Datasheet

Electrical characteristics STM32F446xC/E
110/202 DocID027107 Rev 6
6.3.12 PLL spread spectrum clock generation (SSCG) characteristics
The spread spectrum clock generation (SSCG) feature allows to reduce electromagnetic
interferences (see
Table 52: EMI characteristics). It is available only on the main PLL.
I
DD(PLLI2S)
(4)
PLLI2S power consumption on
V
DD
VCO freq = 100 MHz
VCO freq = 432 MHz
0.15
0.45
-
0.40
0.75
mA
I
DDA(PLLI2S)
(4)
PLLI2S power consumption on
V
DDA
VCO freq = 100 MHz
VCO freq = 432 MHz
0.30
0.55
-
0.40
0.85
mA
1. Take care of using the appropriate division factor M to have the specified PLL input clock values.
2. Guaranteed by design.
3. Value given with main PLL running.
4. Guaranteed based on test during characterization.
Table 44. PLLI2S (audio PLL) characteristics (continued)
Symbol Parameter Conditions Min Typ Max Unit
Table 45. PLLISAI characteristics
Symbol Parameter Conditions Min Typ Max Unit
f
PLLSAI_IN
PLLSAI input clock
(1)
-0.95
(2)
12.10MHz
f
PLLSAI_OUT
PLLSAI multiplier output clock - - - 216 MHz
f
VCO_OUT
PLLSAI VCO output - 100 - 432 MHz
t
LOCK
PLLSAI lock time
VCO freq = 100 MHz 75 - 200
µs
VCO freq = 432 MHz 100 - 300
Jitter
(3)
Main SAI clock jitter
Cycle to cycle at
12.288 MHz on
48KHz period,
N=432, R=5
RMS - 90 - -
peak
to
peak
- ±280 - ps
Average frequency of
12.288 MHz
N = 432, R = 5
on 1000 samples
-90 -ps
FS clock jitter
Cycle to cycle at 48 KHz
on 1000 samples
-400 - ps
I
DD(PLLSAI)
(4)
PLLSAI power consumption on
V
DD
VCO freq = 100 MHz
VCO freq = 432 MHz
0.15
0.45
-
0.40
0.75
mA
I
DDA(PLLSAI)
(4)
PLLSAI power consumption on
V
DDA
VCO freq = 100 MHz
VCO freq = 432 MHz
0.30
0.55
-
0.40
0.85
mA
1. Take care of using the appropriate division factor M to have the specified PLL input clock values.
2. Guaranteed by design.
3. Value given with main PLL running.
4. Guaranteed based on test during characterization.
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