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PEB2091NV5.3 参数 Datasheet PDF下载

PEB2091NV5.3图片预览
型号: PEB2091NV5.3
PDF下载: 下载PDF文件 查看货源
内容描述: 集成电路通信( ISDN Echocancellation电路) [ICs for Communications(ISDN Echocancellation Circuit)]
分类和应用: 电信集成电路综合业务数字网通信
文件页数/大小: 299 页 / 1531 K
品牌: INFINEON [ Infineon ]
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PEB 2091  
PEF 2091  
Functional Description  
The dynamic characteristics of this clock are described in "LT Modes", page 281.  
Clock CLS  
This clock is not defined in this mode.  
3.7.2  
NT and TE Mode  
U
U
XIN XOUT  
XIN XOUT  
CLS=7680 kHz  
FSC=8 kHz  
DCL=512 kHz  
CLS=7680 kHz  
FSC=8 kHz  
DCL=1536 kHz  
Interface  
Interface  
NT  
TE  
Synchr.  
(Downstream)  
Synchr.  
(Downstream)  
Figure 33  
Clock in NT Mode  
Figure 33  
Clocks in TE Mode  
In NT and TE modes the IEC-Q recovers the timing directly from the U-interface.  
Synchronization to the U-interface is achieved by including correction steps in the divider  
of the 15.36-MHz base clock. Thus the issued IOM®-2 clock signals are synchronous to  
the PTT-master clock on LT side.  
XIN/XOUT  
A free running crystal or other clock source should provide a 15.36-MHz base clock (see  
also “External Circuitry” on page 249 for more informations about crystal properties).  
CLS Clock  
In these modes the IEC-Q issues a 7.68-MHz clock signal. This clock signal is  
synchronous to the received U-interface signal. In order to achieve synchronism the free  
running 15.36-MHz master clock is not permanently divided by 2. Adjustment steps are  
included by division with 1 or 3. It is not available in power down.  
Semiconductor Group  
85  
Data Sheet 01.99