參數(shù)資料
型號: 9S12KT256DGV1
英文描述: MC9S12KT256 Device User Guide
中文描述: MC9S12KT256設(shè)備用戶指南
文件頁數(shù): 108/126頁
文件大?。?/td> 7307K
代理商: 9S12KT256DGV1
Device User Guide — 9S12KT256DGV1/D V01.09
108
Freescale Semiconductor
i
ch
is the current in tracking mode.
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.7.3.2 Jitter Information
NOTE:
This section is under construction
The basic functionality of the PLL is shown in
Figure A-3
. 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 A-4
.
K
Φ
i
ch
K
V
=
=
316.7Hz/
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
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