AFBR-2418Z

The component is designed to provide cost effective, high performance fiber optic communication links for information systems and industrial applications with link distances to 2 km. The receivers are directly compatible with popular "industry-standard" connectors: ST and SMA. They are designed for use with 62.5/125 m, and 200 m multimode fiber.

RoHS-compliant Work with Avago HFBR-14xxZ (820nm LED) transmitter Data transmission at signal rates from to 50 MBd Receiver: Integrated PIN diode and digitalizing IC with CMOS/TTL output logic 2 km distance with Multimode Glass Fiber Cable Operating temperature range 3.3 V and 5 V supply voltage operation RSSI output

Receiver with SMA port Receiver with ST port Receiver with threaded ST port Receiver with metal ST port

Optical transmission from to 50 MBd Industrial control and factory automation High voltage isolation Elimination of ground loops Transmitter

Note: Verified with PRBS7 pattern using HFBR-1414Z transmitter, respecting its worst case LOP conditions but assuming a proper fiber connection (direct connection without add. connectors). Multiple or weak connections may reduce the achievable link length.

The receiver is housed in a low-cost, dual-inline package that is made of high strength, heat resistant, chemically resistant, and UL 94V-O flame retardant ULTEM� plastic (UL File #E121562). The receivers (suffix Z, TZ) are easily identified by the dark grey color connector port. A metal port option is also available (suffix MZ). The metal port option components have an internal electrical connection between the metal port and the four grounding pins, as shown in the package outline drawing. Signal ground is separate from the four grounding pins to give flexibility in connecting the port to signal or chassis ground. The package is designed for auto-insertion and wave soldering it is ideal for high volume production applications.

The AFBR-24x8xZ fiber optic receiver is designed to operate with the Avago Technologies HFBR-14xxZ fiber optic trans-mitters and multimode glass fiber cable. Consistent coupling into the receiver is assured by the optical system with lens. The receiver output is a digital CMOS/TTL signal. The AFBR-24x8xZ receiver contains an IC with integrated photodiode which directly converts the incoming optical signal to a digital output signal without the requisite for additional external circuitry. Because of its integrated design, the receiver has very high EMC resistance. A wide receiver dynamic range and high sensitivity over temperature is achievable. The data rate typically goes from 50MBd. A monitor (RSSI) output, which delivers an output current proportional to the average incoming light power, is available. For an almost noise-free RSSI-signal smoothing components are recommended. A capacitor in parallel to the resistor on the RSSI output reduces potential high frequency signal parts. The use of a single 100 nF capacitor for signal smoothing is sufficient in most common applications, as shown in the Recommended Receiver Circuitry section. If this RSSI function is not required, the output pin can be left floating. The RSSI-signal is derived from internal controlling loops; therefore, the typical time constant of pure RSSI output current without an external filter can to 1 ms. This time constant also depends on the actual average incoming light power.

Each part comes with a protective port cap or plug covering the optics. These caps/plugs will vary by port style. When soldering, it is advisable to leave the protective cap on the unit to keep the optics clean. Good system performance requires clean port optics and cable ferrules to avoid obstructing the optical path. Clean compressed air often is sufficient to remove particles of dirt; methanol on a cotton swab also works well.

Storage Temperature Operating Temperature Supply Voltage Maximum DC Output Current Voltage at RSSI Output Lead Soldering Cycle - Temp Lead Soldering Cycle - Time

Optical Input Peak Power Range (50 MBd proprietary) Optical Spectrum Range Data Rate Supply Voltage Supply Current High Level Output Voltage Low Level Output Voltage Output Rise Time (10-90%) Output Fall Time (90-10%) Pulse Width Distortion Pulse Width Distortion to 3rd pulse Propagation Delay RSSI Output Responsivity Voltage at RSSI Output

Notes: 1. Typical data are 25� C, VCC 2. In recommended receiver circuit, with an optical signal from the recommended transmitter circuit, transmitted via 62.5/125m MM fiber. 3. Condition for sensitivity limit: Total Jitter 0.6 UI (unit intervals). The sensitivity was characterized by usage of transmitter HFBR-1414Z, an optical attenuator for the particular power setting and a short piece of fiber (a few meters). The use of long fiber connections up to max. link length, as specified in the table "Link Length" on page 1, may reduce the sensitivity. 4. Verified with a PRBS7 signal with mark ratio = � running at 50 MBd (in this case, the optical input average power levels are 3dB less than the specified peak power levels). 5. Verified with an external resistor 6. If the data rate was below 1 MBd, the pulse width distortion would be equal to the pulse width distortion of the to 3rd pulses for higher data rates. 7. The threshold of the 1st pulse of a data sequence is difficult to adjust and therefore the pulse width distortion up to the 3rd pulse is higher than for all other pulses (worst case for the 1st pulse). This strongly depends on the quality of the rising and falling edge of the optical input. The faster the edges the smaller the pulse width variation. Furthermore lower data rates would result in the same issue as all the pulse become 1st pulses 8. The is an inverting receiver, hence a logic high at the input (light on) causes a logic low at the electrical data output. Respectively, a rising input edge causes a falling output edge and vice versa.

Note: To provide a suitable monitoring voltage, choose the value of RRSSI according to the particular optical power situation. For the characterization of the responsivity, 2 k was used. The lower the power, the higher the resistor value should be. Do not, however, override the max. limit of VRSSI.

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