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| 型號(hào)： | HFCT-5218M |
| 英文描述： | 622 Mb/s Single Mode Laser Transceiver for ATM, SONET OC-12/SDH STM-4 (L4.1)(應(yīng)用于ATM, SONET OC-12/SDH STM-4 (L4.1)的622 Mb/s單模式激光收發(fā)器) |
| 中文描述： | 622 Mb / s的對(duì)ATM，SONET的OC-12/SDH的STM - 4（L4.1）（應(yīng)用于自動(dòng)取款機(jī)，SONET的OC-12/SDH的STM - 4（L4.1）的622桶/單模激光收發(fā)器擰單模式激光收發(fā)器） |
| 文件頁(yè)數(shù)： | 3/16頁(yè) |
| 文件大?。?/td> | 493K |
| 代理商： | HFCT-5218M |
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3
Applications Information
Recommended Circuit
Schematic
When designing the HFCT-5218M
circuit interface, there are a few
fundamental guidelines to follow.
For example, in the Recommended
Circuit Schematic, Figure 3, the
differential PECL data lines
should be treated as 50 Ohm
Microstrip or stripline
transmission lines. This will help
to minimize the parasitic
inductance and capacitance
effects. Proper termination of the
differential data signal will
prevent reflections and ringing
which would compromise the
signal fidelity and generate
unwanted electrical noise. Locate
terminations at the received
signal end of the transmission
line. The terminations should be
the standard Thevenin-equivalent
50 ohm to V
CC
- 2 V termination.
Other standard PECL terminating
techniques may be used. The
length of these lines should be
kept short and of equal length to
prevent pulse-width distortion
from occurring. For the high-
speed signal lines, differential
signals should be used, not
single-ended signals. These
differential signals need to be
loaded symmetrically to prevent
unbalanced currents from
flowing which will cause
distortion in the signal.
The Signal Detect (SD) output of
the receiver is PECL logic and
must be loaded if it is to be used.
The signal detect circuit is much
slower that the data path, so the
ac noise generated by an
asymmetrical load is negligible.
Power consumption may be
reduced by using a higher than
normal load impedance for the SD
output. Transmission line effects
are not generally a problem as
the switching rate is slow.
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
V
CC
, 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
Figure 3. Recommended Circuit Schematic for dc Coupling (at +5 V) between
Optical Transceiver and Physical Layer IC
MOUNTING POST
NO INTERNAL CONNECTION
HFCT-5218M
TOP VIEW
V
EE
1
RD
2
RD
3
SD
4
V
CC
5
V
CC
6
TD
7
TD
8
V
EE
9
C2
L1
L2
R2
R3
R1
R4
C5
C3
V
FILTER
AT V
PINS
TRANSCEIVER
C4
R9
R10
R5
R7
R6
R8
C6
RD
RD
SD
V
CC
TD
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 μF.
C4 = C7 = 10 μF.
L1 = L2 = 1 μH COIL OR FERRITE INDUCTOR (see text comments).
TERMINATION
AT TRANSCEIVER
INPUTS
Rx
Rx
Tx
Tx
V
CC
V
CC
C1
C7
MOUNTING POST
NO INTERNAL CONNECTION
circuit. Proper power supply
filtering of V
CC
for this
transceiver is accomplished by
using the recommended separate
filter circuits shown in Figure 3.
These filter circuits suppress V
CC
noise greater than 100 mV peak-
to-peak or less over a broad
frequency range. This prevents
receiver sensitivity degradation .
It is recommended that surface-
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