參數(shù)資料
型號(hào)： TC1130
廠商： INFINEON TECHNOLOGIES AG
英文描述： 32-Bit Single-Chip Microcontroller
中文描述： 32位單片機(jī)
文件頁數(shù)： 86/113頁
文件大?。?/td> 1505K
代理商： TC1130
TC1130
Data Sheet
82
V0.3, 2003-09
This is especially important for bus cycles using waitstates and e.g. for the operation of
timers, serial interfaces, etc. For all slower operations and longer periods (e.g. pulse train
generation or measurement, lower baudrates, etc.) the deviation caused by the PLL jitter
is negligible.
The value of the accumulated PLL jitter depends on the number of consecutive VCO
output cycles within the respective timeframe. The VCO output clock is divided by the
output prescaler (K =
KDIV
+1) to generate the master clock signal
f
MC
. Therefore, the
number of VCO cycles can be represented as K
×
N
, where
N
is the number of
consecutive
f
MC
cycles (TCM).
For a period of
N
×
TCM the accumulated PLL jitter is defined by the corresponding
deviation D
N
:
D
N
[ns] =
±
(1.5 + 6.32
×
N
/
f
MC
);
f
MC
in [MHz],
N
= number of consecutive TCMs.
So, for a period of 3 TCMs @ 20 MHz and K = 12: D
3
=
±
(1.5 + 6.32
×
3
/
20) = 2.448 ns.
This formula is applicable for K
×
N
< 95. For longer periods the K
×
N
=95 value can be
used. This steady value can be approximated by: D
N
max
[ns] =
±
(1.5 + 600
/
(K
×
f
MC
)).
Figure 23
Approximated Accumulated PLL Jitter
Note: The bold lines indicate the minimum accumulated jitter which can be achieved by
selecting the maximum possible output prescaler factor K.
mcb04413_xc.vsd
Acc. jitter
D
N
ns
±8
±6
±4
±2
±1
0
5
10
20
25
N
1 MH
K=5
20MHz
40 MHz
±7
±5
±3
15
K=6
K=12
K=15
K=8
K=10
1
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