2.5
Daughterboard layout
Different choice regarding the number of the layers can be used. A two-layers or an N-layers (where N can be 3
or 4) application board can be used to develop the board for the L99ASC03G application.
The EVAL-L99ASC03 daughterboard was designed in a 2 layers board because:
•
A 2-layers design typically requires a little more care with the PCB routing but can be successfully
implemented for a low number of tracks. The power supply trace on the component is made quite thick
to present as low as impedance trace possible. Large areas of ground on the side of the board provide a low
impedance path for the decoupling.
•
A 2-layers PCB is cheaper to manufacture than a 3 or 4 layers solution.
The Top and Bottom layers are shown in the following figures. Gerber files of the daughterboard can be found in
the ST website.
Figure 9.
Assembly Top
Figure 10.
Assembly Bottom
UM2983
Daughterboard layout
UM2983
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Rev 1
page 10/17
