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TORX177PL Datasheet(PDF) 3 Page - Toshiba Semiconductor

Part # TORX177PL
Description  FIBER OPTIC RECEIVING MODULE FOR DIGITAL AUDIO INTERFACE
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Manufacturer  TOSHIBA [Toshiba Semiconductor]
Direct Link  http://www.semicon.toshiba.co.jp/eng
Logo TOSHIBA - Toshiba Semiconductor

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TORX177PL(F,T)
2006-12-28
3
7. Board layout hole pattern (Recommendation)
8. Precautions on Use
(1)
Absolute maximum rating
The absolute maximum ratings are the limit values which must not be exceeded during operation of
device. None of these rating value must not be exceeded. If the absolute maximum rating value is
exceeded, the characteristics of devices may never be restored properly. In extreme cases, the device
may be permanently damages.
(2)
Soldering
Optical modules are comprised of internal semiconductor devices. However, in principle, optical
modules are optical components. During soldering, ensure that flux does not contact with the emitting
surface or the detecting surface. Also ensure that proper flux removal is conducted after soldering.
Some optical modules come with shutter system. The shutter is closed to avoid malfunction when the
optical module is not in use. Note that it is not dust or waterproof.
As mentioned before, optical modules are optical components. Thus, in principle, soldering where
there may be flux residue and flux removal after soldering is not recommended. Toshiba recommend
that soldering be performed without the optical module mounted on the board. Then, after the board
has been cleaned, the optical module should be soldered on to the board manually.
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 cases, be sure to check the devices' reliability.
(3)
Noise resistance
It is believed that the use of optical transfer devices improve noise resistance. In theory, optical fiber
is not affected by noise at all. However, receiving modules which handle signals whose level is
extremely small, are susceptible to noise.
TOSLINK improve noise resistance to use a conductive case. However, the current signal output by
the optical receiving modules' photodiode is extremely small. Thus, in some environments, shielding
the case may not achieve sufficient noise resistance.
For systems which incorporate TOSLINK, Toshiba recommend testing using the actual device to
check its noise resistance.
Use a simple noise filter on TOSLINK fiber optic transceiving module's power line. If the ripple in the
power supply used is significant, reinforce the filter.
The optical module is to be used in an area which is susceptible to radiated noise, increase the
shielding by covering the optical module and the power line filter with a metallic cover.
(4)
Vibration and shock
This module is plastic sealed and has its wire fixed by resin. This structure is relatively resistant to
vibration and shock. In actual equipment, there are sometime cases in which vibration, shock, or
stress is applied to soldered parts or connected parts, resulting in lines cut. A care must be taken in
the design of equipment which will be subject to high levels of vibration.
(5)
Support pins
The TORX177PL(F,T) has support pins in order to fix itself to the PCB temporary. Please make the
hole for these pins in the PCB under the condition described in board layout hole pattern.
Unit:mm
Recommended PCB thickness:1.6mm
2.61 TYP.
2.625 TYP.
5.6 TYP.
2.54 TYP.
2.54 TYP.
3-φ0.8±0.05
2-φ1.1±0.05
2-φ1.7±0.05


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