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HFBR-5527 Datasheet(PDF) 10 Page - Agilent(Hewlett-Packard) |
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HFBR-5527 Datasheet(HTML) 10 Page - Agilent(Hewlett-Packard) |
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10 / 12 page  174 The HFBR-5527 is typically used to construct 125 MBd digital fiber-optic receivers which use the same +5 volt power supply that powers the host system’s microprocessors, CMOS logic, or TTL logic. To build a digital receiver, the analog HFBR-5527 component must be connected to a post amplifier and a compara- tor. This post amplifier plus comparator function is commonly known as a quantizer. The 0 V common and +5 V power supply connections for the HFBR-5527 and quantizer must be isolated from the host system’s power and ground planes by a low pass filter. This recommended low pass filter assures that the electrical noise normally present in the host system’s digital logic power supply will not reduce the sensitivity of fiber-optic receivers implemented with the HFBR-5527. The quantizer and power supply filter circuits recommended for use with the HFBR-5527 are shown in Figure 7 of HP Application Note 1066. For optimum performance, the HFBR-5527 should be used with the same quantizer and power supply filters recommended for use with HP’s HFBR-15X7 and HFBR-25X6 components. To maximize immunity to electrical Figure 9. Recommended Power Supply Filter Circuit. noise, pins 3, 9, and 10 of the HFBR-5527 should be connected to filtered receiver common. For best common mode noise rejection, the connections between pins 1 and 2 of the HFBR-5527 and the quantizer’s differential input should be of equal length, and the components in both traces should be placed to achieve symmetry. The preceding recommendations minimize the cross talk between the fiber-optic transmitter and receiver. These recommendations also improve the fiber-optic receiver’s immunity to environmental noise and the host system’s electrical noise. VCC 0.1 µF 0.47 µF 4.7 Ω 4.7 Ω RX ANALOG OUTPUT 1 4 9 10 2.3 RECEIVER |
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