參數(shù)資料
型號(hào)： MT9040
廠商： Mitel Networks Corporation
英文描述： T1/E1 Synchronizer(T1/E1 系統(tǒng)同步裝置（由一個(gè)數(shù)字鎖相環(huán)組成）)
中文描述： 的T1/E1同步（T1/E1的系統(tǒng)同步裝置（由一個(gè)數(shù)字鎖相環(huán)組成））
文件頁(yè)數(shù)： 8/20頁(yè)
文件大小： 82K
代理商： MT9040
MT9040
Advance Information
8
Applications
This section contains MT9040 application specific
details
for
clock
and
operation, power supply decoupling, and control
operation.
crystal
operation,
reset
Master Clock
The MT9040 can use either a clock or crystal as the
master timing source.
In Freerun Mode, the frequency tolerance at the
clock outputs is identical to the frequency tolerance
of the source at the OSCi pin. For applications not
requiring an accurate Freerun Mode, tolerance of the
master
timing
source
may
applications requiring an accurate Freerun Mode,
such as AT&T TR62411, the tolerance of the master
timing source must be no greater than
±
32ppm.
be
±
100ppm.
For
Another consideration in determining the accuracy of
the master timing source is the desired capture
range. The sum of the accuracy of the master timing
source and the capture range of the MT9040 will
always equal 230ppm. For example, if the master
timing source is 100ppm, then the capture range will
be 130ppm.
Clock Oscillator
- when selecting a Clock Oscillator,
numerous parameters must be considered. This
includes absolute frequency, frequency change over
temperature, output rise and fall times, output levels
and duty cycle.
Figure 5 - Clock Oscillator Circuit
For applications requiring
±
32ppm clock accuracy,
the following clock oscillator module may be used.
FOX F7C-2E3-20.0MHz
Frequency:
Tolerance:
Rise & Fall Time:
Duty Cycle:
20MHz
25ppm 0C to 70C
10ns (0.33V 2.97V 15pF)
40% to 60%
CTS CB3LV-5I-20.0 MHz
Frequency:
Tolerance:
Rise & Fall Time:
Duty Cycle:
20MHz
25ppm
10ns
45% to 55%
The output clock should be connected directly (not
AC coupled) to the OSCi input of the MT9040, and
the OSCo output should be left open as shown in
Figure 8.
Crystal
Oscillator may be used. A complete oscillator circuit
made up of a crystal, resistor and capacitors is
shown in Figure 6.
Oscillator
-
Alternatively,
a
Crystal
Figure 6 - Crystal Oscillator Circuit
The accuracy of a crystal oscillator depends on the
crystal tolerance as well as the load capacitance
tolerance. Typically, for a 20MHz crystal specified
with a 32pF load capacitance, each 1pF change in
load capacitance contributes approximately 9ppm to
the frequency deviation. Consequently, capacitor
tolerances, and stray capacitances have a major
effect on the accuracy of the oscillator frequency.
The trimmer capacitor shown in Figure 6 may be
used
to
compensate
for
accuracy is not a concern, then the trimmer may be
removed, the 39pF capacitor may be increased to
56pF,
and
a
wider
tolerance
substituted.
capacitive
effects.
If
crystal
may
be
+3.3V
20MHz OUT
GND
0.1uF
+3.3V
OSCo
MT9040
OSCi
No Connection
OSCo
56pF
1M
39pF
3-50pF
20MHz
MT9040
OSCi
100
1uH
1uH inductor: may improve stability and is optional
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