AFBR-24x8xZ DC-50MBd Miniature Link Fiber Optic Receiver Data Sheet Description Features The component is designed to provide cost effective, high performance fiber optic communication links for information systems and industrial applications with link distances of up to 2 km. The receivers are directly compatible with popular "industry-standard" connectors: ST and SMA. They are designed for use with 50/125 m, 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 DC up to 50 MBd * Receiver: Integrated PIN diode and digitalizing IC with CMOS/TTL output logic * Up to 2 km distance with Multimode Glass Fiber Cable * Operating temperature range of -40C to +85C AFBR-24x8xZ Available Part Numbers * 3.3 V and 5 V supply voltage operation Part Number Description AFBR-2408Z Receiver with SMA port * RSSI output AFBR-2418Z Receiver with ST port Applications AFBR-2418TZ Receiver with threaded ST port AFBR-2418MZ Receiver with metal ST port * Optical transmission from DC up to 50 MBd * Industrial control and factory automation * High voltage isolation Link Length * Elimination of ground loops Data Rate (MBd) Max. Distance (m) Fiber Size (m) Transmitter * Reduces voltage transient susceptibility 50 900 50/125 HFBR-1414Z * Power substation automation 50 2000 62.5/125 HFBR-1414Z 50 100 200 HFBR-1414Z 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. Package and Handling Information AFBR-24x8xZ Low-Cost 50 MBd Receiver Package Information Description 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(R) 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 so 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 DC to 50MBd. A monitor (RSSI) output, which delivers an output current proportional to the average incoming light power, is available. Handling and Design Information 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. 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 be up to 1 ms. This time constant also depends on the actual average incoming light power. Absolute Maximum Ratings Parameter Symbol Min Max Unit Storage Temperature TS -40 +85 C Operating Temperature TA -40 +85 C Supply Voltage VCC -0.3 5.5 V Maximum DC Output Current IO 10 mA Voltage at RSSI Output VRSSI VCC+0.3 V Lead Soldering Cycle - Temp TSOLD 260 C Lead Soldering Cycle - Time tSOLD 10 s 2 -0.3 Notes 1.6 mm below seating plane Electrical/Optical Characteristics -40 C to +85 C, 3.135 V < VCC < 5.25 V Parameter Symbol Min Optical Input Peak Power Range (50 MBd proprietary) PIN-50 -24 Optical Spectrum Range IN 792 Data Rate DR Supply Voltage VCC Supply Current ICC High Level Output Voltage VOH Low Level Output Voltage VOL Output Rise Time (10-90%) Typ [1] Max Unit Condition Notes +1 dBm DR=50MBd 2, 3, 4 865 nm peak wavelength DC 50 MBd 3.135 5.25 V 20 30 mA RL=2k VCC-0.3 VCC V RL=2k 0.2 0.4 V RL=2k tR 5 ns CL=10pF 2, 4 Output Fall Time (90-10%) tF 5 ns CL=10pF 2, 4 Pulse Width Distortion PWD -4 +4 ns 4, 8 Pulse Width Distortion 1st to 3rd pulse PWDINIT -5 +8 ns 6, 7, 8 Propagation Delay tRD 40 ns 8 RSSI Output Responsivity IRSSI/PIN A/W 5 Voltage at RSSI Output VRSSI 820 2.4 0.72 0 VCC-1 V Notes: 1. Typical data are at 25 C, VCC = 5.0 V. 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 = 1/2 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 RRSSI=2 k 6. If the data rate was below 1 MBd, the pulse width distortion would be equal to the pulse width distortion of the 1st 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 AFBR-24x8xZ 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. 