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參數(shù)資料
| 型號： | MT90812 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | Integrated Digital Switch (IDX)(集成數(shù)字開關(guān)) |
| 中文描述： | 綜合數(shù)字交換機（IDX的）（集成數(shù)字開關(guān)） |
| 文件頁數(shù)： | 33/105頁 |
| 文件大?。?/td> | 334K |
| 代理商： | MT90812 |
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Advance Information
MT90812
29
9.5
C8P Pin Timing Source
The MT90812 can use either a clock or crystal, connecting to pins C8P_C16i and OSCo, as a reference timing
source.
9.5.1
Fig. 19 shows a 8.192MHz clock oscillator, with 32 ppm tolerance, directly connected to C8P_C16i pin of the
MT90812. The output clock should be connected directly (not AC coupled) to the C8P_C16i pin, and the OSCo
output should be left open.
Clock Oscillator
Figure 19 - Clock Oscillator Circuit
9.5.2
Alternatively, a Crystal Oscillator may be used. A complete oscillator circuit made up of a crystal, resistor and
capacitors is shown in Fig. 20.
Crystal Oscillator
The accuracy of a crystal oscillator depends on the crystal tolerance as well as the load capacitance tolerance.
Typically, for a 8.192MHz 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 Fig. 20 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. 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. CTS R1B23B32-8.192MHz
(20ppm absolute 6 ppm 0C to 50C, 32pF, 25
8.192MHz
As required
Fundamental
Parallel
20pF
35
1mW
+5V
8.192MHz
GND
0.1uF
+5V
C8P_C16i
No Connection
OSCo
MT90812
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MT90812AL | 制造商:Microsemi Corporation 功能描述:SWIT FABRIC 192 X 192 16.384MBPS 5V 64MQFP - Trays 制造商:Zarlink Semiconductor Inc 功能描述:SWIT FABRIC 192 X 192 16.384MBPS 5V 64MQFP - Trays |
| MT90812AL1 | 制造商:Microsemi Corporation 功能描述:SWIT FABRIC 192 X 192 16.384MBPS 5V 64MQFP - Trays 制造商:Microsemi Corporation 功能描述:PB FREE INTEGRATED DIGITAL SWITCH |
| MT90812AP | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Integrated Digital Switch (IDX) |
| MT90812AP1 | 制造商:Zarlink Semiconductor Inc 功能描述:SWIT FABRIC 192 X 192 16.384MBPS 5V 68PLCC /BAKE/DRYPACK - Rail/Tube 制造商:Zarlink Semiconductor Inc 功能描述:INTEGRATED DIGITAL SWCH |
| MT90812APR | 制造商:Microsemi Corporation 功能描述:SWIT FABRIC 192 X 192/64 X 64 1.048GBPS 5V 68PLCC - Tape and Reel |
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