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AFCT-5760NPZ Datasheet(PDF) 3 Page - AVAGO TECHNOLOGIES LIMITED |
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AFCT-5760NPZ Datasheet(HTML) 3 Page - AVAGO TECHNOLOGIES LIMITED |
3 / 19 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 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 for NRZ code. Connection to the transmitter is provided via a LC optical connector. The transmitter has full IEC 825 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. The transmit- ter output can also be disabled and monitored via the 2-wire serial interface. In the event of a transceiver fault, such as the activation of the eye safety circuit, toggling of the TX_DISABLE will reset the transmitter, as depicted in Figure 2. Figure 2. Typical Application Configuration TX_FAULT A laser fault or a low VCC condition will activate the trans- mitter fault signal, TX_FAULT, and disable the laser. This signal is an open collector output (pull-up required on the host board); A low signal indicates normal laser op- eration and a high signal indicates a fault. The TX_FAULT will be latched high when a laser fault occurs and is cleared by toggling the TX_DISABLE input or power cycling the transceiver. The TX_FAULT is not latched for Low VCC. The transmitter fault condition can also be monitored via the two-wire serial interface (address A2, byte 110, bit 2). By default, TX_FAULT is set to trigger on hardware faults only. |
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