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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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LRIS2K-W4 데이터시트(PDF) 19 Page - STMicroelectronics |
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LRIS2K-W4 데이터시트(HTML) 19 Page - STMicroelectronics |
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19 / 102 page  LRIS2K Communication signal from VCD to LRIS2K 19/102 4 Communication signal from VCD to LRIS2K Communications between the VCD and the LRIS2K takes place using the modulation principle of ASK (Amplitude Shift Keying). Two modulation indexes are used, 10% and 100%. The LRIS2K decodes both. The VCD determines which index is used. The modulation index is defined as [a – b]/[a + b] where a is the peak signal amplitude and b, the minimum signal amplitude of the carrier frequency. Depending on the choice made by the VCD, a "pause" will be created as described in Figure 3 and Figure 4. The LRIS2K is operational for any degree of modulation index from between 10% and 30%. Figure 3. 100% modulation waveform Table 10. 10% modulation parameters Symbol Parameter definition Value hr 0.1 x (a – b) max hf 0.1 x (a – b) max AI06683 tRFF tRFSBL tRFR 105% a t 100% 95% 60% 5% |
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