User Manual

Jennic
JennicJennic
Jennic
76 JN-DS-JN5139 v1.5 © Jennic 2008
B.3.2 PCB Requirements
Jennic recommend that a standard 4–layer printed circuit board be used for design, with the individual layers
organised as shown below in .
Copper (0.5 oz – 17 µm)
Copper (0.5 oz – 17 µm)
Copper (0.5 oz – 17 µm)
Copper (0.5 oz – 17 µm)
A
B
A
Dielectric FR4 pre-preg 0.009” x 1
Dielectric FR4 0.02” x 1
Dielectric FR4 pre-preg 0.009” x 1
Dimension (mm) Description Dimension Tolerance (mm)
Top Metal 0.017 0.5oz copper
Dielectric 1 0.2286 Er = 4.2 to 4.4 Dimension A 0.01
Mid 1 metal 0.017 0.5oz copper
Dielectric 2 0.508 Er = 4.2 to 4.4 Dimension B 0.01
Mid 2 metal 0.017 0.5oz copper
Dielectric 3 0.2286 Er = 4.2 to 4.4 Dimension A 0.01
Bottom metal 0.017 0.5oz copper
Total 1.0322
Figure 51: PCB Cross-Section
From top to bottom, the layers are:
• Component
• Ground
• Digital tracks
• Power and tracks
The material is standard FR4. While no special measures are required for the board design, it is recommended that
Class 1 tolerances be used.
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 Note : The Jennic PCB layout assumes the layers defined above. If a different PCB thickness
is used then the RF track thickness and layout will need to be re-assessed.