參數(shù)資料
型號: MAC7121MAG40
廠商: Freescale Semiconductor
文件頁數(shù): 8/56頁
文件大?。?/td> 0K
描述: IC MCU 32BIT FLASH 112-LQFP
標(biāo)準(zhǔn)包裝: 60
系列: MAC7xxx
核心處理器: ARM7
芯體尺寸: 32-位
速度: 40MHz
連通性: CAN,I²C,SCI,SPI
外圍設(shè)備: DMA,POR
輸入/輸出數(shù): 85
程序存儲器容量: 544KB(544K x 8)
程序存儲器類型: 閃存
RAM 容量: 32K x 8
電壓 - 電源 (Vcc/Vdd): 2.35 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 16x8/10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 125°C
封裝/外殼: 112-LQFP
包裝: 托盤
MAC7100 Microcontroller Family Hardware Specifications, Rev. 1.2
Preliminary
Electrical Characteristics
Freescale Semiconductor
16
3.8.2
PLL Filter Characteristics
The oscillator provides the reference clock for the PLL as shown in Figure 3. The voltage controlled
oscillator (VCO) of the PLL is also the system clock source in self clock mode. In order to operate reliably,
care must be taken to select proper values for external loop filter components.
Figure 3. Basic PLL Functional Diagram
The procedure described below can be used to calculate the resistance and capacitance values using typical
values for K1, f1 and ich from Table 20. First, the VCO Gain at the desired VCO output frequency is
approximated by:
Eqn. 8
The phase detector relationship is given by:
Eqn. 9
ich is the current in tracking mode. The loop bandwidth fC should be chosen to fulfill the Gardner’s stability
criteria by at least a factor of 10, a typical value for the stability factor is 50.
ζ = 0.9 ensures a good transient
response.
Eqn. 10
And finally the frequency relationship is defined as:
Eqn. 11
With the above inputs the resistance can be calculated as:
Eqn. 12
The capacitance CS can now be calculated as:
Eqn. 13
Phase
Detector
1
REFDV+1
K
φ
fREF
VDDPLL
R
CP
CS
KV
Loop Divider
1
SYNR+1
fVCO
fOSC
1
2
fCMP
VCO
Δ
K
V
K
1
e
f1 fVCO
()
K
1
1V
--------------------------
=
KΦ
i
ch
K
V
=
fC
2
ζ f
REF
πζ
1
ζ
2
+
()
----------------------------------------
1
10
------
fC
fREF
410
--------------
ζ
0.9
=
()
;
<
<
n
fVCO
fREF
----------
2
SYNR
1
+
()
==
R
2
π n f
C
KΦ
----------------------------
=
C
S
2
ζ
2
π f
C
R
---------------------
0.516
fC R
-------------
ζ
0.9
=
()
;
=
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