nRF 52840 PCB design

[Maksim]

I am designing a pcb just the nRF 52840 MCU. The design of the PCB is based on the reference design from Nordic. 
When ordering the PCB I came across a problem that the vias under the MCU are too small and too close together to be able to order the PCB for a 
normal price. 
I have been informed that the technique with which this can be done properly is a laser technique that companies like Eurocircuits.com do not have. 
This means that I cannot realize the design before this problem can be solved. The chip is constructed in such a way that the vias must be so small. 
Is there an alternative where I can order the PCB for a normal price or are there cheaper design options that reduce the costs?

[Andreas]

Hi,

 

If you do not use all the GPIOs you do not need vias for the pins that are not in use. If using a few of the innermost pins you could try to use larger vias, but you should then submit your design here for a review (you may open a private ticket so it is not publicly visible).

I have also seen examples where the innermost pins have been routed out between the outermost pins, but this is also something that probably comes at a cost. Unfortunately it is hard to get the best of bothworlds, and not expect having to pay extra for it.

 

Using many large and through vias breaks up and degrades the grounding of the IC. There are sensitive modules onboard that require good grounding to operate properly.

 

Also see this application note: https://infocenter.nordicsemi.com/topic/nan_040/APP/nan_040/nan40_intro.html?cp=11_0

 

Best regards,

Andreas