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LRIS64K Datasheet(PDF) 21 Page - STMicroelectronics |
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LRIS64K Datasheet(HTML) 21 Page - STMicroelectronics |
21 / 100 page LRIS64K Communication signal from VCD to LRIS64K Doc ID 15336 Rev 11 21/100 6 Communication signal from VCD to LRIS64K Communications between the VCD and the LRIS64K takes place using the modulation principle of ASK (Amplitude Shift Keying). Two modulation indexes are used, 10% and 100%. The LRIS64K 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 LRIS64K 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 105% a 95% 5% 60% Carrier Amplitude t t 2 t 1 t 3 t 4 Min (µs) t1 6,0 t2 2,1 t3 0 Max (µs) 9,44 t1 4,5 t4 0 0,8 b The clock recovery shall be operational after t4 max. ai15793 |
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