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參數(shù)資料
| 型號： | S3029 |
| 廠商： | Applied Micro Circuits Corp. |
| 英文描述： | Clock Synthesis and Recovery Unit(數(shù)據(jù)傳送速率155 MBit/S的時鐘合成和恢復(fù)單元) |
| 中文描述： | 時鐘合成及回收機（數(shù)據(jù)傳送速率155兆比特/秒的時鐘合成和恢復(fù)單元） |
| 文件頁數(shù)： | 4/4頁 |
| 文件大?。?/td> | 65K |
| 代理商： | S3029 |
Applied Micro Circuits Corporation
6195 Lusk Blvd., San Diego, CA 92121 (619) 450-9333
4
S3029 TO WAC-413 AND 3.3V OPTICAL MODULE APPLICATIONS NOTE
Terminations
This design utilizes 3.3V PECL logic, therefore the terminations of the lines will be discussed here. PECL outputs of
the WAC-413 are open source drivers. This means that the driver sources current for a high signal output but tri-states
for a low signal output. Therefore, the resistor termination scheme used determines the logic Low voltage (~1.6V) for
a PECL output when the driver goes tri-state.
1.
The impedance seen by the source on all of the clock and data lines should be designed to be 50 ohms and the
trace impedance on the signals shown should be matched to the impedance of the termination network. All the
traces should be kept as short as possible to reduce transmission line effects.
2.
The 100 ohm line to line termination resistors should be placed as close to the termination points as possible.
3.
The 400 ohm pull down resistors should be as close to the sources as possible.
4.
The 100 ohm pull up and 94 ohm pull down resistor networks should be placed as close as possible to the
termination points.
5.
The 91 ohm pull up, 62 ohm pull down and the 51 ohm series resistors, should be placed as close as possible
to the termination point (REFCLKP/N).
6.
The termination network shown at the input of the 3.3V 1x9 F/O XCVR at the TxD/TxDn* signals should be placed
at only one of the four pairs of signals. The network should be placed at the module furthest away from the source.
7.
At the input to the WAC-413 shown at the *TS_SER_CLK+/- 3 inputs, the 100 ohm resistor line to line should be
placed only on the longest line pair.
8.
All the termination resistors should be placed at the end of the transmission line and the power supply decoupling
should be placed as close as possible to the devices. Refer to the S3029 layout application note for specific power
and ground decoupling and isolation rules.
9.
The PECL (differential pairs) traces should have equal length (allows both lines to arrive at the destination at the
same time) and be run in parallel and in close proximity of one another. This allows the same noise to couple onto
both of the lines and become common mode noise which is ignored by differential inputs.
Conclusion
The S3029, WAC-413, and the 3.3V Optical Modules is a low power, small footprint solution for Quad STS-3/
STM-1 applications.
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