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TSOP1237WI1 Datasheet(PDF) 5 Page - Vishay Siliconix |
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TSOP1237WI1 Datasheet(HTML) 5 Page - Vishay Siliconix |
5 / 8 page VISHAY TSOP12..WI1 Document Number 82022 Rev. 1.7, 27-Jan-05 Vishay Semiconductors www.vishay.com 5 Suitable Data Format The circuit of the TSOP12..WI1 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 TSOP12..WI1 it can still receive the data signal. How- ever the sensitivity is reduced to that level that no unexpected pulses will occur. Some examples for such disturbance signals which are suppressed by the TSOP12..WI1 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 13. Vertical Directivity ϕ y 95 11339p2 0.4 0.2 0 0.2 0.4 0.6 0.6 0.9 0 ° 30 ° 10 ° 20 ° 40 ° 50 ° 60 ° 70 ° 80 ° 1.0 0.8 0.7 drel - Relative Transmission Distance 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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