MAC7200 datasheet(950/976 Pages) FREESCALE

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PLL Characteristics

MAC7200 Microcontroller Family Reference Manual, Rev. 2

872

Freescale Semiconductor

Using fREF = 4 Mhz and fVCO = 64Mhz, fC must be smaller than 100 kHz. A value of fC = 20 kHz is

chosen.

SYNR is calculated to be 7.

A standard value of R=3.3k

Ω is chosen.

A value of Cδ = 8.2 nF is chosen.

A.9.2

PLL Characteristics

Table A-15. PLL Characteristics

Num C

Rating

Symbol

Min

Typ

Max

Unit

D PLL reference frequency, crystal oscillator range (ALC

Mode)1

1. Min value only applies when the PLL is bypassed. When the PLL is enabled, the PLL frequency range specification is in effect.

fREF

0.5

—

(MAC72x2)

MHz

0.5

—

(MAC72x1)

D PLL reference frequency (External Clock Mode)1

fREF

0.5

—

MHz

P Self Clock Mode Frequency

fSCM

12.5

MHz

D PLL frequency range

fPLL

—

MHz

D VCO frequency range

fVCO

—

MHz

D Lock Detector transition from Acquisition to Tracking mode

|Δ

trk|

3—

2. Percentage deviation from target frequency

D Lock Detection

|Δ

Lock|

0—

1.5

% 2

D Un-Lock Detection

|Δ

unl|

0.5

—

2.5

% 2

D Lock Detector transition from Tracking to Acquisition mode

|Δ

unt|

6—

% 2

I10

C Charge pump current acquisition mode

| i

ch |

—50

—

μA

I11

C Charge pump current tracking mode

| i

ch |

—5

—

μA

2 3.14 20 20kHz

⋅⋅

⋅

700

----------------------------------------------------

3.59k

0.516

20 10

⋅

() 3.3 10

⋅⋅

----------------------------------------------------

7.82nF

≈

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