125 Megabaud Versatile Link The Versatile Fiber Optic Connection Technical Data Features • Data Transmission at Signal Rates of 1 to 125 MBd over Distances of 100 Meters • Compatible with Inexpensive, Easily Terminated Plastic Optical Fiber, and with Large Core Silica Fiber • High Voltage Isolation • Transmitter and Receiver Application Circuit Schematics and Recommended Board Layouts Available • Interlocking Feature for Single Channel or Duplex Links, in a Vertical or Horizontal Mount Configuration Applications • Intra-System Links: Boardto-Board, Rack-to-Rack • Telecommunications Switching Systems • Computer-to-Peripheral Data Links, PC Bus Extension • Industrial Control • Proprietary LANs • Digitized Video • Medical Instruments HFBR-0507 Series HFBR-15X7 Transmitters HFBR-25X6 Receivers • Reduction of Lightning and Voltage Transient Susceptibility Description The 125 MBd Versatile Link (HFBR-0507 Series) is the most cost-effective fiber-optic solution for transmission of 125 MBd data over 100 meters. The data link consists of a 650 nm LED transmitter, HFBR-15X7, and a PIN/preamp receiver, HFBR25X6. These can be used with low-cost plastic or silica fiber. One mm diameter plastic fiber provides the lowest cost solution for distances under 25 meters. The lower attenuation of silica fiber allows data transmission over longer distance, for a small difference in cost. These components can be used for high speed data links without the problems common with copper wire solutions, at a competitive cost. The HFBR-15X7 transmitter is a high power 650 nm LED in a low cost plastic housing designed to efficiently couple power into 1 mm diameter plastic optical fiber HCS® is a registered trademark of Spectran Corporation. Powered by ICminer.com Electronic-Library Service CopyRight 2003 and 200 µm Hard Clad Silica (HCS®) fiber. With the recommended drive circuit, the LED operates at speeds from 1-125 MBd. The HFBR-25X6 is a high bandwidth analog receiver containing a PIN photodiode and internal transimpedance amplifier. With the recommended application circuit for 125 MBd operation, the performance of the complete data link is specified for of 0-25 meters with plastic fiber and 0-100 meters with 200 µm HCS® fiber. A wide variety of other digitizing circuits can be combined with the HFBR-0507 Series to optimize performance and cost at higher and lower data rates. 2 HFBR-0507 Series 125 MBd Data Link Data link operating conditions and performance are specified for the HFBR-15X7 transmitter and HFBR-25X6 receiver in the recommended applications circuits shown in Figure 1. This circuit has been optimized for 125 MBd operation. The Applications Engineering Department in the Agilent Optical Communication Division is available to assist in optimizing link performance for higher or lower speed operation. Recommended Operating Conditions for the Circuits in Figures 1 and 2. Parameter Ambient Temperature Symbol TA Min. 0 Max. 70 Unit °C Supply Voltage Data Input Voltage – Low VCC VIL +4.75 VCC -1.89 +5.25 VCC -1.62 V V Data Input Voltage – High Data Output Load Signaling Rate VIH RL fS VCC -1.06 45 1 VCC -0.70 55 125 V Ω MBd Note 1 D.C. 40 60 % Note 2 Duty Cycle Reference Link Performance: 1-125 MBd, BER ≤ 10-9, under recommended operating conditions with recommended transmit and receive application circuits. Symbol OPBPOF Min.