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PEB2086N 参数 Datasheet PDF下载

PEB2086N图片预览
型号: PEB2086N
PDF下载: 下载PDF文件 查看货源
内容描述: ISDN SubscribernAccess控制器 [ISDN SubscribernAccess Controller]
分类和应用: 数字传输接口电信集成电路电信电路综合业务数字网控制器
文件页数/大小: 320 页 / 1450 K
品牌: INFINEON [ Infineon ]
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Functional Description  
Protection Circuit for Unsymmetrical Receivers (PEB 2085)  
For unsymmetrical S0-receivers (PEB 2085) a 2.5 V reference voltage is supplied at pin SR1  
(output). The input signal at pin SR2 is referred to the level at pin SR1. In order to stabilize the  
reference voltage, a 10 nF capacitor is used. Resistors between pin SR 1 and the transformer  
should be avoided. Sometimes, however, a small resistor is required to improve the  
Longitudinal Conversion Loss (LCL) performance; absolute maximum is 200 .  
At pin SR2 a low-pass filter of 1st or 2nd order may be provided to reject high frequency noise.  
The overall impedace, however, should not exceed 10 kto avoid input signal reduction due  
to voltage division in conjunction with the internal impedance. In case no low-pass filter is  
required the resistor may be omitted.  
< 10 kΩ  
SR2  
47 pF  
GND  
1.8 V  
VDD  
S0 Bus  
SR1  
10 nF  
2.2 kΩ  
1.5 nF  
ITS05642  
Figure 48  
External Circuitry for Unsymmetrical Receivers (PEB 2086)  
The recommended protection circuit of figure 48 is widely identical to that of the transmitter  
(figure 47). This is necessary because no current limiting resistor of the desired dimension  
may be introduced in the SR1 path.  
The RC combination on the line side centre tap of the transformer compensates the LCL drop  
in the frequency range between 200 kHz and 300 kHz. This drop is a consequence of the  
10 nF capacitor at SR1 (which cannot be omitted). The resistor in this RC combination limits  
the current through the capacitor when overvoltages are applied. This normally allows using a  
capacitor rated at 400 V.  
The resonance frequency of the RC combination must be matched to suite specific  
compensation requirements.  
Semiconductor Group  
87