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TSOP1833SS3VA Datasheet(PDF) 3 Page - Vishay Siliconix |
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TSOP1833SS3VA Datasheet(HTML) 3 Page - Vishay Siliconix |
3 / 7 page TSOP18..SS3VA Vishay Telefunken 3 (7) Rev. 2, 13-Jun-00 www.vishay.de • FaxBack +1-408-970-5600 Document Number 82133 Suitable Data Format The circuit of the TSOP18..SS3VA 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 mark between data signal ( not suppressed) and disturbance signal (supressed) are carrier frequency, burst length and Signal Gap Time (see diagram below). The data signal should fullfill 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 a gap time of at least 9 cycles is neccessary. • The data format should not make a continuous signal transmission. There must be a Signal Gap Time (longer than 25ms) at least each 150ms (see Figure A) Some examples for suitable data format are: NEC Code (repetitive pulse), NEC Code (repetitive data), Toshiba Micom Format, Sharp Code, RC5 Code, RECS–80 Code, R–2000 Code. When a disturbance signal is applied to the TSOP18..SS3VA it can still receive the data signal. However the sensitivity is reduced to that level that no unexpected pulses will occure. Some examples for such disturbance signals which are suppressed by the TSOP18..SS3VA are: • DC light (e.g. from tungsten bulb or sunlight), • Continuous signal at 38kHz or at any other frequency, • Signals from fluorescent lamps (see figure B). • Continuous IR signal (e.g. 1ms burst, 2ms pause) 0 20 40 60 80 100 120 140 time [ms] Signal Gap Time Figure A: Data Signal (Output of IR Receiver) with a Signal Gap Time of 45ms 0 2 4 6 8 10 1214 1618 20 time [ms] Signal Gap Time Figure B: Disturbance Signal from Fluorescent Lamp with Signal Gap Time of 7ms (suppressed by TSOP18..SS3V) |
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