[3] 11 Optical Power Margin, 20 m Standard POF Link Distance with Standard 1 mm POF OPMPOF,20 3 6 dB l 20 27 m Optical Power Margin, 25 m Low Loss POF Link Distance with Extra Low Loss 1 mm POF OPMPOF,25 3 6 dB l 25 32 m Optical Power Budget, 1 m HCS Optical Power Margin, 100 m HCS OPBHCS OPMHCS,100 7 3 12 6 dB dB l 100 125 m Parameter Optical Power Budget, 1 m POF Link Distance with HCS Cable Typ.[4] Max. 16 Unit dB Condition Reference Note 5,6,7 Note 5,6,7 Note 5,6,7 Note 5,6,7 Note 5,6,7 Notes: 1. If the output of U4C in Figure 1, page 4 is transmitted via coaxial cable, terminate with a 50 Ω resistor to VCC - 2 V. 2. Run length limited code with maximum run length of 10 µs. 3. Minimum link performance is projected based on the worst case specifications of the HFBR-15X7 transmitter, HFBR-25X6 receiver, and POF cable, and the typical performance of other components (e.g. logic gates, transistors, resistors, capacitors, quantizer, HCS cable). 4. Typical performance is at 25°C, 125 MBd, and is measured with typical values of all circuit components. 5. Standard cable is HFBR-RXXYYY plastic optical fiber , with a maximum attenuation of 0.24 dB/m at 650 nm and NA = 0.5. Extra low loss cable is HFBR-EXXYYY plastic optical fiber, with a maximum attenuation of 0.19 dB/m at 650 nm and NA = 0.5. HCS cable is HFBR-H/VXXYYY glass optical fiber, with a maximum attenuation of 10 dB/km at 650 nm and NA = 0.37. 6. Optical Power Budget is the difference between the transmitter output power and the receiver sensitivity, measured after 1 meter of fiber. The minimum OPB is based on the limits of optical component performance over temperature, process, and recommended power supply variation. 7. The Optical Power Margin is the available OPB after including the effects of attenuation and modal dispersion for the minimum link distance: OPM = OPB - (attenuation power loss + modal dispersion power penalty). The minimum OPM is the margin available for longterm LED LOP degradation and additional fixed passive losses (such as in-line connectors) in addition to the minimum specified distance. Powered by ICminer.com Electronic-Library Service CopyRight 2003 3 Plastic Optical Fiber (1 mm POF) Transmitter Application Circuit: Performance of the HFBR-15X7 transmitter in the recommended application circuit (Figure 1) for POF; 1125 MBd, 25°C. Parameter Average Optical Power 1 mm POF Average Modulated Power 1 mm POF Optical Rise Time (10% to 90%) Optical Fall Time (90% to 10%) High Level LED Current (On) Low Level LED Current (Off) Optical Overshoot - 1 mm POF Transmitter Application Circuit Current Consumption - 1 mm POF Symbol Pavg Typical -9.7 Unit dBm Pmod tr -11.3 2.1 dBm ns tf IF,H IF,L 2.8 19 3 ns mA mA ICC 45 110 % mA Condition 50% Duty Cycle Note Note 1, Fig 3 Note 2, Fig 3 5 MHz 5 MHz Note 3 Note 3 Figure 1 Hard Clad Silica Fiber (200 µm HCS) Transmitter Application Circuit: Performance of the HFBR-15X7 transmitter in the recommended application circuit (Figure 1) for HCS; 1-125 MBd, 25°C. Parameter Average Optical Power 200 µm HCS Symbol Pavg Typical -14.6 Unit dBm Average Modulated Power 200 µm HCS Optical Rise Time (10% to 90%) Pmod tr -16.2 3.1 dBm ns Optical Fall Time (90% to 10%) High Level LED Current (On) Low Level LED Current (Off) tf IF,H IF,L 3.4 60 6 ns mA mA ICC 30 130 % mA Optical Overshoot - 200 µm HCS Transmitter Application Circuit Current Consumption - 200 µm HCS Condition 50% Duty Cycle Note Note 1, Fig 3 Note 2, Fig 3 5 MHz 5 MHz Note 3 Note 3 Figure 1 Notes: 1. Average optical power is measured with an average power meter at 50% duty cycle, after 1 meter of fiber. 