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TSOP322 bảng dữ liệu(PDF) 5 Page - Vishay Siliconix

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Giải thích chi tiết về linh kiện  IR Receiver Modules for Remote Control Systems
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TSOP322 bảng dữ liệu(HTML) 5 Page - Vishay Siliconix

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VISHAY
TSOP322..UH1
Document Number 82222
Rev. 1, 28-Apr-03
Vishay Semiconductors
www.vishay.com
5
Suitable Data Format
The circuit of the TSOP322..UH1 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 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.
When a
disturbance signal is applied
to
the
TSOP322..UH1 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 TSOP322..UH1 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 Figure 15).
Figure 13. Sensitivity vs. Supply Voltage
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
VS – Supply Voltage ( V )
17185
Figure 14. IR Signal from Fluorescent Lamp with low Modulation
Figure 15. IR Signal from Fluorescent Lamp with high Modulation
0
5
10
15
20
Time ( ms )
16920
IR Signal from fluorescent
lamp with low modulation
0
5
10
15
20
Time ( ms )
16921
IR Signal from fluorescent
lamp with high modulation


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