參數(shù)資料
型號(hào)： MAC7142VAF50XX
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： MICROCONTROLLER, PQFP100
封裝： 14 X 14 MM, 1.40 MM HEIGHT, 0.50 MM PITCH, ROHS COMPLIANT, LQFP-100
文件頁(yè)數(shù)： 8/56頁(yè)
文件大?。?/td> 757K
代理商： MAC7142VAF50XX
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
=
()
;
≈
=
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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