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HFBR-5805A Datasheet(PDF) 7 Page - Agilent(Hewlett-Packard) |
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HFBR-5805A Datasheet(HTML) 7 Page - Agilent(Hewlett-Packard) |
7 / 14 page 7 Figure 7. Recommended Decoupling and Termination Circuits ;; ;; ;; ;;; ;;; ;;; ;; ;; ;; ;; ;; ;;; ;;; ;; ;; ;;; ;;; ;; ;; ;; ;; ;;; ;;; ;; ;; ;; ;; ;; ;; ;;; ;;; ;; ;; ;; ;; ;; ;; ;; ;; ;; NO INTERNAL CONNECTION NO INTERNAL CONNECTION HFBR-5805 TOP VIEW V EE RD RD SD V CC V CC TD TD V EE 1 2 34 56 7 8 9 C1 C2 L1 L2 R2 R3 R1 R4 C5 C3 C4 R9 R10 V CC FILTER AT V CC PINS TRANSCEIVER R5 R7 R6 R8 C6 RD RD SD V CC TD TD TERMINATION AT PHY DEVICE INPUTS NOTES: THE SPLIT-LOAD TERMINATIONS FOR ECL SIGNALS NEED TO BE LOCATED AT THE INPUT OF DEVICES RECEIVING THOSE ECL SIGNALS. RECOMMEND 4-LAYER PRINTED CIRCUIT BOARD WITH 50 OHM MICROSTRIP SIGNAL PATHS BE USED. R1 = R4 = R6 = R8 = R10 = 130 OHMS FOR +5.0 V OPERATION, 82 OHMS FOR +3.3 V OPERATION. R2 = R3 = R5 = R7 = R9 = 82 OHMS FOR +5.0 V OPERATION, 130 OHMS FOR +3.3 V OPERATION. C1 = C2 = C3 = C5 = C6 = 0.1 µF. C4 = 10 µF. L1 = L2 = 1 µH COIL OR FERRITE INDUCTOR. TERMINATION AT TRANSCEIVER INPUTS Rx Rx Tx Tx V CC V CC Rx Tx Recommended Handling Precautions Agilent recommends that normal static precautions be taken in the handling and assembly of these transceivers to prevent damage which may be induced by electrostatic discharge (ESD). The HFBR-5800 series of transceivers meet MIL-STD- 883C Method 3015.4 Class 2 products. Care should be used to avoid shorting the receiver data or signal detect outputs directly to ground without proper current limiting impedance. Solder and Wash Process Compatibility The transceivers are delivered with protective process plugs inserted into the duplex SC or duplex ST connector receptacle. This process plug protects the optical subassemblies during wave solder and aqueous wash processing and acts as a dust cover during shipping. These transceivers are compat- ible with either industry standard wave or hand solder processes. Shipping Container The transceiver is packaged in a shipping container designed to protect it from mechanical and ESD damage during shipment or storage. Board Layout - Decoupling Circuit and Ground Planes It is important to take care in the layout of your circuit board to achieve optimum performance from these transceivers. Figure 7 provides a good example of a schematic for a power supply decoupling circuit that works well with these parts. It is further recommended that a contiguous ground plane be provided in the circuit board directly under the transceiver to provide a low inductance ground for signal return current. This recommendation is in keeping with good high frequency board layout practices. Board Layout - Hole Pattern The Agilent transceiver complies with the circuit board “Common Transceiver Footprint” hole pattern defined in the original multisource announcement which defined the 1 x 9 package style. This drawing is reproduced in Figure 8 with the addition of ANSI Y14.5M compliant dimensioning to be used as a guide in the mechanical layout of your circuit board. |
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