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STM32F722IC Datasheet(PDF) 141 Page - STMicroelectronics |
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STM32F722IC Datasheet(HTML) 141 Page - STMicroelectronics |
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141 / 229 page  DS11853 Rev 6 141/229 STM32F722xx STM32F723xx Electrical characteristics 201 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 43 and Figure 44 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 43. PLL output clock waveforms in center spread mode Figure 44. PLL output clock waveforms in down spread mode mdquantized% MODEPER INCSTEP × 100 × 5 × () 2 15 1 – () PLLN × () ⁄ = mdquantized% 250 126 × 100 × 5 × () 2 15 1 – () 240 × () ⁄ 2.002%(peak) == Frequency (PLL_OUT) Time F0 tmode 2xtmode md ai17291 md Frequency (PLL_OUT) Time F0 tmode 2xtmode 2xmd ai17292b |
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