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TS613 Scheda tecnica(PDF) 8 Page - STMicroelectronics |
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TS613 Scheda tecnica(HTML) 8 Page - STMicroelectronics |
8 / 9 page 8/9 TA0313 STMicroelectronics Solutions for ADSL Line Interfaces A good impedance matching assumes: Equation 5 From Equation 3 and Equation 5 we derive: Equation 6 By fixing an arbitrary value for R2 in Equation 6, we arrive at: Finally, the values of R2 and R3 allow us to extract R1 from Equation 1 so that: Equation 7 with GL the required gain. Capabilities The table below shows the calculated components for different values of k for a differential load of 25 Ω. In all cases, R2=1000 Ω and the gain=16dB. The last column displays the maximum amplitude level on the line regarding the TS613 maximum output capabilities (18Vp-p diff.) and a 1:2 line transformer ratio. Measurement of power consumption in application Conditions: l Passive impedance matching l Transformer turns ratio: 2 l Maximum level required on the line: 12.4Vpp l Maximum output level of the driver: 12.4Vpp GL (gain for the loaded system) GL is fixed for the application requirements GL=Vo/Vi=0.5(1+2R2/R1+R2/R3)/(1-R2/R3) R1 2R2/[2(1-R2/R3)GL-1-R2/R3] R2 (=R4) Arbitrarily fixed R3 (=R5) R2/(1-Rs/0.5RL) Rs 0.5RL(k-1) Active matching k R1 ( Ω) R3 ( Ω) Rs ( Ω) TS613 Output Level to get 12.4Vpp on the line with a turn ratio of 2. (Vp-p diff) Maximum Line Level (Vp-p diff) 1.3 953 1400 3.75 (3.9//100) 8.06 27.5 1.4 590 1620 5 (10//10) 8.68 25.7 1.5 422 2000 6.36 (6.8//100) 9.35 25.3 1.6 316 2490 7.57 (8.2//100) 9.95 23.7 1.7 261 3300 8.71 (10//68) 10.52 22.3 Passive matching 12.4 18 Ro 1 2 --- RL = R2 R3 ------- 1 2Rs RL ----------- – = R3 R2 1 2Rs RL ----------- – -------------------- = R 1 2R2 21 R2 R3 ------- – G L 1 – R2 R3 ------- – -------------------------------------------------------- = |
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