Variations on this suggested PC board layout are possible as long as the general
principles of grounding, shielding, guarding, and spacing are employed. For
example, using a suitable fixture, the LPT-11 transceiver pins can be formed into a
right angle before the transceiver is soldered onto the PC board. In this case, the
layout in figure 2.2 would be modified to accommodate horizontal (90°) mounting of
the transceiver. If the transceiver is bent to the left in figure 2.2, then C1 should be
moved up and to the right, above L1. L1 and C2 can shift down slightly to minimize
the trace lengths for L1, C1 and C2 in this variation on the original layout. Note
that the ground plane on the solder side of the board becomes more important in this
variation since the ground pin of C1 is now on the right-hand side of the transceiver,
and a low-impedance path between the ground pins for C1 and C2 is needed.
Neuron Chip
and
Application Electronics
+5V
GROUND
CLK
C1
L1
C2
C3
NETWORK
CONNECTOR
LPT-11
Figure 2.2
Recommended PC Board Layout for LPT-11 Transceiver
L
ON
W
ORKS
LPT-11 Transceiver User’s Guide
2-5
