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| 型号： | MAC7122CPV50 |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, FLASH, 50 MHz, MICROCONTROLLER, PQFP112 |
| 封装： | LQFP-112 |
| 文件页数： | 8/60页 |
| 文件大小： | 760K |
| 代理商： | MAC7122CPV50 |
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MAC7100 Microcontroller Family Hardware Specifications, Rev. 1.1.1
Preliminary
Electrical Characteristics
Freescale Semiconductor
16
Figure 3. Basic PLL Functional Diagram
The procedure described below can be used to calculate the resistance and capacitance values using typical
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
The capacitance CP should be chosen in the range of:
Eqn. 14
The stabilization delays shown in Table 20 are dependant on PLL operational settings and external
component selection (for example, the crystal and XFC filter).
Phase
Detector
1
REFDV+1
K
φ
fREF
VDDPLL
R
CP
CS
KV
Loop Divider
1
SYNR+1
fVCO
fOSC
1
2
fCMP
VCO
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
=
()
;
≈
=
C
S
20
÷
C
P
C
S
10
÷
≤≤
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAC7122CVF50 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Microcontroller Family Hardware Specifications |
| MAC7122CVM50 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Microcontroller Family Hardware Specifications |
| MAC7122MAF50 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Microcontroller Family Hardware Specifications |
| MAC7122MAG50 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Microcontroller Family Hardware Specifications |
| MAC7122MFU50 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Microcontroller Family Hardware Specifications |
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