reason why I purchased by mistake that crystal was because it has this description:


  16MHz ±10ppm 22pF 60Ω SMD-3225 SMD Crystal Resonators RoHS


I thought that it contained the 22pF ceramic capacitors inside. But latter I learned that I still the 22pf ceramic capacitors. (Please correct me if I am wrong)

Anyways how can I use that crystal? I only know how to connect the 2 pin crystal. Since this crystal has 4 pins now I am confused. 

To me it makes sense to connect it like this:


Connect pins 9 and 10 from atmega --TO--> pins 1 and 3 from the crystal.
Connect pins 2 and 4 from crystal --TO--> Ground
Connect the 22pf ceramic capacitors to pins 1 and 3 from crystal and ground like in the first diagram.
this is a nice question. Once for a project I stumbled upon this problem too. 

The way you described the connection should work perfectly fine. 


  To me it makes sense to connect it like this:
  Connect pins 9 and 10 from atmega --TO--> pins 1 and 3 from the crystal.
  Connect pins 2 and 4 from crystal --TO--> Ground
  Connect the 22pf ceramic capacitors to pins 1 and 3 from crystal and ground like in the first diagram.


Keep it going and greetings from Switzerland.