0.9 100 IRSSI/PIN - A/W VRSSI - mV 1 85C 25C -40C 1000 10 0.8 0.7 0.6 0.5 1 -30 -20 -10 PIN - OPTICAL INPUT POWER - dBm Figure 1. Typical RSSI output voltage across RRSSI = 2 k 0 0.4 -50 0 50 T - TEMPERATURE - C 100 Figure 2. Typical Responsivity vs. Temperature 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. 3 Pin Description Pin Name Function Notes 1 NC NC 1 2 /DO Data Out inverted (CMOS/TTL logic) 2 3 VCC 5V/3.3V Supply Voltage 4 NC NC 1 5 NC NC 1 6 RSSI Received Signal Strength Indicator Output 7 GND Ground 8 NC NC 4 3 2 1 5 6 7 8 PIN NO. 1 INDICATOR BOTTOM VIEW 1 Notes 1. Pins 1, 4, 5 and 8 are connected together internally. The metal port option components (suffix MZ) have an internal electrical connection between the metal port and the four grounding pins 2. The data output provides an inverted signal, thus an electrical low in case of light on and vice versa. RXVCC Recommended Circuitry 1 H L1 C1 C2 10 F 100 nF GND LL VCC RSSI DO GND PHY DO 1 4 5 8 Rx 3 6 2 7 C3 2k AFBR-24x8xZ RRSSI GND Monitoring VRSSI 100 nF GND GND GND GND Recommended Transmitter Driver Circuitry for AFBR-24x8xZ receivers using HFBR-14x4xxZ 2 12 Data 13 IC1D 11 4 5 9 10 4 IC1B 6 10 F 100 nF GND GND 2 6 7 3 HFBR-14x4xxZ AN2 AN6 AN7 CAT Tx LL C2 8 5 4 1 IC1A 3 C1 R2 R1 GND R3 1 C3 TXVCC = 5.0V IC1C 8 74ACTQ00MTC GND R1 R2 R3 C3 33 33 270 75 pF Mechanical Dimensions - SMA Port AFBR-2408Z 12.7 (0.50) AVAGO COUNTRY AFBR-2408Z RX YYWW 1/4 - 36 UNS 2A THREAD Note: Dimensions are in millimeters (inches). 22.2 (0.87) 6.35 (0.25) 12.7 (0.50) 6.4 (0.25) DIA. 3.81 (0.15) 5.1 (0.20) 10.2 (0.40) 1.27 (0.05) 2.54 (0.10) 4 5 2.54 (0.10) 2 3 7 6 PINS 1,4,5,8 0.51 X 0.38 (0.020 X 0.015) 3.6 (0.14) 1 8 PINS 2,3,6,7 0.46 DIA. (0.018) PIN NO. 1 INDICATOR Mechanical Dimensions - ST Port 12.7 (0.50) AVAGO COUNTRY AFBR-2418Z RX YYWW AFBR-2418Z 4.9 MAX. (0.193) Note: Dimensions are in millimeters (inches). 8.3 (0.32) 27.2 (1.07) 6.35 (0.25) 12.7 (0.50) 7.0 DIA. (0.28) 3.81 (0.15) 4 5 2 3 7 6 PINS 2,3,6,7 0.46 DIA. (0.018) PIN NO. 1 INDICATOR 5 5.1 (0.20) 1.27 (0.05) 2.54 (0.10) 1 8 PINS 1,4,5,8 0.51 x 0.38 (0.020 x 0.015) 2.54 (0.10) 3.6 (0.14) 10.2 (0.40) Mechanical Dimensions - Threaded ST Port AFBR-2418TZ 12.7 (0.50) 4.9 MAX. (0.193) AVAGO COUNTRY AFBR-2418TZ RX YYWW 5.1 (0.20) Note: Dimensions are in millimeters (inches). 8.4 (0.33) 27.2 (1.07) 7.6 (0.30) 6.35 (0.25) 12.7 (0.50) 7.1 DIA. (0.28) 3.6 (0.14) 10.2 (0.40) 5.1 (0.20) 3/8 - 32 UNEF - 2A 3.81 (0.15) 1.27 (0.05) 2.54 DIA. (0.10) 2.54 (0.10) 2 3 7 6 4 5 PINS 1,4,5,8 0.51 x 0.38 (0.020 x 0.015) 1 8 PINS 2,3,6,7 0.46 DIA. (0.018) PIN NO. 1 INDICATOR Mechanical Dimensions - Metal ST Port AFBR-2418MZ 4.9 MAX. (0.193) Note: Dimensions are in millimeters (inches). AVAGO COUNTRY AFBR-2418MZ RX YYWW 12.7 (0.50) 8.4 (0.33) 27.2 (1.07) 6.35 (0.25) 12.7 (0.50) 7.0 DIA. (0.28) 3.81 (0.15) 2.54 (0.10) 10.2 (0.40) 1.27 (0.05) 2.54 (0.10) 7 6 4 5 2 3 5.1 (0.20) 1 8 PINS 1,4,5,8 0.51 x 0.38 (0.020 x 0.015) PINS 2,3,6,7 0.46 DIA. (0.018) DIA. 3.6 (0.14) PIN NO. 1 INDICATOR For product information and a complete list of distributors, please go to our web site: www.avagotech.com Avago, Avago Technologies, and the A logo are trademarks of Avago Technologies in the United States and other countries. Data subject to change. Copyright (c) 2005-2013 Avago Technologies. All rights reserved. AV02-4303EN - October 11, 2013