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P3357 Datasheet(PDF) 3 Page - ETAL Group |
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P3357 Datasheet(HTML) 3 Page - ETAL Group |
3 / 5 page P3357 ETALDOC 724/7 Page 3 of 5 April 2005 MATCHING RECOMMENDATIONS The following recommendations start with the simplest implementations and progress to enhanced performance utilizing additional components. Good performance is achieved even with the simplest configurations. The implementations assume a low impedance balanced TX drive and a relatively high impedance RX input, as is commonly available, though use with other TX/RX arrangements is straightforward. Note that there are no changes to components on the line side, or in the hybrid, whether 600 Ω or complex reference impedance selected, thus assisting country configuration. For complex impedance, the matching circuits derived are suitable for reference impedances of the type 270 + 750//150nF e.g. European CTR21 and 220 + 820//120nF (or 115nF) e.g. Australia, South Africa, etc., and yield similar performance characteristics. For other impedances, please contact Profec Technologies. Minimum Cost Implementations Insertion Loss: 1.8dB @ 2kHz Frequency Response : ±0.2dB 30Hz – 10kHz Return Loss: 16dB 200Hz – 4kHz Transhybrid Loss: 22dB 200Hz – 4kHz Improved matching Insertion Loss: 1.8dB @ 2kHz Frequency Response : ±0.2dB 30Hz – 10kHz Return Loss: 18dB 200Hz – 4kHz Transhybrid Loss: 22dB 50Hz – 10kHz Insertion Loss: 1.0dB @ 2kHz Frequency Response : ±0.5dB 50Hz – 4kHz Return Loss: 18dB 200Hz – 4kHz Transhybrid Loss: 14dB 200Hz – 4kHz Insertion Loss: 1.0dB @ 2kHz Frequency Response : ±0.5dB 50Hz – 4kHz Return Loss: 20dB 200Hz – 4kHz Transhybrid Loss: 16dB 50Hz – 4kHz 600Ω Fig . 4 LINE 600 10nF 560 RXA TXA2 TXA1 μ 22 F 600Ω Fig . 2 LINE 600 560 RXA TXA2 TXA1 μ 22 F 10nF LINE 270 (220) 750 (820) μ 22 F 150nF (120nF) 750 100nF* * Note: 100nF c a pac itor should have a tempera ture stable dielec tric 120 European CTR21/(Australia, etc.) Fig. 5 RXA TXA2 TXA1 LINE 270 (220) 750 (820) 150nF (120nF) 820 100nF* * Note: 100nF c a pac itor should have a tempera ture stable dielec tric 100 European CTR21/(Australia, etc.) Fig. 3 RXA TXA2 TXA1 μ 22 F Patented |
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