參數(shù)資料
型號(hào)： MT9041B
廠商： Mitel Networks Corporation
英文描述： T1/E1 System 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： T1/E1的系統(tǒng)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?。?/td> 87K
代理商： MT9041B
MT9041B
8
For applications requiring
±
32ppm clock accuracy,
the following clock oscillator module may be used.
CTS CXO-65-HG-5-C-20.0MHz
Frequency:
Tolerance:
Rise & Fall Time:
Duty Cycle:
20MHz
25ppm 0C to 70C
8ns (0.5V 4.5V 50pF)
45% to 55%
The output clock should be connected directly (not
AC coupled) to the OSCi input of the MT9041B, and
the OSCo output should be left open as shown in
Figure 5.
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
The crystal should be a fundamental mode type - not
an overtone. The fundamental mode crystal permits
a simpler oscillator circuit with no additional filter
components and is less likely to generate spurious
responses. The crystal specification is as follows.
Frequency:
Tolerance:
Oscillation Mode:
Resonance Mode:
Load Capacitance:
Maximum Series Resistance:
Approximate Drive Level:
e.g., CTS R1027-2BB-20.0MHZ
(
±
20ppm absolute,
±
6ppm 0C to 50C, 32pF, 25
)
20MHz
As required
Fundamental
Parallel
32pF
35
1mW
Reset Circuit
A simple power up reset circuit with about a 50us
reset low time is shown in Figure 7. Resistor R
P
is for
protection only and limits current into the RST pin
during power down conditions. The reset low time is
not critical but should be greater than 300ns.
Figure 7 - Power-Up Reset Circuit
Power Supply Decoupling
The MT9041B has two VDD (+5V) pins and two VSS
(GND) pins. Power and decoupling capacitors should
be included as shown in Figure 8.
Figure 8 - Power Supply Decoupling
OSCo
56pF
1M
39pF
3-50pF
20MHz
MT9041B
OSCi
100
1uH
1uH inductor: may improve stability and is optional
+5V
RST
R
P
1k
C
10nF
R
10k
MT9041B
C2
0.1uF
MT9041B
+
18
5
1
15
+
C1
0.1uF
相關(guān)PDF資料
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MT9041BP 制造商:Microsemi Corporation 功能描述: 制造商:Zarlink Semiconductor Inc 功能描述:PCM, OTHER/SPECIAL/MISCELLANEOUS, 28 Pin, Plastic, PLCC
MT9041BP1 制造商:Microsemi Corporation 功能描述:FRAMER E1 /T1 5V 28PLCC - Rail/Tube 制造商:Microsemi Corporation 功能描述:PB FREE MULTIPLE OUTPUT TRUNK PLL 制造商:Zarlink Semiconductor Inc 功能描述:FRAMER E1 /T1 5V 28PLCC - Rail/Tube 制造商:Zarlink Semiconductor Inc 功能描述:PB FREE MULTIPLE OUTPUT TRUNK PLL
MT9041BPR 制造商:Microsemi Corporation 功能描述:SPECIALTY TELECOM CIRCUIT, 28 Pin Plastic PLCC
MT9041BPR1 制造商:Microsemi Corporation 功能描述:FRAMER E1 /T1 5V 28PLCC - Tape and Reel 制造商:Zarlink Semiconductor Inc 功能描述:FRAMER E1 /T1 5V 28PLCC - Tape and Reel
MT9042 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Global Digital Trunk Synchronizer
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