3.2.2 Implementation Example

The SAMA7G54 MPU is available in a single 14x14 mm², 0.65 mm pitch, 343-ball TFBGA package, optimized for standard class PCB layout (down to four layers).

To achieve the best performance, we recommend using the following layer stack-ups and line width and clearances.

Figure 3-4. 4-Layer Stack-up

More complex designs using the SAMA7G54 MPU can be implemented on a PCB with a stack-up of six layers.

Figure 3-5. 6-Layer Stack-up

If the required line characteristic impedance values are met, similar eight-layer (or more) stack-ups can be used.

These stack-ups were chosen because they can provide all the required impedances by using minimum 100 µm-wide traces.

The minimum trace width is 100 µm (~4 mil) which is relatively standard nowadays for PCB manufacturers. This also ensures that the routing does not take much space on the board.