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HFBR-1415C Datasheet(PDF) 11 Page - Agilent(Hewlett-Packard) |
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HFBR-1415C Datasheet(HTML) 11 Page - Agilent(Hewlett-Packard) |
11 / 25 page 11 5 MBd Logic Link Design If resistor R1 in Figure 2 is 70.4 W, a forward current IF of 48 mA is applied to the HFBR-14x4 LED transmitter. With IF = 48 mA the HFBR-14x4/24x2 logic link is guaranteed to work with 62.5/125 µm fiber optic cable over the entire range of 0 to 1750 meters at a data rate of dc to 5 MBd, with arbitrary data format and pulse width distortion typically less than 25%. By setting R1 = 115 W, the transmitter can be driven with IF = 30 mA, if it is desired to economize on power or achieve lower pulse distortion. The following example will illustrate the technique for selecting the appropriate value of IF and R1. Maximum distance required = 400 meters. From Figure 3 the drive current should be 15 mA. From the transmitter data VF = 1.5 V (max.) at IF = 15 mA as shown in Figure 9. The curves in Figures 3, 4, and 5 are constructed assuming no inline splice or any additional system loss. Should the link consists of any in-line splices, these curves can still be used to calculate link limits provided they are shifted by the additional system loss expressed in dB. For example, Figure 3 indicates that with 48 mA of transmitter drive current, a 1.75 km link distance is achievable with 62.5/125 µm fiber which has a maximum attenuation of 4 dB/km. With 2 dB of additional system loss, a 1.25 km link distance is still achievable. Figure 2. Typical Circuit Configuration. Ω = − = − = 233 R mA 15 I 1.5V 5V V V R 1 F F CC 1 +5 V SELECT R 1 TO SET IF R 1 I F 1 K Ω DATA IN ½ 75451 2 6 7 3 T HFBR-14xx TRANSMITTER TRANSMISSION DISTANCE = HFBR-24x2 RECEIVER R TTL DATA OUT 2 6 7 & 3 R L V CC 0.1 µF NOTE: IT IS ESSENTIAL THAT A BYPASS CAPACITOR (0.01 µF TO 0.1 µF CERAMIC) BE CONNECTED FROM PIN 2 TO PIN 7 OF THE RECEIVER. TOTAL LEAD LENGTH BETWEEN BOTH ENDS OF THE CAPACITOR AND THE PINS SHOULD NOT EXCEED 20 MM. |
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Similar Description - HFBR-1415C |
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