LITE-ON TECHNOLOGY CORPORATION
Property of Lite-On only
Photo Modules for PCM Remote Control Systems
■
Available Types For Different Carrier Frequencies
Type
Fo
Type
LTOP-4130
30 kHz
LTOP-4133
LTOP-4136
36 kHz
LTOP-4137
LTOP-4138
38 kHz
LTOP-4140
LTOP-4156
56 kHz
■
Description
The LTOP-41.. – series are miniaturized
receivers for infrared remote control systems.
PIN diode and preamplifier are assembled on
lead frame, the epoxy package is designed as IR
filter.
The demodulated output signal can directly be
decoded by a microprocessor. The main benefit
is the reliable function even in disturbed ambient
and the protection against uncontrolled output
pulses.
Fo
33 kHz
36.7 kHz
40 kHz
■
Features
•
Photo detector and preamplifier in one package
•
Internal filter for PCM frequency
•
TTL and CMOS compatibility
•
Output active low
•
Improved shielding against electrical field
disturbance
•
Small size package
•
High immunity against ambient light
•
Enhanced data rate of 2400 bit/s
•
Suitable burst length
≥6
cycle/burst
■
Applications
•
TV sets
•
Video recorders
•
Sat receivers
•
DVD
•
Slide projectors
•
Audio components
•
Air conditioner
•
Data communication
•
Game equipment
•
Sensors and light barrier systems for long
distances
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Part No. : LTOP-41.. SERIES DATA SHEET
BNS-OD-C131/A4
LITE-ON TECHNOLOGY CORPORATION
Property of Lite-On only
■
Block Diagram
3
Input
Control
Circuit
30k
Ω
1
PIN
AGC
Band
Pass
Demodu-
lator
2
GND
OUT
Vs
■
Absolute Maximum Ratings (Ta
mb
=25
o
C
)
Parameter
Supply Voltage
Supply Current
Output Voltage
Output Current
Junction Temperature
Storage temperature
Operating temperature
Power Consumption
Soldering temperature
Test Conditions
(Pin3)
(Pin3)
(Pin1)
(Pin1)
Symbol
V
s
I
s
V
o
I
o
T
j
T
stg
T
amb
P
tot
T
sd
Value
-0.3…5.5
5
-0.3…5.5
5
100
-25…+85
-25…+85
30
260
Unit
V
mA
V
mA
o
C
o
C
o
C
mW
o
C
(T
amb=25
C)
t≤10s, 1mm from case
o
■
Basic Characteristics (Tamb=25
o
C)
Parameter
Test conditions
Symbol Min Typ
Supply current (Pin3) Vs=5V, Ev=0
I
SD
1.2
Supply voltage (Pin3)
Vs
2.7
Output voltage low
Iosl=0.5mA, Ee=0.7mW/m
2
V
OSL
(Pin 1)
Ev=0, test signal see fig 8,
Transmission distance
L
35
IR diode LTE-3371, I
F
=250mA
Pulse width tolerance:
Irradiance (30-40kHz) tpi-5/fo<tpo< tpi+5/fo,test signal
E
e min
0.2
see fig.8
Pulse width tolerance:
Irradiance (56kHz)
tpi-5/fo<tpo< tpi+5/fo,test signal
E
e min
0.3
see fig.8
30
Irradiance
E
e max
Directivity(horizontal) Angle of half transmission distance
ϕ
H1/2
±60
Directivity(vertical)
Angle of half transmission distance
ϕ
V1/2
±45
Max Unit
mA
5.5
V
0.25
V
m
0.4
mW / m
2
0.5
mW / m
2
W / m
2
deg
deg
Part No. : LTOP-41.. SERIES DATA SHEET
BNS-OD-C131/A4
Page :
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LITE-ON TECHNOLOGY CORPORATION
Property of Lite-On only
■
Application Circuit
Application Circuit
LTOP-41..
3
Lite-on
LTE-3371
series
R1 100
Ω
*)
4.7
µ
F*)
R2>10k
Ω
optional
**)
+Vs
1
PIN
2
µ
C
GND
*) Recommended to suppress power supply disturbances.
■
Suitable Data Format
The circuit of the LTOP-41.. is designed in
that way that unexpected output pulses due to
noise or disturbance signals are avoided. A
bandpass filter, an integrator stage and an
automatic gain control are used to suppress
such disturbances.
The distinguishing marks between data
signal and disturbance signal are carrier
frequency, burst length and duty cycle.
The data signal should fulfill the following
condition:
•
Carrier frequency should be close to center
frequency of the bandpass (e.g. 38kHz)
•
Burst length should be 6 cycles/burst or
longer
•
After each burst which is between 6 cycles
and 70 cycles a gap time of at least 10 cycles is
necessary
•
For each burst which is longer than 1.8ms a
corresponding gap time is necessary at some
time in the data stream. This gap time should be
at least same length as the burst.
•
Up to 2200 short bursts per second can be
received continuously.
