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参数资料
| 型号： | MAC7121MAG50XX |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | MICROCONTROLLER, PQFP112 |
| 封装： | 20 X 20 MM, 1.40 MM HEIGHT, 0.65 MM PITCH, ROHS COMPLIANT, MS-026BFA, LQFP-112 |
| 文件页数： | 8/56页 |
| 文件大小： | 757K |
| 代理商： | MAC7121MAG50XX |
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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
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
=
()
;
≈
=
Because
of
an
order
from
the
United
States
International
Trade
Commission,
BGA-packaged
product
lines
and
part
numbers
indicated
here
currently
are
not
available
from
Freescale
for
import
or
sale
in
the
United
States
prior
to
September
2010:MAC7131
products
in
208
MAPBGA
packages
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAC7121MFU | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:MAC7100 Microcontroller Family Hardware Specifications |
| MAC7121MFU50 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Microcontroller Family Hardware Specifications |
| MAC7121MPV | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:MAC7100 Microcontroller Family Hardware Specifications |
| MAC7121MPV50 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MAC7121MVF | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:MAC7100 Microcontroller Family Hardware Specifications |
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