參數(shù)資料
型號： MC9S12E64MPV
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： MC9S12E-Family Device User Guide V01.04
中文描述： 16-BIT, FLASH, 25 MHz, MICROCONTROLLER, PQFP112
封裝： LQFP-112
文件頁數(shù)： 125/156頁
文件大?。?/td> 3077K
代理商： MC9S12E64MPV
125
The loop bandwidth f
C
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
f
C
=10kHz:
2
π
n f
K
Φ
The capacitance C
s
can now be calculated as:
The capacitance C
p
should be chosen in the range of:
B.4.3.2 Jitter Information
The basic functionality of the PLL is shown in
Figure B-2
. With each transition of the clock f
cmp
, the
deviation from the reference clock f
ref
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-3
.
NOTE:
This section is under construction
The basic functionality of the PLL is shown in
Figure B-2
. With each transition of the clock f
cmp
, the
deviation from the reference clock f
ref
is measured and input voltage to the VCO is adjusted
f
C
2
ζ
f
------------------------------------------
π
ζ
1
ζ
2
+
+
1
10
------
f
C
f
C
< 25kHz
f
4 10
-------------
ζ
0.9
=
(
)
;
<
→
T
<
n
f
f
ref
-------------
2
synr
1
+
(
)
=
=
= 50
R
----------------------------
=
=
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
≤
≤
C
p
= 470pF
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC9S12E64MPVE 功能描述:16位微控制器 - MCU MORAY EEL 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(fēng)格:SMD/SMT
MC9S12G128MLF 制造商:Freescale Semiconductor 功能描述:16BIT 96K FLASH - Trays
MC9S12G128MLH 制造商:Freescale Semiconductor 功能描述:MC9S12G128MLH - Bulk
MC9S12G128MLL 制造商:Freescale Semiconductor 功能描述:MCU 16BIT 128K FLASH - Trays
MC9S12G192CLL 制造商:Freescale Semiconductor 功能描述:MC9S12G192CLL - Bulk
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