參數(shù)資料
型號: MC9S12DT256BMPV
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 16-BIT, FLASH, 25 MHz, MICROCONTROLLER, PQFP112
封裝: LQFP-112
文件頁數(shù): 12/128頁
文件大?。?/td> 2174K
代理商: MC9S12DT256BMPV
MC9S12DP256B Device User Guide — V02.13
109
A.5.3 Phase Locked Loop
The oscillator provides the reference clock for the PLL. The PLLs Voltage Controlled Oscillator (VCO)
is also the system clock source in self clock mode.
A.5.3.1 XFC Component Selection
This section describes the selection of the XFC components to achieve a good filter characteristics.
Figure A-2 Basic PLL functional diagram
The following procedure can be used to calculate the resistance and capacitance values using typical
values for K1, f1 and ich from Table A-16.
The VCO Gain at the desired VCO output frequency is approximated by:
The phase detector relationship is given by:
ich is the current in tracking mode.
fosc
1
refdv+1
fref
Phase
Detector
VCO
KV
1
synr+1
fvco
Loop Divider
KΦ
1
2
fcmp
Cs
R
Cp
VDDPLL
K
V
K
1 e
f
1
f
vco
()
K
1
1V
-----------------------
=
KΦ
i
ch
K
V
=
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