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TS613ID データシート(PDF) 8 Page - STMicroelectronics |
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TS613ID データシート(HTML) 8 Page - STMicroelectronics |
8 / 10 page TS613 8/10 By identification of both equations (2) and (3), the synthesized impedance is, with Rs1=Rs2=Rs: Unlike the level Vo° required for a passive imped- ance, Vo° will be smaller than 2Vo in our case. Let us write Vo°=kVo with k the matching factor vary- ing between 1 and 2. Assuming that the current through R3 is negligeable, it comes the following resistance divider: After choosing the k factor, Rs will equal to 1/2RL(k-1). A good impedance matching assumes: From (4) and (5) it becomes: By fixing an arbitrary value for R2, (6) gives: Finally, the values of R2 and R3 allow us to extract R1 from (1), and it comes: with GL the required gain. CAPABILITIES The table below shows the calculated compo- nents for different values of k. In this case R2=1000 Ω and the gain=16dB. The last column displays the maximum amplitude level on the line regarding the TS613 maximum output capabilities (18Vpp diff.) and a 1:2 line transformer ratio. MEASUREMENT OF THE POWER CONSUMPTION IN THE ADSL APPLICATION Conditions: Passive impedance matching Transformer turns ratio: 2 Power Supply: 12V Maximun level required on the line: 12.4Vpp Maximum output level of the driver: 12.4Vpp Crest factor: 5.3 (Vp/Vrms) The TS613 power consumption during emission on 900 and 4550 meter twisted pair telephone lines: 360mW Figure 5 : Equivalent schematic. Ro is the syn- thesized impedance Ro Rs 1 R2 R3 ------- – ----------------- 4 () , = Ro Vi.Gi Iout 1/2 RL Ro kVoRL RL 2Rs1 + --------------------------- = Ro 1 2 ---RL 5 () , = R2 R3 ------- 1 2Rs RL ---------- 6 () , – = R3 R2 1 2Rs RL ---------- – ------------------- = R1 2R2 21 R2 R3 ------- – GL 1 – R2 R3 ------- – --------------------------------------------------------- 7 () , = 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) Abritrary 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 (Vpp diff) Maximum Line level (Vpp diff) 1.3 820 1500 3.9 8 27.5 1.4 490 1600 5.1 8.7 25.7 1.5 360 2200 6.2 9.3 25.3 1.6 270 2400 7.5 9.9 23.7 1.7 240 3300 9.1 10.5 22.3 Passive matching 12.4 18 |
同様の部品番号 - TS613ID |
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同様の説明 - TS613ID |
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