We are using Murata's 4MHz ceramic resonator (CSTCR4M00G53-R0) in one of our designs and request help in PCB layout design around the ceramic resonator. The below Murata's FAQs page suggests not to place any GND plane under the ceramic resonator. Picture in page is attached below.
We are using a 4 layer PCB with continuous GND plane in layers 1,2 & 4 and continuous power plane in layer 3.
Please help us with the questions below:
Should we provide a copper clearance area under the ceramic resonator in the inner layers also i.e. layers 2, 3 & 4, or is it sufficient if we just clear the GND plane in the top layer?
Is it recommended to place GND stitching vias around the tesonator (green dots as shown in below image) or should we completely avoid any vias around the resonator?