參數(shù)資料
型號(hào)： MT9045AN
廠商： ZARLINK SEMICONDUCTOR INC
元件分類(lèi)： 通信及網(wǎng)絡(luò)
英文描述： T1/E1/OC3 System Synchronizer
中文描述： SPECIALTY TELECOM CIRCUIT, PDSO48
封裝： 0.300 INCH, MO-118AA, SSOP-48
文件頁(yè)數(shù)： 17/34頁(yè)
文件大?。?/td> 495K
代理商： MT9045AN
MT9045
Data Sheet
17
Zarlink Semiconductor Inc.
Figure 8 - Clock Oscillator Circuit
For applications requiring
±
32ppm clock accuracy, the following clock oscillator module may be used.
FOX F7C-2E3-20.0MHz
Frequency: 20MHz
Tolerance: 25ppm 0C to 70C
Rise & Fall Time:10ns (0.33V 2.97V 15pF)
Duty Cycle: 40% to 60%
The output clock should be connected directly (not AC coupled) to the OSCi input of the MT9045, 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.
+3.3V
20MHz OUT
GND
0.1uF
+3.3V
OSCo
MT9045
OSCi
No Connection
OSCo
56pF
1M
39pF
3-50pF
20MHz
MT9045
OSCi
100
1uH
1uH inductor: may improve stability and is optional
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MT9045AN1 制造商:Microsemi Corporation 功能描述:FRAMER E1/OC3/T1 3.3V 48SSOP - Rail/Tube 制造商:Microsemi Corporation 功能描述:T1/E1/OC3 SYSTEM SYNCHRONIZER
MT9045ANR1 制造商:Microsemi Corporation 功能描述:FRAMER E1/OC3/T1 3.3V 48SSOP - Tape and Reel 制造商:Microsemi Corporation 功能描述:iB FREE T1/E1/OC3 SYSTEM SYNCHRONIZER 制造商:Zarlink Semiconductor Inc 功能描述:FRAMER E1/OC3/T1 3.3V 48SSOP - Tape and Reel
MT9046 制造商:ZARLINK 制造商全稱(chēng):Zarlink Semiconductor Inc 功能描述:SONET/SDH Clock Multiplier PLL
MT9046AN 制造商:Microsemi Corporation 功能描述:
MT9046AN1 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
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