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參數(shù)資料
| 型號： | ZL30108LDA |
| 廠商： | XILINX INC |
| 元件分類： | 數(shù)字傳輸電路 |
| 英文描述： | ATM/SONET/SDH SUPPORT CIRCUIT, QCC32 |
| 封裝： | 5 X 5 MM, MO-220, QFN-32 |
| 文件頁數(shù)： | 11/57頁 |
| 文件大?。?/td> | 691K |
| 代理商： | ZL30108LDA |
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ZL30108
Data Sheet
19
Zarlink Semiconductor Inc.
7.2.2
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 11.
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 11 - 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
Ω
Table 6 - Typical Crystal Oscillator Specification
OSCo
1 M
Ω
20 MHz
ZL30108
OSCi
100
Ω
1
μH
The 100
Ω resistor and the 1 H inductor may improve
stability and are optional.
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| ZL30108LDE1 | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:SONET/SDH Network Interface DPLL |
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| 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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| ZL30109QDG | 制造商:Microsemi Corporation 功能描述: |
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