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HFBR-53A5VEM 数据表(PDF) 4 Page - Agilent(Hewlett-Packard) |
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HFBR-53A5VEM 数据表(HTML) 4 Page - Agilent(Hewlett-Packard) |
4 / 14 page 4 data duty factor), then the output optical power will gradually change its average output optical power level to its pre-set value. The receiver section is internally ac-coupled between the pre- amplifier and the post-amplifier stages. The actual Data and Data- bar outputs of the post-amplifier are ac-coupled to their respective output pins (pins 2, 3). Signal Detect is a single-ended, TTL output signal that is dc-coupled to pin 4 of the module. Signal Detect should not be ac-coupled externally to the follow-on circuits because of its infrequent state changes. Caution should be taken to account for the proper intercon- nection between the supporting Physical Layer integrated circuits and this HFBR-53A5VEM/FM transceiver. Figure 3 illustrates a recommended interface circuit for interconnecting to a dc PECL compatible fiber-optic transceiver. Eye Safety Circuit For an optical transmitter device to be eye-safe in the event of a single fault failure, the transmit- ter must either maintain normal, eye-safe operation or be disabled. In the HFBR-53A5VEM/FM there are three key elements to the laser driver safety circuitry: a monitor diode, a window detector circuit, and direct control of the laser bias. The window detection circuit monitors the average optical power using the monitor diode. If a fault occurs such that the transmitter DC regulation circuit cannot maintain the preset bias conditions for the laser emitter within ± 20%, the transmitter will automatically be APPLICATION SUPPORT Optical Power Budget and Link Penalties The worst-case Optical Power Budget (OPB) in dB for a fiber- optic link is determined by the difference between the minimum transmitter output optical power (dBm avg) and the lowest receiver sensitivity (dBm avg). This OPB provides the necessary optical signal range to establish a working fiber-optic link. The OPB is allocated for the fiber-optic cable length and the corre- sponding link penalties. For proper link performance, all penalties that affect the link performance must be accounted for within the link optical power budget. The Gigabit Ethernet IEEE 802.3z standard identifies, and has modeled, the contributions of these OPB penalties to establish the link length requirements for 62.5/125 µm and 50/125 µm multimode fiber usage. Refer to the IEEE 802.3z standard and its supplemental documents that develop the model, empirical results and final specifications. Data Line Interconnections Agilent’s HFBR-53A5VEM/FM fiber-optic transceiver is designed for compatible PECL signals. The transmitter inputs are internally ac-coupled to the laser driver circuit from the transmitter input pins (pins 7, 8). The transmitter driver circuit for the laser light source is an ac-coupled circuit. This circuit regulates the output optical power. The regulated light output will maintain a constant output optical power provided the data pattern is reasonably balanced in duty factor. If the data duty factor has long, con- tinuous state times (low or high disabled. Once this has occurred, only an electrical power reset will allow an attempted turn-on of the transmitter. Signal Detect The Signal Detect circuit provides a deasserted output signal that implies the link is open or the transmitter is OFF as defined by the Gigabit Ethernet specification IEEE 802.3z, Table 38.1. The Signal Detect threshold is set to transition from a high to low state between the minimum receiver input optional power and –30 dBm avg. input optical power indicating a definite optical fault (e.g., unplugged connector for the receiver or transmitter, broken fiber, or failed far-end transmitter or data source). A Signal Detect indicating a working link is functional when receiving encoded 8B/10B characters. The Signal Detect does not detect receiver data error or error-rate. Data errors are determined by Signal processing following the transceiver. Electromagnetic Interference (EMI) One of a circuit board designer’s foremost concerns is the control of electromagnetic emissions from electronic equipment. Success in controlling generated Electromagnetic Interference (EMI) enables the designer to pass a governmental agency’s EMI regulatory standard; and more importantly, it reduces the possibility of interference to neighboring equipment. The EMI performance of an enclosure using these transceivers is dependent on the chassis design. Agilent encourages using standard RF suppression practices and avoiding poorly EMI-sealed enclosures. |
类似零件编号 - HFBR-53A5VEM |
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类似说明 - HFBR-53A5VEM |
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