LED/PHOTO IC
Red LED/Photo IC for optical link
L7140-10/S7141-10
For 50 Mbps optical link
Features
Applications
L7140-10
l
Peak emission wavelength: 650 nm
l
High output power
l
High-speed response
l
DC to 50 Mbps data transmission
l
Miniature size due to monolithic IC structure
l
Designed to be used with L7140-10
l
Digital output
l
Inversion logic
S7141-10
l
Data transmission in FA or OA applications subject to large
l
High-speed, short distance data transmission
l
Burst data transmission
amounts of electro magnetic noise
I
Absolute maximum ratings (Ta=25
擄C)
Parameter
Symbol
Value
Reverse voltage
V
4
5
L7140-10
40
Forward current
I
.
Power supply
Vcc
-0.5 to +7
S7141-10
Output current
Ioh
10
Power dissipation *
P
250
Operating temperature
Topr
-10 to +70
Storage temperature
Tstg
-40 to +85
Soldering
-
230 擄C, 5 s, at least 1.5 mm away from package surface
*1: Derate power dissipation at a rate of 1.75
m W /擄C above Ta=25 擄C
Unit
V
mA
V
mA
mW
擄C
擄C
-
I
Electrical and optical characteristics (L7140-10) (Ta=25
擄C)
Parameter
Symbol
Condition
Data rate
f
,
Driven by recommended circuit
Forward voltage
V
.
I
.
=20 mA
Reverse current
I
4
V
4
=5 V
I
.
=10 mA *
Fiber coupled optical power
Po
I
.
=20 mA *
I
.
=20 mA
Peak wavelength
lp
Spectral half width (FW HM)
I
.
=20 mA
Dl
Rise time at pulse drive
tr
I
.
=20 mA, driven by recommended circuit *
!
Fall time at pulse drive
tf
I
.
=20 mA, driven by recommended circuit *
!
*2: Output from a 1 meter long plastic fiber (GH4001 made by Mitsubishi Rayon) set close
*3: Output optical waveform is defined by the waveform shown below.
Min.
Typ.
DC
-
-
1.9
-
-
-10
-
-7
-
-
650
-
20
-
-
-
-
to the m olded lens.
Max.
50
2.3
10
-
-
-
-
8
8
Unit
Mbps
V
碌A
dBm
nm
nm
ns
ns
I
Output optical waveform
definition
80 %
I
L7140-10 output optical
waveform example
I
Drive circuit example
(R1=300
鈩?
R2=750
鈩?
C1=77 pF)
Vcc
0.1
m
F
1 14 74ACT08
3
2
7
C1
R1
1
2
3
4
L7140-10
0.1
m
F
R2
SIGNAL INPUT
20 %
tr
tf
KLEDC0015EB
KLEDC0014EB
* This is merely an example of drive circuit and not for actual large-
volume production purposes.
5 ns/div.
KLEDC0019EA
1
2
