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S1D2512X01-A0B0 Datasheet(PDF) 27 Page - Samsung semiconductor |
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S1D2512X01-A0B0 Datasheet(HTML) 27 Page - Samsung semiconductor |
27 / 36 page ![]() DEFLECTION PROCESSOR FOR MULTISYNC MONITORS S1D2512X01 26 The control voltage of the VCO is typically comprised between 1.33V and 6V (see figure 6). The theoretical frequency range of this VCO is in the ratio 1 to 4.5, the effective frequency range has to be smaller 1 to 4.2 due to clamp intervention on filter lowest value. To avoid spread of external components and the circuit itself, it is possible to adjust free running frequency through I2C. This adjustment can be made automatically on the manufacturing line without manual operation by using lock/unlock information. The adjustment range is 0.8 to 1.3 F0 (where 1.3 F0 is the free running frequency at power on reset). The sync frequency has to be always higher than the free running frequency. As an example for a Synchro range from 24kHz to 100kHz, the suggested free running frequency is 23kHz. Another feature is the capability for MCU to force horizontal frequency through I2C to 2xF0 or 3xF0 (for burn in mode or safety requirement). In this case, inhibition switch is opened leaving PLL1 free but voltage on PLL1 filter is forced to 2.66V for 2xF0 or 4.0V for 3xF0. The PLL1 ensures the coincidence between the leading edge of the Synchro signal and a phase reference obtained by comparison between the sawtooth of the VCO and an internal DC voltage I2C adjustable between 2.8V and 4.0V (corresponding to ±10%) (see Figure 7) Figure 6. Details of VCO Figure 7. PLL1 Timing Diagram 7 6 a 4 IO 2 IO + - + - 6.4V + - RS Flip Flop 5 Loop Filter (0.80<a<1.30) I2C Free running ID (1.3V < V7 < 6V) R0 1.6V 6.4V 1.6V 0.875TH 0 TH Adjustment Co H osc Sawtooth 7/8TH 1/8TH 6.4V 2.8V < Vb < 4.0V Vb 1.6V Phase REF1 H Synchro Phase REF1 is obtained by compari- son between the sawtooth and a DC voltage adjustable between 2.8V and 4.0V. The PLL1 ensures the exact coincidence between the signals phase REF and Hsyns. A ±T H/10 phase adjustment is possible |
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