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AFCT-5705ALZ Datasheet(PDF) 3 Page - AVAGO TECHNOLOGIES LIMITED |
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AFCT-5705ALZ Datasheet(HTML) 3 Page - AVAGO TECHNOLOGIES LIMITED |
3 / 20 page 3 LASER DRIVER & SAFETY CIRCUITRY 50 Ω 50 Ω SO+ SO– AMPLIFICATION & QUANTIZATION 50 Ω 50 Ω SI+ SI– VREFR VREFR TBC EWRAP RBC Rx_RATE Rx_LOS GPIO(X) GPIO(X) GP14 REFCLK Tx_FAULT TBC EWRAP RBC Rx_RATE REFCLK TX[0:9] RX[0:9] Tx_FAULT Tx_DISABLE TD+ TD– TX GND MOD_DEF2 EEPROM MOD_DEF1 MOD_DEF0 RX GND 4.7 K to 10 K Ω 3.3 V 4.7 K to 10 K Ω 3.3 V 4.7 K to 10 K Ω 4.7 K to 10 K Ω 106.25 MHz PROTOCOL IC SFP MODULE VCC,T 1 µH 1 µH 10 µF 0.1 µF 3.3 V 4.7 K to 10 K Ω 10 µF 0.1 µF 0.1 µF 4.7 K to 10 K Ω RD+ RD– Rx_LOS 0.01 µF 0.01 µF 100 Ω 0.01 µF 0.01 µF VCC,R 100 Ω 50 Ω VCC,R 50 Ω VCC,R Transmitter Section The transmitter section includes a 1310 nm Fabry-Perot laser and a transmitter driver circuit. The driver circuit maintains a constant optical power level provided that the data pattern is valid 8B/10B code. Connection to the transmitter is provided via a LC optical connector. The transmitter has full IEC 60825 and CDRH Class 1 eye safety. TX_DISABLE The transmitter output can be disabled by asserting pin 3, TX_DISABLE. A high signal asserts this function while a low signal allows normal laser operation. In addition, via the 2-wire serial interface the transmitter output can be disabled (address A2h, byte 110, bit 6) or monitored (address A2h, byte 110, bit 7). The contents of A2h, byte 110, bit 6 are logic OR’d with hardware Tx_Disable (pin 3) to control transmitter operation. In the event of a transceiver fault, such as the activation of the eye safety circuit, toggling of the TX_DISABLE will reset the trans- mitter, as depicted in Figure 4. Figure 3. Typical Application Configuration VEET 20 TD– 19 TD+ 18 VEET 17 VCCT 16 VCCR 15 VEER 14 RD+ 13 RD– 12 VEER 11 TOP OF BOARD VEET 1 TX FAULT 2 TX DISABLE 3 MOD-DEF(2) 4 MOD-DEF(1) 5 MOD-DEF(0) 6 RATE SELECT 7 LOS 8 VEER 9 VEER 10 BOTTOM OF BOARD (AS VIEWED THROUGH TOP OF BOARD) ENGAGEMENT SEQUENCE 3 2 1 3 2 1 Figure 2. Pin description of the SFP electrical interface. |
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