TSOP12 Vishay, TSOP12 Datasheet - Page 5

• Manufacturer Part Number: TSOP12
• Description: Ir Receiver Modules For Remote Control Systems
• Manufacturer: Vishay

TSOP12..
Vishay Semiconductors
Suitable Data Format
The circuit of the TSOP12.. is designed so that unex-
pected output pulses due to noise or disturbance sig-
nals are avoided. A bandpass filter, an integrator
stage and an automatic gain control are used to sup-
press such disturbances.
The distinguishing mark between data signal and dis-
turbance signal are carrier frequency, burst length
and duty cycle.
The data signal should fulfill the following conditions:
• Carrier frequency should be close to center fre-
quency of the bandpass (e.g. 38 kHz).
• 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 1.8 ms a corre-
sponding 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 (repetitive pulse), NEC Code (repetitive data),
Toshiba Micom Format, Sharp Code, RC5 Code,
RC6 Code, R-2000 Code, Sony Code.
www.vishay.com
66
95 11339p2
1.0
0.9
0.8
0.7
0.6
Figure 13. Vertical Directivity ϕ
d
rel
0.4
- Relative Transmission Distance
0.2
0°
0
0.2
10°
0.4
20°
y
0.6
30°
40°
50°
60°
70°
80°
When a disturbance signal is applied to the TSOP12..
it can still receive the data signal. However the sensi-
tivity is reduced to that level that no unexpected
pulses will occur.
Some examples for such disturbance signals which
are suppressed by the TSOP12.. are:
• DC light (e.g. from tungsten bulb or sunlight)
• Continuous signal at 38 kHz or at any other fre-
quency
• Signals from fluorescent lamps with electronic bal-
last with high or low modulation (see Figure 14 or Fig-
ure 15).
Figure 15. IR Signal from Fluorescent Lamp with high Modulation
Figure 14. IR Signal from Fluorescent Lamp with low Modulation
16921
16920
0
0
IR Signal from fluorescent
lamp with high modulation
IR Signal from fluorescent
lamp with low modulation
10
5
Time (ms)
Time (ms)
10
10
Document Number 82013
15
15
Rev. 1.12, 19-Jan-07
20
20