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參數(shù)資料
| 型號： | ZL30108 |
| 廠商： | Zarlink Semiconductor Inc. |
| 英文描述： | Network Interface DPLL |
| 中文描述： | 網(wǎng)絡(luò)接口數(shù)字鎖相環(huán) |
| 文件頁數(shù)： | 19/28頁 |
| 文件大小： | 531K |
| 代理商： | ZL30108 |
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ZL30108
Data Sheet
19
Zarlink Semiconductor Inc.
5.2.2 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 12.
The accuracy of a crystal oscillator depends on the crystal tolerance as well as the load capacitance tolerance.
Typically, for a 20 MHz crystal specified with a 32 pF load capacitance, each 1 pF change in load capacitance
contributes approximately 9 ppm to the frequency deviation. Consequently, capacitor tolerances and stray
capacitances have a major effect on the accuracy of the oscillator frequency.
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.
Figure 12 - Crystal Oscillator Circuit
1
Frequency
20 MHz
2
Tolerance
As required
3
Oscillation Mode
Fundamental
4
Resonance Mode
Parallel
5
Load Capacitance
As required
6
Maximum Series Resistance
50
Table 6 - Typical Crystal Oscillator Specification
OSCo
1 M
20 MHz
ZL30108
OSCi
100
1 μH
The 100
resistor and the 1 μH inductor may improve
stability and are optional.
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| ZL30109QDG | DS1/E1 System Synchronizer with 19.44 MHz Output |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ZL30108_06 | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:SONET/SDH Network Interface DPLL |
| ZL30108LDA | 制造商:Microsemi Corporation 功能描述:SONET/SDH NETWORK INTRFC DPLL 32QFN - Rail/Tube 制造商:Zarlink Semiconductor Inc 功能描述:SONET/SDH NETWORK INTRFC DPLL 32QFN - Rail/Tube |
| ZL30108LDE1 | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:SONET/SDH Network Interface DPLL |
| ZL30108LDG1 | 制造商:Microsemi Corporation 功能描述:PB FREE SONET/SDH NETWORK INTERFACE DPLL - Trays 制造商:Microsemi Corporation 功能描述:PBFREE SONET&SDH NETWORK I/F DPLL TRAY 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC DPLL SONET/SDH 32QFN 制造商:Microsemi Corporation 功能描述:IC DPLL SONET/SDH 32QFN |
| ZL30109 | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:DS1/E1 System Synchronizer with 19.44 MHz Output |
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