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CS61577-IP1 Datasheet(PDF) 37 Page - Cirrus Logic |
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CS61577-IP1 Datasheet(HTML) 37 Page - Cirrus Logic |
37 / 44 page NOTES: 1. A letter at the intersection of a row and column in Table 2 indicates that the selected transformer is supported for use with the device. The transformer is installed in the evaluation board with pin 1 po- sitioned to match the letter illustrated in the drawing to the left. 2. The receive transformer (RX) is soldered at location T2 on the evaluation board and is used for all applications. The transmit transformer (TX) is socketed at location T1 on the evaluation board and may be changed according to the application. 3. For use in 100 Ω T1 twisted-pair applications only. 4. For use in 75 Ω and 120Ω E1 applications only. Place jumper JP5 in position F-F for 75 Ω E1 applications requiring a 1:1 turns ratio. 5. Transmitter return loss improves when using a 1:2 turns ratio trans- former with the appropriate transmit resistors. Table 2. Transformer Applications TRANSFORMER (Turns Ratio) 1,2 LINE INTERFACE UNIT ’34 ’35 ’35A ’58 ’58A ’74,’77 ’74A ’75 ’304A, ’305A RX TX RX TX RX TX RX TX RX TX RX TX RX TX RX TX RX TX PE-65351 (1:2CT) A D A D A A D A A D A A A Schott 12930 (1:2CT) B C B C B B C B B C B B B PE-65388 (1:1.15) D 3 D 3 D 3 D 3 D 3,5 Schott 12931 (1:1.15) C 3 C 3 C 3 C 3 C 3,5 PE-65389 (1:1:1.26) D 4 D 4 D 4 D 4 D 4,5 Schott 12932 (1:1:1.26) C 4 C 4 C 4 C 4 C 4,5 PE-64951 (dual 1:2CT) E E E E Schott 11509 (dual 1:2CT) E E E E PE-65565 (dual 1:1.15 & 1:2CT) E 3 E 3 E 3 E 3 E 3,5 Schott 12531 (dual 1:1.15 & 1:2CT) E 3 E 3 E 3 E 3 E 3,5 PE-65566 (dual 1:1:1.26 & 1:2CT) E 4 E 4 E 4 E 4 E 4,5 Schott 12532 (dual 1:1:1.26 & 1:2CT) E 4 E 4 E 4 E 4 E 4,5 E T2 T1 D A C B T2 T1 LINE INTERFACE EVALUATION BOARD DS40DB3 37 |
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