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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32F756VG датащи(PDF) 133 Page - STMicroelectronics |
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STM32F756VG датащи(HTML) 133 Page - STMicroelectronics |
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133 / 228 page  DocID027589 Rev 4 133/228 STM32F756xx Electrical characteristics 196 Equation 2 Equation 2 allows to calculate the increment step (INCSTEP): fVCO_OUT must be expressed in MHz. With a modulation depth (md) = ±2 % (4 % peak to peak), and PLLN = 240 (in MHz): An amplitude quantization error may be generated because the linear modulation profile is obtained by taking the quantized values (rounded to the nearest integer) of MODPER and INCSTEP. As a result, the achieved modulation depth is quantized. The percentage quantized modulation depth is given by the following formula: As a result: Figure 36 and Figure 37 show the main PLL output clock waveforms in center spread and down spread modes, where: F0 is fPLL_OUT nominal. Tmode is the modulation period. md is the modulation depth. Figure 36. PLL output clock waveforms in center spread mode INCSTEP round 2 15 1 – () md PLLN × × () 100 5 × MODEPER × () ⁄ [] = INCSTEP round 2 15 1 – () 2240 × × () 100 5 × 250 × () ⁄ [] 126md(quantitazed)% == mdquantized% MODEPER INCSTEP × 100 × 5 × () 2 15 1 – () PLLN × () ⁄ = mdquantized% 250 126 × 100 × 5 × () 2 15 1 – () 240 × () ⁄ 2.002%(peak) == |
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