參數(shù)資料
型號(hào)： MT9043
廠商： Zarlink Semiconductor Inc.
英文描述： T1/E1 System Synchronizer
中文描述： T1/E1的系統(tǒng)同步
文件頁(yè)數(shù)： 14/29頁(yè)
文件大?。?/td> 453K
代理商： MT9043
MT9043
Data Sheet
14
Zarlink Semiconductor Inc.
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
- Alternatively, a Crystal Oscillator may be used. A complete oscillator circuit made up of a
crystal, resistor and capacitors is shown in Figure 9.
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 capacitive effects. If accuracy is not a
concern, then the trimmer may be removed, the 39pF capacitor may be increased to 56pF, and a wider tolerance
crystal may be 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.
Frequency:
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
)
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 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.
OSCo
56pF
1M
39pF
3-50pF
20MHz
MT9043
OSCi
100
1uH
1uH inductor: may improve stability and is optional
相關(guān)PDF資料
PDF描述
MT9043AN T1/E1 System Synchronizer
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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: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:Mitel Networks Corporation 功能描述:T1/E1/OC3 System Synchronizer
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