參數(shù)資料
型號(hào)： MAC7141CFU50
廠商： MOTOROLA INC
元件分類(lèi)： 微控制器/微處理器
英文描述： 32-BIT, FLASH, 50 MHz, RISC MICROCONTROLLER, PQFP100
封裝： 14 X 14 MM, LQFP-100
文件頁(yè)數(shù)： 8/48頁(yè)
文件大?。?/td> 1282K
代理商： MAC7141CFU50
16
MAC7100 Microcontroller Family Hardware Specifications
MOTOROLA
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
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 fcmp, the deviation
from the reference clock fref 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 tNOM 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
tMIN1
12
3
N–1
N
tNOM
tMAX1
tMIN(N)
tMAX(N)
JN
()
max 1
tMAX N
()
NtNOM
---------------------
–1
tMIN N
()
NtNOM
---------------------
–
,
=
JN
()
j1
N
-------- j2
+
=
01
5
10
20
15
N
J(N)
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