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TSP5070FNTR 参数 Datasheet PDF下载

TSP5070FNTR图片预览
型号: TSP5070FNTR
PDF下载: 下载PDF文件 查看货源
内容描述: 可编程编解码器/滤波器COMBO第二代 [PROGRAMMABLE CODEC/FILTER COMBO 2ND GENERATION]
分类和应用: 解码器编解码器LTE
文件页数/大小: 32 页 / 283 K
品牌: STMICROELECTRONICS [ ST ]
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TS5070 - TS5071  
formerand the impedanceof the 2Wloop,ZL. Ifthe  
impedance reflected back into the transformer pri-  
mary is expressed as ZL’ then the echo path trans-  
fer function from VFRO to VFXI is :  
Figure 1 shows a simplified diagram of the local  
echo path for a typical application with a trans-  
former interface. The magnitude and phase of the  
local echo signal, measured at VFXI, area function  
of the termination impedance ZT, the line trans-  
H(W) = ZL’ /(ZT + ZL’)  
(1)  
Figure 1: Simplified Diagram of Hybrid Balance Circuit  
PROGRAMMING THE FILTER  
Register2: select/de-select Hybal1 filter;  
set Hybal1 to Bi-Quad or 1st order;  
program pole and zero frequency.  
On initial power-up the Hybrid Balance filter is dis-  
abled. Before the hybrid balance filter can be pro-  
grammed it is necessary to design the transformer  
and terminationimpedancein orderto meetsystem  
2 W input return loss specifications,which are nor-  
mally measured against a fixed test impedance  
Table 10: Hybrid Balance Register 2 Byte 2 in-  
structions  
Bit Number  
Function  
(600or 900 inmost countries).Onlythencan the  
7
6
5
4
3
2
1
0
echo path be modeledand the hybridbalancefilter  
programmed. Hybrid balancing is also measured  
against a fixed test impedance, specified by each  
national Telecom administration to provide ade-  
quate control of talker and listener echo over the  
majority of their network connections.This test im-  
pedance is ZL in figure 1. The echo signal and the  
degree of transhybrid loss obtained by the pro-  
grammable filter must be measured from the PCM  
digital input DR0, to the PCM digital output DX0,  
either bydigitaltest signalanalysisorby conversion  
back to analog by a PCM CODEC/Filter.  
0
0
0
0
0
0
0
0
By Pass Hybal 1  
Filter  
X
X
X
X
X
X
X
X
Pole/zero Setting  
Register 3 : programpolefrequencyin Hybal2 filter;  
programzero frequencyin Hybal2 filter;  
settings = Please refer to software  
TS5077-2.  
Standard filter design techniques may be used to  
modelthe echo path (see equation(1)) and design  
a matchinghybridbalancefilterconfiguration.Alter-  
natively, the frequency response of the echo path  
can be measuredand the hybrid balance filter pro-  
grammed to replicate it.  
Three registers must be programmed in COMBO  
IIG to fully configure the Hybrid Balance Filter as  
follows :  
Register 1: select/de-select Hybrid Balance Filter;  
invert/non-invert cancellation signal;  
select/de-select Hybal2 filter section;  
attenuatorsetting.  
An Hybrid Balance filter design guide and soft-  
ware optimization program are available under li-  
cense from SGS-THOMSON Microelectronics (or-  
der TS5077-2).  
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