參數(shù)資料
型號(hào)： MAC7100CPV
廠商： Motorola, Inc.
英文描述： MAC7100 Microcontroller Family Hardware Specifications
中文描述： MAC7100微控制器系列硬件規(guī)格
文件頁(yè)數(shù)： 16/48頁(yè)
文件大?。?/td> 1514K
代理商： MAC7100CPV
16
MAC7100 Microcontroller Family Hardware Specifications
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA
Electrical Characteristics
3.8.2.1
Jitter Information
The basic functionality of the PLL is shown in Figure 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 4. It is important to note that the pre-scaler used
by timers and serial modules will eliminate the effect of PLL jitter to a large extent.
Figure 4. Jitter Definitions
The relative deviation of t
NOM
is at its maximum for one clock period, and decreases towards zero for larger
number of clock periods (N). Thus, jitter is defined as:
For N
<
100, the following equation is a good fit for the maximum jitter:
Figure 5. Maximum Bus Clock Jitter Approximation
0
t
MIN1
t
NOM
t
MAX1
1
2
3
N–1
N
t
MIN
(N)
t
MAX
(N)
J N
max
1
t
N
N t
NOM
---------------------
–
1
t
N
N t
NOM
---------------------
–
,
=
J N
j
1
N
-------
j
2
+
=
0 1
5
10
20
15
N
J(N)
F
Freescale Semiconductor, Inc.
n
.
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