AN2479

Design guidelines for PCB schematic and layout

Doc ID 12956 Rev 2

13/23

In order to dissipate heat, it is mandatory to have a large ground plane on both layers (top

and bottom) and to solder the slug on the PCB.

Figure 16.

Dissipating the heat

Solder the PLL filter as close as possible to the FILT pin.

Figure 17.

PLL filter

Large ground plane

PLL filter