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TSDP343 Datasheet(PDF) 5 Page - Vishay Siliconix |
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TSDP343 Datasheet(HTML) 5 Page - Vishay Siliconix |
5 / 7 page TSDP341.., TSDP343.. www.vishay.com Vishay Semiconductors Rev. 1.1, 22-Aug-14 5 Document Number: 82667 THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 SUITABLE DATA FORMAT Theses receivers are designed to suppress spurious output pulses due to noise or optical disturbances. The devices can distinguish data signals from noise due to differences in frequency, burst length, and envelope duty cycle. For optimum sensitivity, the data’s modulation frequency should be close to the device’s band-pass center frequency (e.g. 38.4 kHz) and fulfill the conditions in the table below. When a data signal is applied to the receiver in the presence of noise, the sensitivity of the receiver is automatically reduced by the AGC to insure that no spurious pulses are present at the receiver’s output. Some examples of noise which is suppressed: • DC light (e.g. from tungsten bulbs sunlight) • Continuous signals at any frequency • Strongly or weakly modulated patterns from fluorescent lamps with electronic ballasts (see fig. 13 or fig. 14). Fig. 13 - IR Disturbance from Fluorescent Lamp with Low Modulation Fig. 14 - IR Disturbance from Fluorescent Lamp with High Modulation 010 15 20 Time (ms) 16920 5 010 15 20 Time (ms) 16921 5 TSDP341.. TSDP343.. Minimum burst length 6 cycles/burst 6 cycles/burst After each burst of length A gap time is required of 6 to 70 cycles ≥ 7 cycles 6 to 35 cycles ≥ 7 cycles For bursts greater than a minimum gap time in the data stream is needed of 70 cycles > 1.2 x burst length 35 cycles > 6 x burst length Maximum number of continuous short bursts/second 3000 3000 Suppression of interference from fluorescent lamps Mildly modulated noise patterns are suppressed (fig. 13) Strongly modulated noise patterns are suppressed (fig. 14) |
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