參數(shù)資料
型號： ZL50022
廠商： Zarlink Semiconductor Inc.
英文描述： Enhanced 4 K Digital Switch with Stratum 4E DPLL
中文描述： 增強(qiáng)為4 K數(shù)字交換與地層4E條數(shù)字鎖相環(huán)
文件頁數(shù)： 90/121頁
文件大?。?/td> 939K
代理商： ZL50022
ZL50022
Data Sheet
90
Zarlink Semiconductor Inc.
25.0 Applications
This section contains application-specific details for clock and crystal operation and power supply decoupling.
25.1 OSCi Master Clock Requirement
The device requires a 20 MHz master clock source at the OSCi pin when operating in Master mode or in Divided
Slave with OSC mode. The clock source may be either an external clock oscillator connected to the OSCi pin, or an
external crystal connected between the OSCi and OSCo pins. If an external clock source is present, OSC_EN must
be tied high.
Note that using a crystal is only suitable for wider tolerance applications (i.e.
±
100 ppm). For stratum 4E
applications a clock oscillator with a tolerance of
±
32 ppm should be used. See Application Note ZLAN-68 for a list
of Oscillators and Crystals that can be used with Zarlink PLL’s and Digital Switches with embedded PLL’s.
25.1.1 External Crystal Oscillator
When an external crystal oscillator is used, a complete oscillator circuit made up of a crystal, resistor and capacitors
is shown in Figure 23 on page 90. XC is a buffered version of the 20 MHz input clock connected to the internal
circuitry.
Figure 23 - Crystal Oscillator Circuit
The accuracy of a crystal oscillator circuit 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 trimmer capacitor shown in
Figure 23 on page 90 may be used to compensate for capacitive effects.
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
accuracy only affects the output clock accuracy in the freerun or the holdover mode. The crystal specification is as
follows:
Frequency
20 MHz
Tolerance
As required
Oscillation Mode
Fundamental
Resonance Mode
Parallel
OSCo
25 pF
1 Μ
25 pF
20 MHz
OSCi
XC
4K DX
相關(guān)PDF資料
PDF描述
ZL50022GAC Enhanced 4 K Digital Switch with Stratum 4E DPLL
ZL50022QCC Enhanced 4 K Digital Switch with Stratum 4E DPLL
ZL50023 Enhanced 4 K Digital Switch
ZL50023GAC Enhanced 4 K Digital Switch
ZL50023QCC Enhanced 4 K Digital Switch
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ZL50022_06 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Enhanced 4 K Digital Switch with Stratum 4E DPLL
ZL50022GAC 制造商:Microsemi Corporation 功能描述:4K WITH RATE CONVERSION AND S4 - Trays 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC TDM SWITCH 4K-CH ENH 256PBGA 制造商:Microsemi Corporation 功能描述:IC TDM SWITCH 4K-CH ENH 256PBGA
ZL50022GAG2 制造商:Microsemi Corporation 功能描述:SWIT FABRIC 4K X 4K 1.8V/3.3V 256BGA - Trays 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC TDM SWITCH 4K-CH ENH 256PBGA 制造商:Microsemi Corporation 功能描述:IC TDM SWITCH 4K-CH ENH 256PBGA
ZL50022QCC 制造商:Microsemi Corporation 功能描述: 制造商:Microsemi Corporation 功能描述:4K WITH RATE CONVERSION AND S4E DPLL - Trays
ZL50022QCG1 制造商:Microsemi Corporation 功能描述:PB FREE 4K +RATE CONVERSION & 256L LQFP - Trays 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC TDM SWITCH 4K-CH ENH 256LQFP 制造商:Microsemi Corporation 功能描述:IC TDM SWITCH 4K-CH ENH 256LQFP
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