参数资料
型号: MC9S12DG256CMFU
厂商: MOTOROLA 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: QFP-80
文件页数: 14/128页
文件大小: 2174K
代理商: MC9S12DG256CMFU
MC9S12DP256B Device User Guide — V02.13
110
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.
And finally the frequency relationship is defined as
With the above inputs the resistance can be calculated as:
The capacitance Cs can now be calculated as:
The capacitance Cp should be chosen in the range of:
The stabilization delays shown in Table A-16 are dependant on PLL operational settings and external
component selection (e.g. crystal, XFC filter).
A.5.3.2 Jitter Information
The basic functionality of the PLL is shown in Figure A-2. 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-3.
f
C
2
ζ f
ref
πζ
1
ζ
2
+
------------------------------------------
1
50
------
f
C
f
ref
450
--------------
ζ 0.9
=
(
)
;
<
<
n
f
VCO
f
ref
-------------
2
synr
1
+
()
==
R
2
π nf
C
KΦ
-----------------------------
=
C
s
2
ζ
2
π f
C R
----------------------
0.516
f
C R
---------------
ζ 0.9
=
()
;
=
C
s 20
C
p
C
s 10
≤≤
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相关代理商/技术参数
参数描述
MC9S12DG256CMPV 制造商:Rochester Electronics LLC 功能描述:- Bulk
MC9S12DG256CPV 制造商:Freescale Semiconductor 功能描述:
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MC9S12DG256CVPV 制造商:Rochester Electronics LLC 功能描述: 制造商:Freescale Semiconductor 功能描述:
MC9S12DG256MFUE 功能描述:16位微控制器 - MCU BARRACUDA4 MOS13 L01Y RoHS:否 制造商:Texas Instruments 核心:RISC 处理器系列:MSP430FR572x 数据总线宽度:16 bit 最大时钟频率:24 MHz 程序存储器大小:8 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:2 V to 3.6 V 工作温度范围:- 40 C to + 85 C 封装 / 箱体:VQFN-40 安装风格:SMD/SMT