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HFBR-772BHWZ Datasheet(PDF) 2 Page - AVAGO TECHNOLOGIES LIMITED |
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HFBR-772BHWZ Datasheet(HTML) 2 Page - AVAGO TECHNOLOGIES LIMITED |
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2 / 25 page  2 Design Summary: Design for low-cost, high-volume manufacturing Avago’s parallel optics solution combines twelve 2.7 Gbd channels into discrete transmitter and receiver modules providing a maximum aggregate data rate of 32 Gb/s. Moreover, these modules employ a heat sink for thermal management when used on high-density cards, have ex- cellent EMI performance, and interface with the industry standard MTP®/MPO connector systems. They provide the most cost-effective high- density (Gbd per inch) solutions for high-data capacity applications. See Figure 1 for the transmitter and Figure 2 for the receiver block diagrams. The HFBR-772BWZ transmitter and the HFBR-782BZ re- ceiver modules provide very closely spaced, high-speed parallel data channels. Within these modules there will be some level of cross talk between channels. The cross talk within the modules will be exhibited as additional data jitter or sensitivity reduction compared to single-channel performance. Avago Technologies’ jitter and sensitivity specifications include cross talk penalties and thus rep- resent real, achievable module performance. Functional Description, Transmitter Section The transmitter section, Figure 1, uses a 12-channel 850 nm VCSEL array as the optical source and a diffractive op- tical lens array to launch the beam of light into the fiber. The package and connector system are designed to allow repeatable coupling into standard 12-fiber ribbon cable. In addition, this module has been designed to be compli- ant with IEC 60825 Class 1 eye safety requirements. The optical output is controlled by a custom IC, which provides proper laser drive parameters and monitors drive current to ensure eye safety. An EEPROM and state machine are programmed to provide both ac and dc cur- rent drive to the laser to ensure correct modulation, eye diagram and extinction ratio over variations of tempera- ture and power supply voltages. Functional Description, Receiver Section The receiver section, Figure 2, contains a 12-channel AlGaAs/ GaAs photodetector array, transimpedance preamplifier, filter, gain stages to amplify and buffer the signal, and a quantizer to shape the signal. The Signal Detect function is designed to sense the proper optical output signal on each of the 12 channels. If loss of signal is detected on an individual channel, that channel output is squelched. Packaging The flexible electronic subassembly was designed to allow high-volume assembly and test of the VCSEL, PIN photo diode and supporting electronics prior to final assembly. Regulatory Compliance The overall equipment design into which the parallel optics module is mounted will determine the certifica- tion level. The module performance is offered as a figure of merit to assist the designer in considering their use in the equipment design. Organization Recognition See the Regulatory Compliance Table for a listing of the standards, standards associations and testing laboratories applicable to this product. Electrostatic Discharge (ESD) There are two design cases in which immunity to ESD damage is important. The first case is during handling of the module prior to mounting it on the circuit board. It is important to use normal ESD handling precautions for ESD sensitive de- vices. These precautions include using grounded wrist straps, work benches, and floor mats in ESD controlled areas. The second case to consider is static discharges to the exterior of the equipment chassis containing the mod- ule parts. To the extent that the MTP® (MPO) connector receptacle is exposed to the outside of the equipment chassis it may be subject to system level ESD test criteria that the equipment is intended to meet. See the Regulatory Compliance Table for further details. |
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