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| 型號(hào)： | IBM42F12SNNAA20 |
| 廠商： | IBM Microeletronics |
| 英文描述： | SFF-1063/1250N-SW PTH Serial Optical Transceiver(SFF-1063/1250N-SW PTH串行光纖收發(fā)器) |
| 中文描述： | SFF-1063/1250N-SW普通話系列光收發(fā)器（SFF-1063/1250N-SW普通話串行光纖收發(fā)器） |
| 文件頁(yè)數(shù)： | 3/7頁(yè) |
| 文件大?。?/td> | 465K |
| 代理商： | IBM42F12SNNAA20 |
Application Note
SFF-1063/1250N-SW PTH Serial Optical Transceiver Design & Layout Guide
optxcvr.fm
July 2000
Page 3
PC Boards
Because the transceiver employs isolated power
islands, multilayer PC boards must be used in the
host board design. Also, some designs require both
chassis and logic grounds on the same board.
Finally, high speed data line routing would be very
difficult without a ground plane under the differential
data pairs.
Grounding Considerations
Ground Tabs
The section of the transceiver chassis nearest the
optical fiber connector has grounding tabs that must
mesh firmly with the rectangular bezel cutout into
which the transceiver is inserted. The bezel must be
part of the main host chassis sheet metal or be well
connected to the main chassis box through multi-
point contacts. Grounding techniques must follow
good UHF/microwave shielding practices. Excessive
Figure 2: Simplified Schematic
U
U
10
Optical
Receive
+Signal
Detect
Optical
Transmit
Transmit
PLL Power
Parallel
Receive
Logic
Power
Parallel
Transmit
SFF OPTICAL
TRANSCEIVER
Optic Fiber
Input
10
0.01
8
4
RxDAT+
9
10
3
TX Clock
Reference
0.01
10
-
Vcc 3.3V
0.01
0.01
10
-
Vcc 3.3V
1
μ
1
μ
H
U
U
10
0.01
0.01
10
-
Vcc 3.3V
1
μ
H
U
U
Impedance
Matching
Network*
-
Impedance
Matching
Network*
-
Receive
PLL Power
SERDES
and
LOGIC FUNCTIONS
10
0.01
0.01
10
-
Vcc 3.3V
1
μ
H
U
U
0.01
0.01
RxDAT-
Tx_DAT+
0.01
0.01
Tx_DAT-
Post-amp
and
Rx_SD
5
Rx_SD
AC
Modulator
DC Driver
and
Safety
Control
Tx_DISABLE
P
R
L
Optic Fiber
Output
10
0.01
0.01
10
-
Vcc 3.3V
* A resistor matching network may be required depending upon SERDES circuit characteristics to match the SERDES to the 50-ohm
line-to-ground and 100-ohm line-to-line impedances of the transmit and receive differential data lines of the SFF optical transceiver.
** Actual values for noise decoupling depend on the host PC board configuration.
All capacitances are in microfarads (
μ
F). 10
μ
F capacitors are tantalum; all others are ceramic.
Notes:
Logic
Ground
Rx GROUND
Tx GROUND
1
7
1
μ
H
U
U
RX Power
Tx Power
6
2
1K **
1K **
0.01
0.01
-
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