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XRT5897IV Datasheet(PDF) 2 Page - Exar Corporation |
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XRT5897IV Datasheet(HTML) 2 Page - Exar Corporation |
2 / 21 page XRT5897 2 Rev. 1.11 BLOCK DIAGRAM Figure 1. XRT5897 Block Diagram RTIP7 (69) RXPOS7 (5) RRING7 (68) TXCLK7 (87) TTIP7 (89) TRING7 (91) LOSSEL (38) LOSCNT (73) RXNEG7 (6) LOS7 (4) TXPOS7 (85) TXNEG7 (86) Singnal Peak LOS Detect Loss Delay MUX O Pulse Shaping NRZ To Duty Cycle MUX 0 2:1 1:2 R1 RING RING TIP RX INPUT TIP TX OUTPUT Receive Comparators Line Drivers R2 R3 9.1 R4 9.1 Tranceiver 7 Detector Counter 1 RZ Adjust 0 1 1 Transmit Tranceiver 6 Tranceiver 5 Tranceiver 4 Tranceiver 3 Tranceiver 2 Tranceiver 1 VCC Receiver Notes D The same type 1:2CT ratio transformer may be used at the receiver input and transmitter output. D R1 and R2 are both 150W for 75W operation, or 240W for 120W operation. D Return loss exceeds ITU G.703 specification with these resistors and a 1:2CT ratio input transformer. LOS (Loss of Signal) Notes D LOSSEL (pin 38) is connected to logic “1” for ITU G.775 compliant LOS delay, or to logic 0 for user programmable additional delay. D LOSCNT (pin 73) is unconnected when LOSSEL is logic 1, or connected to an external clock when LOSSEL is logic 0. Transmitter Notes D Return loss exceeds ETSI 300 166 specification with a 1:2 ratio transformer. D R3 and R4 are always 9.1W for both 75W and 120W applications. D An approach exists that permits the user to operate the XRT5897 with a 5V power supply. For more information, please see application note TAN-12. |
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