MPC5643L datasheet(93/136 Pages) FREESCALE

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Electrical characteristics

MPC5643L Microcontroller Data Sheet, Rev. 8.1

Freescale Semiconductor

3.14

16 MHz RC oscillator electrical characteristics

3.15

ADC electrical characteristics

The device provides a 12-bit Successive Approximation Register (SAR) Analog-to-Digital Converter.

4 Self clocked mode frequency is the frequency that the FMPLL operates at when the reference frequency falls outside

the fLOR window.

5 f

VCO is the frequency at the output of the VCO; its range is 256–512 MHz.

fSCM is the self-clocked mode frequency (free running frequency); its range is 20–150 MHz.

fSYS =fVCOODF

6 This value is determined by the crystal manufacturer and board design. For 4 MHz to 20 MHz crystals specified for this

FMPLL, load capacitors should not exceed these limits.

7 This specification applies to the period required for the FMPLL to relock after changing the MFD frequency control bits

in the synthesizer control register (SYNCR).

8 This value is determined by the crystal manufacturer and board design.

9 Jitter is the average deviation from the programmed frequency measured over the specified interval at maximum f

SYS.

Measurements are made with the device powered by filtered supplies and clocked by a stable external clock signal.

Noise injected into the FMPLL circuitry via VDDPLL and VSSPLL and variation in crystal oscillator frequency increase the

CJITTER percentage for a given interval.

10 Proper PC board layout procedures must be followed to achieve specifications.

11 Values are with frequency modulation disabled. If frequency modulation is enabled, jitter is the sum of C

JITTER and

either fCS or fDS (depending on whether center spread or down spread modulation is enabled).

12 Modulation depth is attenuated from depth setting when operating at modulation frequencies above 50 kHz.

Table 24. RC oscillator electrical characteristics

Symbol

Parameter

Conditions

Minimum Typical Maximum Unit

fRC

RC oscillator frequency

—

15.04

16.96

MHz

MPC5643L 数据表(PDF) 93 Page - Freescale Semiconductor, Inc

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