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AFBR-703SMZ Datasheet(PDF) 3 Page - AVAGO TECHNOLOGIES LIMITED |
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AFBR-703SMZ Datasheet(HTML) 3 Page - AVAGO TECHNOLOGIES LIMITED |
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3 / 19 page  3 Figure 1. Transceiver functional diagram Transmit Fault (TX_FAULT) A catastrophic laser fault will activate the transmitter 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 operation 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 transmitter fault condition can also be monitored via the two-wire serial interface (address A2, byte 110, bit 2). Transmitter Section The transmitter section includes the Transmitter Opti- cal Sub-Assembly (TOSA) and laser driver circuitry. The TOSA, containing an Avago designed and manufactured 850 nm VCSEL (Vertical Cavity Surface Emitting Laser) light source, is located at the optical interface and mates with the LC optical connector. The TOSA is driven by an IC which uses the incoming differential high speed logic signal to modulate the laser diode driver current. This Tx laser driver circuit regulates the optical power at a con- stant level provided the incoming data pattern is DC bal- anced. Transmit Disable (TX_DISABLE) The AFBR-703SMZ accepts an LVTTL compatible trans- mit disable control signal input which shuts down the transmitter optical output. A high signal implements this function while a low signal allows normal transceiver op- eration. In the event of a fault (e.g. eye safety circuit ac- tivated), cycling this control signal resets the module as depicted in Figure 6. An internal pull up resistor disables the transceiver transmitter until the host pulls the input low. TX_DISABLE can also be asserted via the two-wire interface (address A2h, byte 110, bit 6) and monitored (address A2h, byte 110, bit 7). The contents of A2h, byte 110, bit 6 are logic OR’d with hardware TX_DISABLE (contact 3) to control transmitter operation. LIGHT FROM FIBER LIGHT TO FIBER PHOTO-DETECTOR RECEIVER AMPLIFICATION & QUANTIZATION RD+ (RECEIVE DATA) RD– (RECEIVE DATA) RX_LOS VCSEL TRANSMITTER LASER DRIVER & SAFETY CIRCUITRY TX_DISABLE TD+ (TRANSMIT DATA) TD– (TRANSMIT DATA) TX_FAULT ELECTRICAL INTERFACE SDA SCL MOD-ABS CONTROLLER & MEMORY OPTICAL INTERFACE RS0 RS1 |
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