STM32F427AI datasheet(125/240 Pages) STMICROELECTRONICS

125 / 240 page

DS9405 Rev 12

125/240

STM32F427xx STM32F429xx

Electrical characteristics

197

Jitter(3)

Cycle-to-cycle jitter

System clock

120 MHz

RMS

peak

-±150

Period Jitter

RMS

peak

-±200

Main clock output (MCO) for

RMII Ethernet

Cycle to cycle at 50 MHz

on 1000 samples

-32

Main clock output (MCO) for MII

Ethernet

Cycle to cycle at 25 MHz

on 1000 samples

-40

Bit Time CAN jitter

Cycle to cycle at 1 MHz

on 1000 samples

-330

IDD(PLL)(4)

PLL power consumption on VDD

VCO freq = 100 MHz

VCO freq = 432 MHz

0.15

0.45

0.40

0.75

IDDA(PLL)(4)

PLL power consumption on

VDDA

VCO freq = 100 MHz

VCO freq = 432 MHz

0.30

0.55

0.40

0.85

1. Use the appropriate division factor M to obtain the specified PLL input clock values. The M factor is shared between PLL

and PLLI2S.

2. Specified by design.

3. The use of 2 PLLs in parallel could degrade the Jitter up to +30%.

4. Evaluated by characterization.

Table 43. Main PLL characteristics (continued)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

Table 44. PLLI2S (audio PLL) characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fPLLI2S_IN

PLLI2S input clock(1)

-0.95(2)

12.10

MHz

fPLLI2S_OUT

PLLI2S multiplier output clock

216

MHz

fVCO_OUT

PLLI2S VCO output

100

432

MHz

tLOCK

PLLI2S lock time

VCO freq = 100 MHz

200

µs

VCO freq = 432 MHz

100

300

Jitter(3)

Master I2S clock jitter

Cycle to cycle at

12.288 MHz on

48KHz period,

N=432, R=5

RMS

peak

±280

Average frequency of

12.288 MHz

N = 432, R = 5

on 1000 samples

-90

WS I2S clock jitter

Cycle to cycle at 48 KHz

on 1000 samples

-400

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