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STM32F405 Datasheet(PDF) 107 Page - STMicroelectronics

Part # STM32F405
Description  Arm® Cortex®-M4 32b MCUFPU, 210DMIPS, up to 1MB Flash/1924KB RAM, USB OTG HS/FS, Ethernet, 17 TIMs, 3 ADCs, 15 comm. interfaces & camera
PDF  204 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM32F405 Datasheet(HTML) 107 Page - STMicroelectronics

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DS8626 Rev 9
107/203
STM32F405xx, STM32F407xx
Electrical characteristics
With a modulation depth (md) =
±2 % (4 % peak to peak), and PLLN = 240 (in MHz):
INCSTEP
round
2
15
1
–
() 2 240
×
×
() 100 5
×
250
×
()
⁄
[]
126md(quantitazed)%
==
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:
mdquantized%
MODEPER INCSTEP
×
100
×
5
×
()
2
15
1
–
() PLLN
×
()
⁄
=
As a result:
mdquantized%
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 fPLL_OUT nominal.
Tmode is the modulation period.
md is the modulation depth.
Figure 35. PLL output clock waveforms in center spread mode
Frequency (PLL_OUT)
Time
F0
tmode
2xtmode
md
ai17291
md



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