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TS613 Folha de dados(PDF) 4 Page - STMicroelectronics |
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TS613 Folha de dados(HTML) 4 Page - STMicroelectronics |
4 / 9 page 4/9 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 Ω 10n _ + _ + Vi Vi Vo Vo 3 2 6 5 1 7 4 GND 8 +12V 25 Ω GND 3k9 3k9 10µ 100n 100n 100n 1k 1k 10n µ ½R1 12.5 Ω 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 Ω 10n _ + _ + Vi Vi Vo Vo 3 2 6 5 1 7 4 GND 8 +12V 25 Ω GND 3k9 3k9 10µ 100n 100n 100n 1k 1k 10n µ ½R1 12.5 Ω R4 R5 C2 C4 R6 R7 C1 C3 |
Nº de peça semelhante - TS613 |
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Descrição semelhante - TS613 |
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