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HFBR-5208AM Datasheet(PDF) 6 Page - Agilent(Hewlett-Packard) |
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HFBR-5208AM Datasheet(HTML) 6 Page - Agilent(Hewlett-Packard) |
6 / 21 page 5 Figure 5. Recommended Board Layout Pattern Figure 6. 622.08 Mb/s OC-12 ATM-SONET/SDH Reference Design Board 20.32 (0.800) TOP VIEW 2 x Ø 1.9 ± 0.1 (0.075 ± 0.004) 20.32 (0.800) 2.54 (0.100) 9 x Ø 0.8 ± 0.1 (0.032 ± 0.004) DIMENSIONS ARE IN MILLIMETERS (INCHES) Reference Design Agilent has developed a reference design for multimode and single- mode OC-12 ATM-SONET/SDH applications shown in Figure 6. This reference design uses a Vitesse Semiconductor Inc.’s VSC8117 clock recovery/clock generation/serializer/deserializer integrated circuit and a PMC- Sierra Inc. PM5355 framer IC. Application Note 1178 documents the design, layout, testing and performance of this reference design. Gerber files, schematic and application note are available from the Agilent Fiber-Optics Components’ web site at the URL of http://www.semiconductor. agilent.com. Operation in -5.2 V Designs For applications that require -5.2 V dc power supply level for true ECL logic circuits, the HFBR/HFCT-5208M transceiver can be operated with a VCC = 0 V dc and a VEE = -5.2 V dc. This transceiver is not specified with an operating, negative power supply voltage. The potential compromises that can occur with use of -5.2 V dc power are that the absolute voltage states for VOH and VOL will be changed slightly due to the 0.2 V difference in supply levels. Also, noise immunity may be compromised for the HFBR/HFCT-5208M trans- ceiver because the ground plane is now the VCC supply point. The suggested power supply filter circuit shown in the Recommended Circuit Schematic figure should be located in the VEE paths at the transceiver supply pins. Direct coupling of the differential data signal can be done between the HFBR-5208M transceiver and the standard ECL circuits. For guaranteed -5.2 V dc operation, contact your local Agilent Component Field Sales Engineer for assistance. 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. There are three options available for the HFBR/HFCT-5208M with regard to EMI shielding for providing the designer with a means to achieve good EMI performance. 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. In addition, Agilent advises that for the best EMI performance, the metalized case must be connected to chassis ground using one of the shield options. |
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