參數(shù)資料
型號(hào)： MT9043
廠(chǎng)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)： 12/24頁(yè)
文件大?。?/td> 100K
代理商： MT9043
MT9043
Advance Information
12
Rise & Fall Time:
Duty Cycle:
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 MT9043, 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 9.
Oscillator
-
Alternatively,
a
Crystal
Figure 9 - 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 9 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.
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.
capacitive
effects.
If
crystal
may
be
Frequency:
20MHz
Tolerance:
Oscillation Mode:
Resonance Mode:
Load Capacitance:
Maximum Series Resistance:
Approximate Drive Level:
e.g., R1B23B32-20.0MHz
(20ppm absolute,
±
6ppm 0C to 50C, 32pF, 25
)
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 10. 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 10 - Power-Up Reset Circuit
OSCo
56pF
1M
39pF
3-50pF
20MHz
MT9043
OSCi
100
1uH
1uH inductor: may improve stability and is optional
+3.3V
RST
R
P
1k
C
10nF
R
10k
MT9043
相關(guān)PDF資料
PDF描述
MT9044 T1/E1/OC3 System Synchronizer(T1/E1/OC3 系統(tǒng)同步裝置（由一個(gè)數(shù)字鎖相環(huán)組成）)
MT90500 Multi-Channel ATM AAL1 SAR(多通道 ATM AAL1分段及重組設(shè)備（基于通訊總線(xiàn)的系統(tǒng)與ATM網(wǎng)絡(luò)的接口）)
MT90500 Multi-Channel ATM AAL1 SAR
MT90500AL Multi-Channel ATM AAL1 SAR
MT90502 Multi-Channel AAL2 SAR(多通道 ATM AAL2分段及重組設(shè)備（基于通訊總線(xiàn)的系統(tǒng)與ATM網(wǎng)絡(luò)的接口）)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MT9043AN 制造商:Microsemi Corporation 功能描述:
MT9043AN1 制造商:Microsemi Corporation 功能描述:PB FREE T1/E1 SYSTEM SYNCHRONIZER 制造商:Microsemi Corporation 功能描述:FRAMER E1/T1 3.3V 48SSOP - Rail/Tube 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC SYNCHRONIZER T1/E1 48SSOP 制造商:Microsemi Corporation 功能描述:IC SYNCHRONIZER T1/E1 48SSOP
MT9043AN48PINSSOP 制造商:ZARLINK 制造商全稱(chēng):Zarlink Semiconductor Inc 功能描述:T1/E1 System Synchronizer
MT9043ANR1 制造商:Microsemi Corporation 功能描述:FRAMER E1 /T1 3.3V 48SSOP - Tape and Reel 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC SYNCHRONIZER T1/E1 48SSOP 制造商:Microsemi Corporation 功能描述:IC SYNCHRONIZER T1/E1 48SSOP
MT9044 制造商:MITEL 制造商全稱(chēng):Mitel Networks Corporation 功能描述:T1/E1/OC3 System Synchronizer
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