Package
The overall package concept
for these devices consists of
the following basic elements;
two optical subassemblies, two
electrical subassemblies and
the housing as illustrated in
the block diagram in Figure 3.
The electrical subassemblies
consist of high volume
multilayer printed circuit
boards on which the IC and
various surface-mounted
passive circuit elements are
attached.
The housing is then encased
with a metal EMI protective
shield. The case is connected
to signal ground and we
recommend soldering the four
ground tabs to host card signal
ground.
The package outline drawing
and pin out are shown in
Figures 4 and 5. The details of internal shield for the
this package outline and pin
out are compliant with the
multisource definition of the 2
x 5 DIP. The low profile of the fields.
Agilent transceiver design
complies with the maximum
height allowed for the LC
connector over the entire
length of the package.
The receiver electrical
subassembly includes an
The PCBs for the two electrical
subassemblies both carry the
signal pins that exit from the
bottom of the transceiver. The
solder posts are fastened into
the molding of the device and
are designed to provide the
mechanical strength required
to withstand the loads
imposed on the transceiver by
mating with the LC
connectored fiber cables.
Although they are not
electrical and optical
subassembly to ensure high
immunity to external EMI
The optical subassemblies are
each attached to their
respective transmit or receive
electrical subassemblies. These
two units are then fitted
within the outer housing of the
transceiver that is molded of
filled nonconductive plastic to
provide mechanical strength.
connected electrically to the
transceiver, it is recommended
to connect them to chassis
ground.
RX SUPPLY
NOTE
DATA OUT
DATA OUT
PIN PHOTODIODE
PREAMPLIFIER
SUBASSEMBLY
QUANTIZER IC
RX GROUND
SIGNAL
DETECT
LC
TX GROUND
RECEPTACLE
DATA IN
DATA IN
Tx DISABLE
LASER BIAS
MONITORING
LASER
OPTICAL
SUBASSEMBLY
LASER DRIVER
AND CONTROL
CIRCUIT
LASER DIODE
MODULATOR
TX SUPPLY
CASE
NOTE: NOSE CLIP PROVIDES CONNECTION TO CHASSIS GROUND FOR BOTH EMI AND THERMAL DISSIPATION.
Figure 3. Block Diagram
4