Some examples for suitable data format are:
NEC Code, Toshiba Micom Format, Sharp
Code, RC5 Code, RC6 Code, RCMM code
R-2000 Code, RECS-80 code.
When a disturbance signal is applied to the
LTOP-41.. it can still receive the data signal.
However the sensitivity is reduced to that level
that no unexpected pulses will occur.
Some examples for such disturbance signals
which are suppressed by the LTOP-41.. are:
•
DC light (e.g. from tungsten bulb or sunlight)
•
Continuous signal at 38kHz or at any other
frequency
•
Signals from fluorescent lamps with electronic
ballast (an example of the signal modulation is
shown in figure below).
Part No. : LTOP-41.. SERIES DATA SHEET
BNS-OD-C131/A4
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LITE-ON TECHNOLOGY CORPORATION
Property of Lite-On only
■
Typical Characteristics (T
amb
=25
℃
unless otherwise specified)
E
e min
/ E
e
- Rel. Responsitivity
1.0
0.8
0.6
0.4
0.2
0
0.7 0.8 0.9 1.0 1.1 1.2 1.3
f / f
0
- Relative Frequency
Threshold Irradiance (mW/m
2
)
2.0
1.6
1.2
0.8
0.4
0
0
f (E)= f
0
e min
-
f = f
0
±5%
f(3dB)=f
0
/7
E
0.4
0.8
1.2
1.6
2.0
E - Field Strength of Disturbance (kV/m)
FIG.1 Frequency Dependence of
Responsivity
Threshold Irradiance (mW/m
2
)
FIG.4 Sensitivity vs.
Electric Field Disturbances
10
f = f
0
10kHz
1kHz
t
po
- Output Pulse Length(ms)
0.30
0.25
0.20
0.15
0.10
0.05
0
0.1
1
10
100
1000 10000
Ee - Irradiance(mW/m
2
)
λ
=950nm,
optical test signal, fig.7
Input burst duration
1
100Hz
e min
-
E
0.1
0.01
0.1
1
10
100 1000
V
sRMS
- AC Voltage on DC Supply Voltage(mV)
FIG.2 Sensitivity in Dark Ambient
FIG.5 Sensitivity vs.
Supply Voltage Disturbances
E
e min
- Threshold Irradiance(mW/m
2
)
E
e min
- Threshold Irradiance(mW/m
2
)
5.0
sources
4.5
Correlation with ambient light ~
(Disturbance effect):10W/m
2
=1.4klx
~
4.0
(Stand.illum.A, T=2855K) =8.2klx
(Daylight, T=5900K)
3.5
3.0
2.5
2.0
Ambient,
λ
=950nm
1.5
1.0
0.5
0
0.01 0.10 1.00 10.00 100.00
E - DC Irradiance(W/m
2
)
1.0
Sensitivity in dark ambient
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
-30 -15 0 15 30 45 60 75 90
Tamb - Ambient Temperature(°C)
FIG.3 Sensitivity in Bright Ambient
FIG.6 Sensitivity vs. Ambient Temperature
Part No. : LTOP-41.. SERIES DATA SHEET
BNS-OD-C131/A4
Page :
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LITE-ON TECHNOLOGY CORPORATION
Property of Lite-On only
Ton,Toff - Output Pulse Length(ms)
Ee
Optical Test Signal
(IR diode LTE-3371, I
F
=0.4A, N=6 pulses, f=f
0
, T=10ms)
t
p1
*
T
t
p1
* > 6/f
0
is recommended for optimal fuction
V
O
V
OH
V
OL
td
t
Output Signal
1) 3/f
0
< td < 9/f
0
2) t
pi
-5/f
0
<t
po
<t
pi
+5/f
0
1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0.1
Ton
Toff
λ
=950nm,
optical test signal, fig.8
1
10
100
1000 10000
Ee - Irradiance(mW/m
2
)
FIG.10 Output Pulse Diagram
t
po
2
t
FIG.7 Output Function
Ee
S(
λ
)
rel
- Relative Spectral Sensitivity
1.2
1.0
0.8
0.6
0.4
0.2
0
750
850
950
1050
1150
Optical Test Signal
600
µ
s
T=60ms
V
O
V
OH
V
OL
Ton
Toff
600
µ
s
t
Output Signal
λ
- Wavelength(nm)
t
FIG.11 Relative Spectral Sensitivity
vs. Wavelength
0
o
FIG.8 Output Function
10
o
20
o
o
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0 10 20 30 40 50 60 70 80 90
Burstlength [number of cycles/burst]
30
Relative Radiant Intensity
Envelope Duty Cycle
40
1.0
0.9
0.8
50
o
o
V
0.7
60
70
80
90
0.2 0.4 0.6
o
o
o
o
H
0.5 0.3 0.1
d
rel
- Relative Transmission Distance
FIG.9 Max. Envelope Duty Cycle vs. Burstlength
FIG.12 Directivity (V=vertical; H=horizontal)
Part No. : LTOP-41.. SERIES DATA SHEET
BNS-OD-C131/A4
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