Datasheet

DocID022152 Rev 8 107/202
STM32F405xx, STM32F407xx Electrical characteristics
With a modulation depth (md) = ±2 % (4 % peak to peak), and PLLN = 240 (in MHz):
INCSTEP round 2
15
1–()2240××()100 5× 250×()⁄[]126md(quantitazed)%==
An amplitude quantization error may be generate
d 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:
md
quantized
% MODEPER INCSTEP× 100× 5×()2
15
1–()PLLN×()⁄=
As a result:
md
quantized
% 250 126× 100× 5×()2
15
1–()240×()⁄ 2.002%(peak)==
Figure 35 and Figure 36 show the main PLL output clock waveforms in center spread and
down spread modes, where:
F0 is f
PLL_OUT
nominal.
T
mode
is the modulation period.
md is the modulation depth.
Figure 35. PLL output clock waveforms in center spread mode
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TMODE XTMODE
MD
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MD
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