參數(shù)資料
型號： MC9S12A64CFUE
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, PQFP80
封裝： PLASTIC, QFP-80
文件頁數(shù)： 14/128頁
文件大?。?/td> 1835K
代理商： MC9S12A64CFUE
MC9S12DJ64 Device User Guide — V01.20
110
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.
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-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.
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
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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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC9S12A64CPVE 功能描述:16位微控制器 - MCU 64K FLASH HCS12 MCU RoHS:否 制造商:Texas Instruments 核心:RISC 處理器系列:MSP430FR572x 數(shù)據(jù)總線寬度:16 bit 最大時鐘頻率:24 MHz 程序存儲器大小:8 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:VQFN-40 安裝風格:SMD/SMT
MC9S12B128CFUE 功能描述:16位微控制器 - MCU 9S12B128 - STURGEON RoHS:否 制造商:Texas Instruments 核心:RISC 處理器系列:MSP430FR572x 數(shù)據(jù)總線寬度:16 bit 最大時鐘頻率:24 MHz 程序存儲器大小:8 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:VQFN-40 安裝風格:SMD/SMT
MC9S12B128CPVE 功能描述:16位微控制器 - MCU 9S12B128 - STURGEON RoHS:否 制造商:Texas Instruments 核心:RISC 處理器系列:MSP430FR572x 數(shù)據(jù)總線寬度:16 bit 最大時鐘頻率:24 MHz 程序存儲器大小:8 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:VQFN-40 安裝風格:SMD/SMT
MC9S12B128CPVER 功能描述:16位微控制器 - MCU 9S12B128 - STURGEON RoHS:否 制造商:Texas Instruments 核心:RISC 處理器系列:MSP430FR572x 數(shù)據(jù)總線寬度:16 bit 最大時鐘頻率:24 MHz 程序存儲器大小:8 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:VQFN-40 安裝風格:SMD/SMT
MC9S12B128MFU 制造商:Rochester Electronics LLC 功能描述: 制造商:Freescale Semiconductor 功能描述:
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