Datasheet
14
PCB Layout Suggestion
The following PCB layout shows a
recommended layout that should
result in good electrical and EMI
performance. Things to note:
1. The ground plane should be
continuous under the part, but
should not extend under the
shield trace.
2. The shield trace is a wide, low
inductance trace back to the
system ground.
3. The AGND pin is connected to the
ground plane and not to the shield
tab.
4. C1 is an optional V
CC
filter
capacitor; it may be left out if the
Vcc is clean.
5. V
LED
can be connected to either
unfiltered or unregulated power.
If C1 is used, and if V
LED
is
connected to V
CC
, the connection
should be before the C1 cap.
Component Side
Circuit Side
VLED
TXD
RXD
SHUTDOWN
V
CC
SHIELD
GROUND
C1