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HFBR-0400 Datasheet(PDF) 22 Page - Agilent(Hewlett-Packard) |
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HFBR-0400 Datasheet(HTML) 22 Page - Agilent(Hewlett-Packard) |
22 / 31 page 67 HFBR-24X6 Low-Cost 125 MHz Receiver Description The HFBR-24X6 fiber optic receiver is designed to operate with the Hewlett-Packard HFBR- 14XX fiber optic transmitters and 50/125 µm, 62.5/125 µm, 100/ 140 µm and 200 µm HCS® fiber optic cable. Consistent coupling into the receiver is assured by the lensed optical system (Figure 1). Response does not vary with fiber size for core diameters of 100 µm or less. The receiver output is an analog signal which allows follow-on circuitry to be optimized for a variety of distance/data rate requirements. Low-cost external components can be used to convert the analog output to logic compatible signal levels for various data formats and data rates up to 175 MBd. This distance/data rate tradeoff results in increased optical power budget at lower data rates which can be used for additional distance or splices. The HFBR-24X6 receiver contains a PIN photodiode and low noise transimpedance pre-amplifier integrated circuit. The HFBR-24X6 receives an optical signal and converts it to an analog voltage. The output is a buffered emitter- follower. Because the signal amplitude from the HFBR-24X6 receiver is much larger than from a simple PIN photodiode, it is less susceptible to EMI, especially at high signaling rates. For very noisy environments, the conductive or metal port option is recommended. A receiver dynamic range of 23 dB over temperature is achievable (assuming 10-9 BER). The frequency response is typically dc to 125 MHz. Although the HFBR-24X6 is an analog receiver, it is compatible with digital systems. Please refer to Application Bulletin 78 for simple and inexpensive circuits that operate at 155 MBd or higher. The recommended ac coupled receiver circuit is shown in Figure 12. It is essential that a 10 ohm resistor be connected between pin 6 and the power supply, and a 0.1 µF ceramic bypass capacitor be connected between the power supply and ground. In addition, pin 6 should be filtered to protect the Figure 11. Simplified Schematic Diagram. Housed Product Unhoused Product receiver from noisy host systems. Refer to AN 1038, 1065, or AB 78 for details. CAUTION: The small junction sizes inherent to the design of these components increase the components’ susceptibility to damage from electrostatic discharge (ESD). It is advised that normal static precautions be taken in handling and assembly of these components to prevent damage and/or degradation which may be induced by ESD. PIN FUNCTION 1 2* 3 4* SIGNAL VEE VCC VEE 8 1 3 5 2 4 6 7 PIN NO. 1 INDICATOR BOTTOM VIEW 6 2 3, 7 VCC ANALOG SIGNAL VEE PIN FUNCTION 1† 2 3* 4† 5† 6 7* 8† * PINS 3 AND 7 ARE ELECTRICALLY CONNECTED TO THE HEADER. † PINS 1, 4, 5, AND 8 ARE ISOLATED FROM THE INTERNAL CIRCUITRY, BUT ARE ELECTRICALLY CONNECTED TO EACH OTHER. N.C. SIGNAL V N.C. N.C. V V N.C. EE CC EE BIAS & FILTER CIRCUITS VCC VOUT VEE 6 2 3, 7 POSITIVE SUPPLY ANALOG SIGNAL NEGATIVE SUPPLY 5.0 mA 300 pF |
Similar Part No. - HFBR-0400 |
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Similar Description - HFBR-0400 |
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