TOTX193
2. Recommended Operating Conditions
Characteristics
Supply Voltage
High Level Input Voltage
Low Level Input Voltage
Symbol
V
CC
V
IH
V
IL
Min
4.75
2.0
0
Typ.
5.0
―
―
Max
5.25
V
CC
0.8
Unit
V
V
V
3. Electrical and Optical Characteristics
(Ta = 25°C, V
CC
= 5 V)
Characteristics
Data Rate
Transmission Distance
Pulse Width Distortion
Fiber Output Power
Peak Emission Wavelength
Current Consumption
High Level Input Voltage
Low Level Input Voltage
High Level Input Current
Low Level Input Current
(Note 4)
∆tw
P
f
λ
p
I
CC
V
IH
V
IL
I
IH
I
IL
R = 8.2 k
Ω
Symbol
Test Condition
NRZ Code
(Note 2)
Min
DC
0.2
−25
−21
―
―
2.0
―
―
―
Typ.
―
―
―
―
660
15
―
―
―
―
Max
6
10
25
−15
―
25
―
0.8
20
−0.4
Unit
Mb / s
m
ns
dBm
nm
mA
V
V
µA
mA
Using APF (Note 3), TORX193
Pulse width 165 ns
Pulse cycle 330 ns, C
L
= 10
p
F
Using TORX193
APF 1 m, R = 8.2 kΩ
(Note 5)
Note 2: For data rate > 3 Mb / s, the duty factor must be such as kept 25 to 75%.
LED is on when input signal is high level, it is off when it is low level.
Note 3: All Plastic Fiber (980 / 1000 µm)
Note 4: Between input of TOTX193 and output of a fiber optic receiving module TORX193.
Note 5: Measure with a standard optical fiber with fiber optic connectors. Valued by peak.
2
2001-08-10
TOTX193
5. Application Circuit
6. 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.
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 causes 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, Toshiba recommends that you check the life characteristics.
Depending on the environment conditions, Toshiba recommends maintenance such as regular checks
on the amount of optical output.
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. Toshiba 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.
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, resultingin line cut. Attention must be paid to
the design of the mechanism for applications which are subject to large amounts of vibration.
Fixing fiber optical transceiving module
Solder the fixed pin (pins 5 and 6) of fiber optic transmitting module TOTX193 to the printed circuit
board to fix the module to the board.
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.
Protective cap
When the fiber optic transmitting module TOTX193 is not in use, use the protective cap.
(2)
(3)
(4)
(5)
(6)
(7)
5
2001-08-10
DSP and ARM Processors
京公网安备 11010802033920号
EEWORLD
