参数资料
型号: SC515846CFU
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: 28/142页
文件大小: 6464K
代理商: SC515846CFU
Device User Guide — 9S12DT128DGV2/D V02.15
123
Freescale Semiconductor
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:
A.5.3.2 Jitter Information
The basic functionality of the PLL is shown in Figure A-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 A-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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相关代理商/技术参数
参数描述
SC515846CPV 制造商:Freescale Semiconductor 功能描述:
SC515847 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:MC9S12DT128 Device User Guide V02.09
SC515848 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Device User Guide
SC515849 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:MC9S12DT128 Device User Guide V02.09
SC516/WH 制造商:CQR Security 功能描述:REED AND MAGNET HOUSING