参数资料
型号: SC102204MFU
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 16-BIT, FLASH, 25 MHz, MICROCONTROLLER, PQFP80
封装: PLASTIC, LQFP-80
文件页数: 27/142页
文件大小: 6464K
代理商: SC102204MFU
Device User Guide — 9S12DT128DGV2/D V02.15
122
Freescale Semiconductor
Figure A-3 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 grey boxes show the calculation for fVCO = 50MHz and fref = 1MHz. E.g., these frequencies are used
for fOSC = 4MHz and a 25MHz bus clock.
The VCO Gain at the desired VCO frequency is approximated by:
The phase detector relationship is given by:
ich is the current in tracking mode.
The loop bandwidth fC should be chosen to fulfill the Gardner’s stability criteria by at least a factor of 10,
typical values are 50.
ζ = 0.9 ensures a good transient response.
fosc
1
refdv+1
fref
Phase
Detector
VCO
KV
1
synr+1
fvco
Loop Divider
KΦ
1
2
fcmp
Cs
R
Cp
VDDPLL
XFC Pin
K
V
K
1 e
f
1
f
vco
()
K
1
1V
-----------------------
=
100
e
60
50
()
100
------------------------
=
= -90.48MHz/V
KΦ
i
ch
K
V
=
= 316.7Hz/
f
C
2
ζ f
ref
πζ
1
ζ
2
+
------------------------------------------
1
10
------
f
C
f
ref
410
--------------
ζ 0.9
=
()
;
<
<
fC < 25kHz
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