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TSOP31338 Datasheet(PDF) 5 Page - Vishay Siliconix |
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TSOP31338 Datasheet(HTML) 5 Page - Vishay Siliconix |
5 / 8 page New TSOP311../TSOP313.. Document Number 81763 Rev. 1.0, 09-Aug-07 Vishay Semiconductors www.vishay.com 5 Suitable Data Format The TSOP31#.. series is designed to suppress spurious output pulses due to noise or disturbance signals. Data and disturbance signals can be distinguished by the devices according to carrier frequency, burst length and envelope duty cycle. The data signal should be close to the band-pass center frequency (e.g. 38 kHz) and fulfill the conditions in the table below. When a data signal is applied to the TSOP31#.. in the presence of a disturbance signal, the sensitivity of the receiver is reduced to insure that no spurious pulses are present at the output. Some examples of disturbance signals which are suppressed are: • DC light (e.g. from tungsten bulb or sunlight) • Continuous signals at any frequency • Modulated noise from fluorescent lamps with electronic ballasts For data formats with long bursts (more than 10 carrier cycles) please see the data sheet for TSOP312../TSOP314.. Figure 15. IR Signal from Fluorescent Lamp with low Modulation Figure 16. IR Signal from Fluorescent Lamp with high Modulation 010 15 20 Time (ms) 16920 IR Signal from fluorescent lamp with low modulation 5 010 15 20 Time (ms) 16921 IR Signal from fluorescent lamp with high modulation 10 TSOP311.. TSOP313.. Minimum burst length 6 cycles/burst 6 cycles/burst After each burst of length A gap time is required of 6 to 70 cycles 10 cycles 6 to 35 cycles 10 cycles For bursts greater than A gap time in the data stream is needed of 70 cycles > 1.2 x burst length 35 cycles > 6 x burst length Maximum continuous short bursts/second 2000 2000 Compatible to NEC code yes yes Compatible to RC5/RC6 code yes yes Compatible to Sony code yes no Compatible to RCMM code yes yes Compatible to r-step code yes yes Compatible to XMP code yes yes Suppression of interference from fluorescent lamps Common disturbance signals are supressed (Example: Signal pattern of fig. 15) Even critical disturbance signals are suppressed (Examples: Signal pattern of fig. 15 and fig. 16) |
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