LITE-ON
TECHNOLOGY
CORPORATION
Property of Lite-On only
Photo Modules for PCM Remote Control Systems
■
Available Types For Different Carrier Frequencies
Type
LTOP-4830
LTOP-4836
LTOP-4838
LTOP-4856
■
Description
The LTOP-48.. – 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
30 kHz
36 kHz
38 kHz
56 kHz
Type
LTOP-4833
LTOP-4837
LTOP-4840
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
•
Suitable burst length
≥10
cycle/burst
■
Special Features
•
Small size package
•
Enhanced immunity against all
kinds of disturbance light
•
No occurrence of disturbance
pulses at the output
•
Short settling time after power on
•
Continuous data transmission possible (800
bit/s)
■
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
Page :
1
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8
Part No. : LTOP-48.. SERIES DATA SHEET
BNS-OD-C131/A4
LITE-ON
■
Block Diagram
TECHNOLOGY
CORPORATION
Property of Lite-On only
Input
Control
Circuit
3
Rpu
40k
Ω
Vs
1
OUT
PIN
AGC
Band
Pass
Demodu-
lator
2
GND
■
Absolute Maximum Ratings (T
amb
=25
o
C
)
Parameter
Test Conditions
Supply Voltage
Supply Current
Output Voltage
Output Current
Junction Temperature
Storage temperature
Operating temperature
Power Consumption (T
amb
≤85
o
C)
Soldering temperature t≤10s, 1mm from case
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
50
260
Unit
V
mA
V
mA
o
C
o
C
o
C
mW
o
C
■
Basic Characteristics
Parameter
(T
amb
=25
o
C)
Symbol Min Typ Max
0.8 1.1 1.5
I
SD
1.4
I
SH
Vs
4.5
5.5
V
OSL
0.25
L
Ee min
Ee min
Ee max
ϕ
H1/2
ϕ
V1/2
30
±60
±45
35
0.3
0.2
Unit
mA
V
V
m
0.6 mW/m
2
0.4 mW/m
2
W/m
2
deg
deg
Test conditions
Vs=5V, Ev=0
Supply current (Pin3)
Vs=5V,Ev=40klx,sunlight
Supply voltage (Pin3)
Output voltage low
Iosl=0.5mA, Ee=0.7m W/m
2
Ev=0, test signal see fig 7,
Transmission distance
IR diode LTE-3271, I
F
=250mA
Pulse width tolerance: tpi-5/fo<
Irradiance (56kHz)
tpo<tpi+6/fo,test signal see fig.7
Pulse width tolerance: tpi-5/fo<
Irradiance (30-40kHz)
tpo< tpi+6/fo, test signal see fig.7
Irradiance
tpi-5/fo< tpo< tpi+6/fo
Directivity(horizontal) Angle of half transmission distance
Directivity(vertical)
Angle of half transmission distance
Part No. : LTOP-48.. SERIES DATA SHEET
BNS-OD-C131/A4
Page :
2
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LITE-ON
■
Application Circuit
LTOP-48..
Lite-on
LTE-3271
series
TECHNOLOGY
CORPORATION
Property of Lite-On only
R1 220
Ω
*)
3
4.7
µ
F*)
+Vs(+5V)
R2 >2.4k
Ω
optional
**)
1
PIN
2
µ
C
GND
*) Recommended to suppress power supply disturbances
**) The output voltage should not be hold continuously at a voltage below 3.3V by the external circuit.
■
Suitable Data Format
The circuit of the LTOP-48.. is designed in
that way that unexpected output pulses due to
noise or disturbance signals are avoided. A
bandpassfilter, 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 10 cycles/burst or
longer
•
After each burst which is between 10 cycles
and 70 cycles a gap time of at least 14 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 4 times longer than the burst.
•
Up to 800 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, R-2000 Code.
When a disturbance signal is applied to the
LTOP-48.. 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-48.. 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 with high or low modulation (see fig. A
or fig. B)
Part No. : LTOP-48.. SERIES DATA SHEET
BNS-OD-C131/A4
Page :
3
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8
LITE-ON
■
Typical Characteristics
TECHNOLOGY
CORPORATION
Property of Lite-On only
(T
amb
=25
℃
unless otherwise specified)
E
e min
- Threshold Irradiance (mW/m
2
)
E
e min
/ E
e
- Rel. Responsitivity
1.0
0.8
0.6
0.4
0.2
0
f = f
0
± 5%
f(3dB)=f
0
/10
2.0
1.6
1.2
0.8
0.4
0
0
f (E)= f
0
0.7 0.8 0.9 1.0 1.1 1.2 1.3
f / f
0
- Relative Frequency
0.4
0.8
1.2
1.6
2.0
E - Field Strength of Disturbance (kV/m)
FIG.1 Frequency Dependence of
Responsivity
E
e min
- Threshold Irradiance (mW/m
2
)
FIG.4 Sensitivity vs.
Electric Field Disturbances
10
f = f
0
10kHz
1kHz
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0.1
t
po
- Output Pulse Length(ms)
Input burst duration
1
100Hz
λ
=950nm,
optical test signal, fig.7
1
10
100
1000 10000
0.1
0.01
0.1
1
10
100 1000
Ee - Irradiance(mW/m
2
)
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
4.5
Correlation with ambient light sources
(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-48.. SERIES DATA SHEET
BNS-OD-C131/A4
Page :
4
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8
LITE-ON
TECHNOLOGY
CORPORATION
Property of Lite-On only
Ton,Toff - Output Pulse Length(ms)
Ee
Optical Test Signal
(IR diode TSAL6200, I
F
=0.4A, 30 pulses, f=f
0
, T=10ms)
t
p1
*
T
t
p1
* > 10/f
0
is recommended for optimal fuction
V
O
V
OH
V
OL
t
Output Signal
1) 7/f
0
< td < 15/f
2) t
po
=t
pi
±6/f
td
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
)
t
FIG.10 Output Pulse Diagram
S(
λ
)
rel
- Relative Spectral Sensitivity
t
po
2
FIG.7 Output Function
Ee
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
600
µ
s
t
Output Signal
λ
- Wavelength(nm)
Ton
Toff
t
FIG.11 Relative Spectral Sensitivity
vs. Wavelength
0
Relative Radiant Intensity
o
FIG.8 Output Function
0.8
Envelope Duty Cycle
10
o
20
o
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
f=38kHz
30
o
40
1.0
0.9
0.8
0.7
50
o
o
V
H
0.5 0.3
0.1
0.2 0.4 0.6
60
70
80
90
o
o
o
o
10 20 30 40 50 60 70 80 90
Burstlength [number of cycles/burst]
d
rel
- Relative Transmission Distance
FIG.9 Max. Envelope Duty Cycle vs. Burstlength
FIG.12 Directivity
Part No. : LTOP-48.. SERIES DATA SHEET
BNS-OD-C131/A4
Page :
5
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