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AFBR-57R5APZ Datasheet(PDF) 3 Page - AVAGO TECHNOLOGIES LIMITED |
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AFBR-57R5APZ Datasheet(HTML) 3 Page - AVAGO TECHNOLOGIES LIMITED |
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3 / 22 page  3 Figure 1. Transceiver functional diagram. Rx Vout & Emphasis Rx CDR Tx Equalization Tx CDR LIGHT FROM FIBER LIGHT TO FIBER PHOTO-DETECTOR RECEIVER AMPLIFICATION & QUANTIZATION RD+ (RECEIVE DATA) RD- (RECEIVE DATA) Rx LOSS OF SIGNAL VCSEL TRANSMITTER LASER DRIVER & SAFETY CIRCUITRY TX_DISABLE TD+ (TRANSMIT DATA) TD- (TRANSMIT DATA) TX_FAULT ELECTRICAL INTERFACE MOD-DEF2 (SDA) MOD-DEF1 (SCL) MOD-DEF0 µController OPTICAL INTERFACE Rx RATE SELECT RS(0) Tx RATE SELECT RS(1) tween successive assertions of this control signal. Tx_Dis- able can also be asserted via the two-wire serial 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 (pin 3) to control transmitter opera- tion. Transmit Fault (Tx_Fault) A catastrophic laser fault will activate the transmitter sig- nal, 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). Eye Safety Circuit The AFBR-57F5PZ provides Class 1 (single fault tolerant) eye safety by design and has been tested for compliance with the requirements listed in Table 1. The eye safety circuit continuously monitors the optical output power level and will disable the transmitter upon detecting an unsafe condition beyond the scope of Class 1 certification. Such unsafe conditions can be due to inputs from the host board (Vcc fluctuation, unbalanced code) or a fault within the transceiver. Transmitter Section The transmitter section includes a Transmitter Optical SubAssembly (TOSA), laser driver circuit, Clock and Data Recovery circuit (CDR) and an electrical input stage with variable equalization controls and electrical eye mea- surement capability. The TOSA contains a 850nm Vertical Cavity Surface Emitting Laser (VCSEL) light source with integral light monitoring function and imaging optics to assure efficient optical coupling to the LC connector in- terface. The TOSA is driven by a laser driver IC, which uses the differential output from an integral Tx CDR stage to modulate and regulate VCSEL optical power. As mandated by FC-PI-5, the integral CDR cleans up any incoming jitter accumulated from the host ASIC, PCB traces and SFP elec- trical connector. Between the SFP electrical connector and Tx CDR is a variable, i2c controlled, equalization circuit to optimize SFP performance with non-ideal incoming elec- trical waveforms. Note the Tx CDR is engaged only with Tx_RATE=high (16GFC) and bypassed with Tx_RATE=low (8G/4G). Transmit Disable (Tx_Disable) The AFBR-57F5PZ accepts a TTL and CMOS compatible transmit disable control signal input (pin 3) which shuts down the transmitter optical output. A high signal im- plements this function while a low signal allows normal transceiver operation. In the event of a fault (e.g. eye safe- ty circuit activated), cycling this control signal resets the module as depicted in Figure 4. An internal pull up resistor disables the transceiver transmitter until the host pulls the input low. Host systems should allow a 10 ms interval be- |
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