ampson technology, inc. APTX179LT 1/6 3/6/2003 rev.1.0 fiber optic transmitting module features 1) conform to eiaj standard cp-1201 (for digital audio interfaces including fiber optic inter-connections). 2) ttl interface. 3) led is driven by differential circuit. 4) +5v single power supply. 5) high speed signal transmission (12.5m nrz signal). 6) esd tolerance ic > 8kv. 7) standard package (panel mount type). applications 1) digital audio equipment:cd, md and dvd player to sound applications for personal computers and computer entertainment systems. 2) navigation system. maximum ratings (ta=25 o c) characteristic symbol rating units supply voltage vcc -0.5 to 7 v input voltage v in -0.5 to vcc+0.5 v operating temperature topr -20 to 70 o c storage temperature tstg -30 to 80 o c ordering information a p t x 1 7 9 l t t:transmitter r:receiver l: shutter type
ampson technology, inc. APTX179LT 2/6 3/6/2003 rev.1.0 recommended operating conditions and electrical characteristics (ta=25 o c , vcc=5v) characteristic symbol condition min typ max units operating voltage vcc 4.75 5 5.25 v operating current iop - 8 13 ma transmitter wavelength p - 660 - nm transmitter light power pf *1 -21 - -15 dbm data rate t nrz code *2 dc - 12.5 mb/s pulse width distortion tw pulse width 80ns pulse cycl e 160ns, c l =10pf using aprx179 -25 - 25 ns jitter tj - 4 25 ns low to high delay time t plh - 100 180 ns high to low delay time t phl - 100 180 ns high level input voltage v ih 2.0 - - v low level input voltage v il - - 0.8 v high level input current i ih - - 20 a low level input current i il - - -0.4 ma *1: fiber insertion measure peak value. *2: for data rate > 12mb/s(nrz), the duty factor must be such as kept 25 to 75%. mechanical characteristics (ta=25 o c) characteristic symbol condition min typ max units insertion force *1 - - 40 n withdrawal force *1 6 - 40 n torque for self-tap using self-tapping screw (m3*8) 60 - 100 n-cm *1: using standard optical fiber cable. (970/1000 um)
ampson technology, inc. APTX179LT 3/6 3/6/2003 rev.1.0 test circuit unit to be measured gnd vcc vin vcc input 12.5mb/s nrz, duty 50% standard receiver ch2 ch1 oscilloscope input signal t plh t phl 50% 50% standard receiver output output signal stand optical fiber cable (1 meter) tjr tjf comments no. test item symbol 1 low to high pulse delay time t plh 2 high to low pulse delay time t phl 3 pulse width distortion ? tw = t phl - t plh ? tw 4 high level output voltage v oh 5 low level output voltage v ol
ampson technology, inc. APTX179LT 4/6 3/6/2003 rev.1.0 APTX179LT outline dimension unit: mm recommended drilling as viewed from the soldering face
ampson technology, inc. APTX179LT 5/6 3/6/2003 rev.1.0 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 reliab ility.
ampson technology, inc. APTX179LT 6/6 3/6/2003 rev.1.0 4) vibration and shock this module is resin-molded construction with wire fixed by resin. this structure is relatively sound against vibration or shock. in actual equipment, there are some cases where vibration, shock, and stress is applied to soldered parts or connected parts, resulting in line cut. attention must be paid to the design of the mechanism for applications which are subject to large amounts of vibration. 5) fixing fiber optical transceiving m odule solder the fixed pin of fiber optic transmitting module aptx179xx to the printed circuit board to fix the module to the board. 6) solvent when using solvent for flux removal, do not use a high acid or high alkali solvent. be-careful not to pour solvent in the optical connector ports. if solvent is inadvertently poured there, clean with cotton tips. 7) protective cap when the fiber optic transmitting module aptx179xx is not in use, use the protective cap. 8) supply voltage use the supply voltage within the typ. operating condition (vcc = 5 0.25v). make sure that supply voltage does not exceed the maximum rating value of 7v, even instantaneously. 9) input voltage if a voltage exceeding the maximum rating value (vcc+0.5v) is applied to the transmitter input, the internal ic may degrade causing some damage. if excessive voltage due to surge may be added to the input, insert a protective circuit. 10) soldering condition solder at 260 o c or less within ten seconds. 11) precaution on waste when discarding devices and packing materials, follow procedures stipulated by local regulations in order to protect the environment against contamination. compound semiconductors such as gaas are used as led materials for this module. when discarding waste or at final processing, attention must be paid to workers and the environment. 12) precaution on use ampson is continually working to improve the quality and the reliab ility of its pr oducts. nevertheless, semiconductor devices in general can malfunction or fail due to their inherent electrical sensitivity and vulnerab ility to physical stress. it is the res ponsib ility of the buyer, w hen ut ilizing ampson products, to observe standards of safety, and to avoid situations in which a malfunction or failure of a ampson product could cause loss of human life, bodily injury or damage to property. in developing your designs, please ensure that ampson products are used within specified operating ranges as set forth in the most recent product specifications.
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