參數(shù)資料
型號: MC9S12E128
廠商: 飛思卡爾半導體(中國)有限公司
英文描述: 16 bit Microcontroller Unit (MCU)(16位MCU)
中文描述: 16位微控制器單元(MCU)(16位微控制器)
文件頁數(shù): 125/156頁
文件大小: 3077K
代理商: MC9S12E128
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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