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DP83865 Datasheet(PDF) 70 Page - National Semiconductor (TI) |
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DP83865 Datasheet(HTML) 70 Page - National Semiconductor (TI) |
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70 / 86 page  www.national.com 70 5.0 Design Guide (Continued) 5.13.2 Magnetics It is important to select the compoment that meets the requirements. Per IEEE 802.3ab Clause 40.8, the compo- nent requirements are listed in Table 57. In addition, the transformer winding should have the configuration shown in Figure 21. The recommended magnetics has an isola- tion transformer followed by a common mode choke to reduce EMI. There is an additional auto-transformer which is center tapped. To save board space and reduce compo- nent count, RJ-45 with integrated magnetics may be used. The following are magnetics meeting the requirements (Table 57). Figure 21. Transformer configuration (1 ch) TCT TD+ TD- MCT MX+ MX- Table 57. Magnetics Requirements Parameter Min Typ Max Units Condition Turn Ratio - 1:1 - - ± 1% Insertion Loss - - -1.1 dB 0.1 - 1 MHz - - -0.5 dB 1 - 60 MHz - - -1.0 dB 60 - 100 MHz - - -1.2 dB 100 - 125 MHz Return Loss -18 - - dB 1 - 30 MHz -14.4 - - dB 30 - 40 MHz -13.1 - - dB 40 - 50 MHz -12 - - dB 50 - 80 MHz -10 - - dB 80 - 100 MHz Differential to Common Rejection Ration -43 - - dB 1 - 30 MHz -37 - - dB 30 - 60 MHz -33 - - dB 60 - 100 MHz Crosstalk -45 - - dB 1 - 30 MHz -40 - - dB 30 - 60 MHz -35 - - dB 60 - 100 MHz Isolation 1,500 - - Vrms HPOT Rise Time - 1.6 1.8 ns 10 - 90 % Primary Inductance 350 - - uH - Table 58. Recommended Magnetics Manufacturer Description Part Number Bel Fuse, Inc. www.belfuse.com 10/100/1000 Mbps Isolation Transformer S558-5999-P3 10/100/1000 Mbps Isolation Transformer S558-5999-T3 10/100/1000 Mbps2X1 Integrated Magnetics 0843-2B1T-33 Delta www.delta.tw 10/100/1000 Mbps Isolation Transformer LF9203 Halo www.haloelectronics.com 10/100/1000 Mbps Isolation Transformer TG1G-S002NZ Midcom www.haloelectronics.com 10/100/1000 Mbps Isolation Transformer 000-7093-37R Pulse Engineering, Inc. www.pulseeng.com 10/100/1000 Mbps Isolation Transformer H5007 10/100/1000 Mbps Isolation Transformer H5008 Note: Contact Magnetics manufactures for latest part numbers and product specifications. All Magnetics should be thor- oughly tested and validated before using them in production. |
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