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TS613 Folha de dados(PDF) 4 Page - STMicroelectronics

Nome de Peças TS613
Descrição Electrónicos  STMicroelectronics Solutions for ADSL Line Interfaces
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TS613 Folha de dados(HTML) 4 Page - STMicroelectronics

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TA0313
STMicroelectronics Solutions for ADSL Line Interfaces
The input provides two high-pass filters with a break frequency of about 1.6kHz which is necessary to
remove the DC component of the input signal. To avoid DC current flowing into the primary side of the
transformer, an output capacitor is used. The 1
µF capacitance provides a path for low frequencies, the
10nF capacitance provides a path for high end of the spectrum.
Filtering
As the hybrid circuit cannot perfectly separate the upstream signal and the downstream signal, any
distortion from the upstream signal could affect the downstream signal. For the upstream path, a low-
pass filter becomes absolutely necessary in order to cut off the higher frequencies from the DAC analog
output and the driver distortions. In this simple non-inverting amplification configuration, it is easy to
implement a Sallen-Key low-pass filter by using the TS613 or TS612.
A first solution is to use a LC cell before the driver to provide the low-pass filtering. Nevertheless, as
shown in Figure 6, using 2nd order active filtering is a good solution especially as regards cost and
space-saving considerations.
In the configuration shown in Figure 6, we assume R4=R6, R5=R7, C1=C3 and C2=C4.
Figure 5: Transmission path filtering
Figure 6: TS613 line driver with 2nd order active filtering
30 kH z
PO T S
U p stream
Dow n s t re a m
lo w pas s filter (trans m is s ion path)
D is tor tion
13 0kH z (o v e r P O T S )
27 6kH z (o v e r IS D N )
½R1
R3
R2
_
+
_
+
Vi
Vi
Vo
Vo
3
2
6
5
1
7
4
GND
8
+12V
25
GND
+12V
3k9
3k9
10µ
100n
100n
100n
1k
1k
12.5
10n
_
+
_
+
Vi
Vi
Vo
Vo
3
2
6
5
1
7
4
GND
8
+12V
25
GND
3k9
3k9
10µ
100n
100n
100n
1k
1k
10n
µ
½R1
12.5
R4
R5
C2
C4
R6
R7
C1
C3
½R1
R3
R2
_
+
_
+
Vi
Vi
Vo
Vo
3
2
6
5
1
7
4
GND
8
+12V
25
GND
+12V
3k9
3k9
10µ
100n
100n
100n
1k
1k
12.5
10n
_
+
_
+
Vi
Vi
Vo
Vo
3
2
6
5
1
7
4
GND
8
+12V
25
GND
3k9
3k9
10µ
100n
100n
100n
1k
1k
10n
µ
½R1
12.5
R4
R5
C2
C4
R6
R7
C1
C3


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