iMX 8M Mini SOM impedance issue

[shai_b]

Hello Team,

My customer has sent our imx 8m mini reference design SOM (from the EVK) to PCB manufacturer but they could not achieve the requested 50 Ohms(tolerance 10%) impedance after they careful calculate again, they only can reach to 48 Ohms(tolerance 10%)

Here are the two rise questions, I will appreciate your advice 

A. Dose the impedance is 48 Ohms(tolerance 10%) is acceptable?

B. In case the impedance must be 50 Ohms(tolerance 10%), is allowed to adjust the following

The inner copper thickness adjust to 0.5 OZ
The inner line width adjust to 3.7MIL

Please advise back, Thanks in advance 

Best regards,

Shai

[shai_b]

Hi Yuri‌,

Thank you for your fast response, your inputs have been highly valued.

Regards,

Shai

[Yuri]

shai.b@telsys.co.il 

Hello,

  I do not think, that PCB trace impedance of 48 OHm instead of 50 OHm

significantly influences on signals; so, say shortly - acceptable.

Regards,

Yuri.