I am starting to design one of my first instances where I think impedance matching/ reflections might be an issue.
I plan on using a four layer board, signal, gnd, power, signal with ground pours and vias.
Using the rule of thumb of 1/10 wavelength, at 2MHz the 1/10 is 149m, which is well below my 8m distance but I would rather tread on the safety side:
- I used this trace impedance calculator aiming for 50 ohm impedance. Is this the right impedance to aim for? Is this calculator suitable for my four layer stack up?
- Development boards, such as this one , seem to use SMA connectors, but in the interest of reducing BOM cost and number of cables is there a signal connector that can be used for this differential cabling at this frequency. I cannot find one spec'd for this application or maybe because of the 'relatively' low frequency it doesn't a special cable. I am currently thinking, shielded with a differential pair but the cable with 50 ohm characteristic impedance.
Any help would be greatly appreciated!