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| 型號(hào)： | HFCT-5215D |
| 英文描述： | Conversion adapters; HRS No: 311-0008-0 40; Connector Type: Adapter; Impedance (ohm): 50; Mating/Unmating Cycles: 5000; Contact Mating Area Plating: Silver; Operating Temperature Range (degrees C): -55 to 85; General Description: BNC-Plug/M-Jack Conversion adapter |
| 中文描述： | 155 Mb / s的ATM的單模激光收發(fā)器。 SONET的OC-3/SDH的STM - 1（L1.1） |
| 文件頁(yè)數(shù)： | 15/20頁(yè) |
| 文件大小： | 503K |
| 代理商： | HFCT-5215D |
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4
Figure 4. Recommended Circuit Schematic for dc Coupling (at +5 V) between Optical
Transceiver and Physical Layer IC
MOUNTING POST
NO INTERNAL CONNECTION
HFBR/HFCT-5208M
TOP VIEW
V
EER
RD
SD
V
CCR
V
CCT
TD
V
EET
1
234
567
89
C2
L1
L2
R2
R3
R1
R4
C5
C3
C4
R9
R10
V
CC FILTER
AT V
CC PINS
TRANSCEIVER
R5
R7
R6
R8
C6
RD
SD
V
CC
TD
TERMINATION
AT PHY
DEVICE
INPUTS
NOTES:
THE SPLIT-LOAD TERMINATIONS FOR PECL SIGNALS NEED TO BE LOCATED AT THE INPUT
OF DEVICES RECEIVING THOSE PECL SIGNALS. RECOMMEND MULTI-LAYER PRINTED
CIRCUIT BOARD WITH 50 OHM MICROSTRIP OR STRIPLINE SIGNAL PATHS BE USED.
R1 = R4 = R6 = R8 = R10 = 130 OHMS.
R2 = R3 = R5 = R7 = R9 = 82 OHMS.
C1 = C2 = C3 = C5 = C6 = 0.1 F.
C4 = C7 = 10 F.
L1 = L2 = 1 H COIL OR FERRITE INDUCTOR (see text comments).
TERMINATION
AT TRANSCEIVER
INPUTS
Rx
Tx
V
CC
V
CC
C1
C7
MOUNTING POST
NO INTERNAL CONNECTION
Maintain a solid, low inductance
ground plane for returning signal
currents to the power supply.
Multilayer plane printed circuit
board is best for distribution of
VCC, returning ground currents,
forming transmission lines and
shielding. Also, it is important to
suppress noise from influencing
the fiber-optic transceiver per-
formance, especially the receiver
circuit. Proper power supply
filtering of VCC for this transceiver
is accomplished by using the
recommended separate filter
circuits shown in Figure 4. These
filter circuits suppress VCC noise
of 100 mV peak-to-peak or less
over a broad frequency range.
This prevents receiver sensitivity
degradation . It is recommended
that surface-mount components
be used. Use tantalum capacitors
for the 10 F capacitors and
monolithic, ceramic bypass
capacitors for the 0.1 F
capacitors. Also, it is
recommended that a surface-
mount coil inductor of 1 H be
used. Ferrite beads can be used to
replace the coil inductors
when using quieter VCC supplies,
but a coil inductor is recom-
mended over a ferrite bead to
provide low-frequency noise
filtering as well. 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
VCC pins of the receiver and
transmitter. Use a good, uniform
ground plane with a minimum
number of holes to provide a low-
inductance ground current return
path for the signal and power
supply currents.
Although the front mounting posts
make contact with the metallized
housing, these posts should not be
relied upon to provide adequate
electrical connection to the plated
housing. It is recommended to
either connect these front posts to
chassis ground or allow them to
remain unconnected. These front
posts should not be connected to
signal ground.
Figure 5 shows the recommended
board layout pattern.
In addition to these recommenda-
tions, Agilent’s Application
Engineering staff is available for
consulting on best layout practices
with various vendors’ serializer/
deserializer, clock recovery/
generation integrated circuits.
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