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參數(shù)資料
| 型號(hào)： | APTX179LT |
| 英文描述： | PHOTOLINK Optical TX/RX Modules |
| 中文描述： | PHOTOLINK光發(fā)射/接收模塊 |
| 文件頁(yè)數(shù)： | 9/10頁(yè) |
| 文件大小： | 439K |
| 代理商： | APTX179LT |
Ampson Technology, Inc.
APTX179J
9/10
8/15/2003 REV1.1
BLOCK DIAGRAM
TTL
BUFFER
AMP
IN
Vcc
LED
DRIVER
PRECAUTIONS DURING USE
1) Maximum rating
The maximum ratings are the limit values which must not be exceeded when using the device. Any one of
the rating must not be exceeded. If the maximum rating is exceeded, the characteristics may not be
recovered. In some extreme cases, the device may be permanently damage.
2) Life of light emitters
When the optical module is used for over a long period, degeneration of characteristics is mostly due to
lowering of the fiber output power (Pf). This is caused by the degradation of the optical output of the LED’s
used as the light source. The cause of degradation of the optical output of the LED’s may be defects in wafer
crystallization or mold resin stress. The detailed caused are, however, not clear.
The life of light emitters is greatly influenced by operating conditions and usage environment as well as the
life characteristics unique to the device. Thus, when selecting a light emitter and setting the operating
conditions, Ampson recommends that you check the life characteristics.
Depending on the environment conditions, Ampson recommends maintenance such as regular checks on
the amount of optical output.
3) Soldering
Optical modules use semiconductor devices internally. However, in principle, optical modules are optical
components. At soldering, take care that flux dose not contact the emitting surface or detecting surface. Also
take care at flux removal after soldering. Some optical modules come with protective cap. The protective cap
is used to avoid malfunction when the optical module is not in use. Not that it is not dust or waterproof.
As mentioned before, optical modules are optical component. Thus, in principle, soldering where there may
be flux residue or flux removal after soldering is not recommended. Ampson recommends that soldering be
performed without the optical module mounted on the board. Then, after the board is cleaned, solder the
optical module manually. Do not perform any further cleaning. If the optical module cannot be soldered
manually, use non-halogen (chlorine-free) flux and make sure, without cleaning, there is no residue such as
chlorine. This is one of the ways to eliminate the effects of flux. In such a case, check the reliability.
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