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TS613 Datasheet(PDF) 5 Page - STMicroelectronics |
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TS613 Datasheet(HTML) 5 Page - STMicroelectronics |
5 / 9 page 5/9 STMicroelectronics Solutions for ADSL Line Interfaces TA0313 The resistances R1, R2 and R3 allow us to calculate the gain of the structure as follows: The damping factor can be derived from these resistances and the capacitances C1, C2, C3 and C4: with: The higher the gain, the more sensitive the damping factor is. When the gain is higher than 1 it is preferable to use very stable resistance and capacitance values. The value of the gain does not affect the cut-off frequency, fc, which is derived as follows: Moreover this expression shows that it is possible to shift the cut-off frequency by simply changing the values of the resistances R4, R5 or R6, R7 — with neither a change of capacitance nor of the damping factor. The following table shows a calculations of components for a cut-off frequency around 130kHz for the ADSL over POTS and 270kHz for the ADSL over ISDN. The final, accurate settings are made by compromising between the attenuation of the highest frequencies of the upstream signal and the impact of the distortion on the downstream signal. This is best done directly in the application. Nevertheless we can start with the following initial values: Transformation ratio In differential mode, the TS613 and TS612 are able to deliver a typical amplitude signal of 18V peak to peak. The dynamic line impedance is 100 Ω. The typical value of the amplitude signal required on the line is up to 12.4V peak to peak. By using a 1:2 transformer ratio the reflected impedance back to the primary will be a quarter (25 Ω) and therefore the amplitude of the signal required with this impedance will be halved (6.2 V peak to peak). Assuming a 25 Ω series resistance (12.5Ω for both outputs) is necessary for impedance matching, the output signal amplitude required is 12.4V peak to peak. This value is acceptable for both TS613 and TS612. In this case, the load impedance is 25 Ω for each driver in single ended. R1 ( Ω) R2 R3 ( Ω) R4 R6 ( Ω) R5 R7 ( Ω) C1 C3 (nF) C2 C4 (nF) Gain (dB) fc (kHz) ζ 180 536 261 261 10 2.2 16.8 130 0.73 180 536 127 127 10 2.2 16.8 270 0.73 Gain 1 2R2 R1 ----------- +1 2R 3 R 1 ----------- + == ζ 2 C1 αC2 – 2 C1C 2 ----------------------------- 2C 3 αC4 – 2 C3C 4 ----------------------------- == α 2R 2 R 1 ----------- 2R3 R1 ----------- == fc 1 2 π R4R5C1C2 -------------------------------------------- 1 2 π R6R7C3C4 -------------------------------------------- == |
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