HFCT-5201A Agilent Technologies, Inc., HFCT-5201A Datasheet - Page 4

• Manufacturer Part Number: HFCT-5201A
• Description: 155 Mb/s Single Mode Fiber Transceiver For Atm, Sonet OC-3/SDH STM-1 -40C to +85C Black Case
• Manufacturer: Agilent Technologies, Inc.

recommended that a surface-
mount coil inductor of
3.3 µH be used. Ferrite beads can
be used to replace the coil
inductors when using quieter V
supplies, but a coil inductor is
recommended over a ferrite bead.
Coils with a low, series dc
resistance (<0.7 ohms) and high,
self-resonating frequency are
recommended. All power supply
components need to be placed
physically next to the V
the receiver and transmitter. Use a
good, uniform ground plane with a
minimum number of holes to
provide a low-inductance ground
current return for the power
supply currents.
Evaluation Circuit Boards
Evaluation circuit boards imple-
menting this recommended circuit
design are available from Agilent’s
Application Engineering staff.
Contact your local Agilent sales
representative to arrange for
access to one if needed.
Operation in -5.2 V Designs
For applications that require -5.2 V
dc power supply level for true ECL
logic circuits, the HFCT-5201
transceiver can be operated with a
V
This transceiver is not specified
with an operating, negative power
supply voltage. The potential
compromises that can occur with
use of -5.2 V dc power are that the
absolute voltage states for V
and V
due to the 0.2 V difference in
supply levels. Also, noise
immunity may be compromised
for the HFCT-5201 transceiver
because the ground plane is now
the V
suggested power supply filter
circuit shown in Figure 4,
Recommended Circuit Schematic,
should be located in the V
at the transceiver supply pins.
Direct coupling of the differential
data signals can be done between
the HFCT-5201 transceiver and
the standard ECL circuits.
4
CC
= 0 V dc and a V
CC
OL
supply point. The
will be changed slightly
EE
CC
= -5.2 V dc.
EE
pins of
OH
paths
CC
Recommended Solder and Wash
Process
The HFCT-5201 is compatible with
industry standard wave or hand
solder processes.
HFCT-5201 Process Plug
The HFCT-5201 transceiver is
supplied with a process plug for
protection of the optical ports
with the Duplex SC connector
receptacle. This process plug
prevents contamination during
wave solder and aqueous rinse as
well as during handling, shipping
or storage. It is made of
high-temperature, molded, sealing
material.
Recommended Solder Fluxes
and Cleaning/Degreasing
Chemicals
Solder fluxes used with the
HFCT-5201 fiber-optic transceiver
should be water-soluble, organic
solder fluxes. Some recommended
solder fluxes are Lonco 3355-11
from London Chemical West, Inc.
of Burbank, CA, and 100 Flux from
Alpha- metals of Jersey City, NJ.
Figure 5. Recommended Board Layout Hole Pattern
33.02
(1.3)
(0.1)
2.54
(0.1)
2.54
20.32
(0.8)
TOP VIEW
Recommended cleaning and
degreasing chemicals for the
HFCT-5201 are alcohol’s (methyl,
isopropyl, isobutyl), aliphatics
(hexane, heptane) and other
chemicals, such as soap solution
or naphtha. Do not use partially
halogenated hydrocarbons for
cleaning/degreasing. Examples of
chemicals to avoid are 1.1.1.
trichloroethane, ketones (such as
MEK), acetone, chloroform, ethyl
acetate, methylene dichloride,
phenol, methylene chloride or
N-methylpyrolldone.
18 x Ø 0.8 ± 0.1
2 x Ø 1.9 ± 0.1
(0.075 ±0.004)
(0.031 ±0.004)