參數(shù)資料
型號： 9S12DT256DGV3
廠商： Motorola, Inc.
英文描述： MC9S12DT256 Device User Guide V03.03
中文描述： MC9S12DT256設(shè)備的用戶手冊V03.03
文件頁數(shù)： 114/130頁
文件大?。?/td> 2077K
代理商： 9S12DT256DGV3
MC9S12DT256 Device User Guide — V03.03
112
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
C
K
Φ
The capacitance C
s
can now be calculated as:
The capacitance C
p
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 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,temperatureandotherfactorscauseslightvariationsinthecontrolloopresultinginaclock
jitter. This jitter affects the real minimum and maximum clock periods as illustrated in
Figure A-3
.
f
C
2
ζ
f
ref
------------------------------------------
π
ζ
1
ζ
2
+
+
1
10
------
f
C
f
C
< 25kHz
f
ref
4 10
-------------
ζ
0.9
=
(
)
;
<
→
<
n
f
VCO
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
相關(guān)PDF資料
PDF描述
9S12E128DGV1 MC9S12E-Family Device User Guide V01.04
9S12H128 16-bit Microcontroller
9S12H256 16-bit Microcontroller
9S12HN64 16-bit Microcontroller
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
9S12E128DGV1 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:MC9S12E-Family Device User Guide V01.04
9S12H128 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:16-bit Microcontroller
9S12H256 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:16-bit Microcontroller
9S12H256BDGV1 制造商:未知廠家 制造商全稱:未知廠家 功能描述:9S12H256B Device Guide
9S12HN64 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:16-bit Microcontroller
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