On those little SMD crystal eg Abracon ABM3B (http://www.abracon.com/Resonators/abm3b.pdf)
they have 4 pads.
2 for the crystal and 2 for GND.
Do they need BOTH gnds connected?
(Please say if that's a guesstimate or if factual).
I can't get an answer from Abracon.
Crystal connections - smd
Moderators: David Barker, Jerry Messina
Guestimate (educated one tho) is that a single ground could be connected as they will most likely be internally connected to the metal can, easy test is to test for continuity ftom one ground to the other , if they are short then only 1 definitely needs a ground connection
If you can read this you are too close