參數(shù)資料
型號: MC9S12C64CPB25
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 16-BIT, FLASH, 25 MHz, MICROCONTROLLER, PQFP52
封裝: LQFP-52
文件頁數(shù): 19/138頁
文件大?。?/td> 2318K
代理商: MC9S12C64CPB25
Device User Guide — 9S12C128DGV1/D V01.07
113
And finally the frequency relationship is defined as
With the above values the resistance can be calculated. The example is shown for a loop bandwidth
fC=10kHz:
The capacitance Cs can now be calculated as:
The capacitance Cp should be chosen in the range of:
B.6.3.2 Jitter Information
The basic functionality of the PLL is shown in Figure B-3. With each transition of the clock fcmp, the
deviation from the reference clock fref is measured and input voltage to the VCO is adjusted
accordingly.The adjustment is done continuously with no abrupt changes in the clock output frequency.
Noise, voltage, temperature and other factors cause slight variations in the control loop resulting in a clock
jitter. This jitter affects the real minimum and maximum clock periods as illustrated in Figure B-4.
n
f
VCO
f
ref
-------------
2
synr
1
+
()
==
= 50
R
2
π nf
C
KΦ
-----------------------------
=
=2*
π*50*10kHz/(316.7Hz/)=9.9k=~10k
C
s
2
ζ
2
π f
C R
----------------------
0.516
f
C R
---------------
ζ 0.9
=
()
;
=
= 5.19nF =~ 4.7nF
C
s 20
C
p
C
s 10
≤≤
Cp = 470pF
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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