參數(shù)資料
型號(hào): MC68HC08GP8AMFB
廠商: FREESCALE SEMICONDUCTOR INC
元件分類(lèi): 微控制器/微處理器
英文描述: 8-BIT, MROM, 8.2 MHz, MICROCONTROLLER, PQFP44
封裝: PLASTIC, QFP-44
文件頁(yè)數(shù): 92/126頁(yè)
文件大?。?/td> 4243K
代理商: MC68HC08GP8AMFB
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Clock Generator Module (CGM)
Data Sheet
MC68HC08GP8A
68
Clock Generator Module (CGM)
MOTOROLA
4.8.3 Choosing a Filter
As described in 4.8.2 Parametric Influences on Reaction Time, the external filter
network is critical to the stability and reaction time of the PLL. The PLL is also
dependent on reference frequency and supply voltage.
Figure 4-10 shows two types of filter circuits. In low-cost applications, where
stability and reaction time of the PLL are not critical, the three component filter
network of Figure 4-10 (B) can be replaced by a single capacitor, CF, shown in
Figure 4-10 (A). Refer to Table 4-4 for recommended filter components at various
reference frequencies. For reference frequencies between the values listed in the
table, extrapolate to the nearest common capacitor value. In general, a slightly
larger capacitor provides more stability at the expense of increased lock time.
Figure 4-10. PLL Filter
Table 4-4. Example Filter Component Values
fRCLK
CF1
CF2
RF1
CF
32 kHz
0.15
F
15 nF
2 K
0.22
F
40 kHz
0.12
F
12 nF
2 K
0.18
F
50 kHz
0.10
F
10 nF
2 K
0.18
F
60 kHz
82 nF
8.2 nF
2 K
0.12
F
70 kHz
68 nF
6.8 nF
2 K
0.12
F
80 kHz
56 nF
5.6 nF
2 K
0.1
F
90 kHz
56 nF
5.6 nF
2 K
0.1
F
100 kHz
47 nF
4.7 nF
2 K
82 nF
CGMXFC
RF1
CF2
CF1
VSSA
CGMXFC
CF
VSSA
(A)
(B)
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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