2. To allow the LED to switch at high speeds, the recommended drive circuit modulates LED light output between two non-zero power levels. The modulated (useful) power is the difference between the high and low level of light output power (transmitted) or input power (received), which can be measured with an average power meter as a function of duty cycle (see Figure 3). Average Modulated Power is defined as one half the slope of the average power versus duty cycle: [Pavg @ 80% duty cycle - Pavg @ 20% duty cycle] Average Modulated Power = ––—————————————————————— (2) [0.80 - 0.20] 3. High and low level LED currents refer to the current through the HFBR-15X7 LED. The low level LED “off” current, sometimes referred to as “hold-on” current, is prebias supplied to the LED during the off state to facilitate fast switching speeds. Powered by ICminer.com Electronic-Library Service CopyRight 2003 4 Plastic and Hard Clad Silica Optical Fiber Receiver Application Circuit: Performance[4] of the HFBR-25X6 receiver in the recommended application circuit (Figure 1); 1-125 MBd, 25°C unless otherwise stated. Parameter Data Output Voltage - Low Data Output Voltage - High Receiver Sensitivity to Average Modulated Optical Power 1 mm POF Receiver Sensitivity to Average Modulated Optical Power 200 µm HCS Receiver Overdrive Level of Average Modulated Optical Power 1 mm POF Receiver Overdrive Level of Average Modulated Optical Power 200 µm HCS Receiver Application Circuit Current Consumption Symbol VOL VOH Pmin Typical VCC -1.7 VCC -0.9 -27.5 Unit V V dBm Condition RL = 50 Ω RL = 50 Ω 50% eye opening Note Note 5 Note 5 Note 2 Pmin -28.5 dBm 50% eye opening Note 2 Pmax -7.5 dBm 50% eye opening Note 2 Pmax -10.5 dBm 50% eye opening Note 2 ICC 85 mA RL = ∞ Figure 1 Notes: 4. Performance in response to a signal from the HFBR-15X7 transmitter driven with the recommended circuit at 1-125 MBd over 1 meter of HFBR-R/EXXYYY plastic optical fiber or 1 meter of HFBR-H/VXXYYY hard clad silica optical fiber. 5. Terminated through a 50 Ω resistor to VCC - 2 V. 6. If there is no input optical power to the receiver, electrical noise can result in false triggering of the receiver. In typical applications, data encoding and error detection prevent random triggering from being interpreted as valid data. Refer to Applications Note 1066 for design guidelines. L1 CB70-1812 C1 0.001 VCC C2 0.1 R5 22 14 9 10 U1C C3 0.1 C4 0.001 C5 10 + 7 74ACTQ00 Q1 BFQ52 R6 91 9 8 7 6 5 4 3 2 J1 1 TX VEE Q2 BASE Q1 BASE TX VCC RX VCC NC PIN 19 10H116 PIN 18 10H116 RX VEE Q2 BFQ52 1 2 12 13 U1D 3 U1A + C7 0.001 1 2 3 4 R8* 11 8 U2 5 HFBR-15X7 Q3 2N3904 74ACTQ00 R9* 74ACTQ00 R7 91 4 5 U1B 6 C19 0.1 VCC VBB R10 15 C8* 74ACTQ00 C20 10 C6 0.1 8 R12 4.7 C10 0.1 R11* ALL CAPACITOR VALUES ARE IN MICRO FARADS, WITH 10% TOLERANCE (UNLESS OTHERWISE NOTED). C9 .47 3V R24 1K C17 0.1 R22 1K R18 51 C16 0.1 MC10H116FN 18 19 U4C 15 17 C15 0.1 R25 1K R23 1K VBB C18 0.1 R13 4.7 R16 51 MC10H116FN 4 10 7 3 U4A 5 R19 51 20 MC10H116FN 9 14 13 8 U4B 12 R17 51 2 ALL RESISTANCES ARE IN OHMS WITH 5% TOLERANCE (UNLESS OTHERWISE NOTED). VBB R14 1K 8 C12 0.1 R15 1K C11 0.1 1 2 3 4 U3 5 HFBR-25X6 3V VCC R20 12 R21 62 VBB + C14 10 U5 C13 0.1 TL431 THE VALUES OF R8, R9, R11, AND C8 ARE DIFFERENT FOR POF AND HCS DRIVE CIRCUITS. R8 R9 R11 C8 POF HCS TOLERANCE 300 82 1% 300 82 1% 1K 470 1% 43 pF 120 pF 1% 5 Figure 1. Transmitter and Receiver Application Circuit with +5 V ECL Inputs and Outputs. Powered by ICminer.com Electronic-Library Service CopyRight 2003 5 120 Ω 120 Ω +5 V ECL SERIAL DATA SOURCE 82 Ω 0.1 µF 9 TX VEE 82 Ω 8 TD + 5V 7 TD – 4.7 µH + 10 µF 6 TX VCC 0.1 µF 0.1 µF 5 RX VCC 82 Ω 0.1 µF 10 µF 82 Ω + 4 4.7 µH FIBER-OPTIC TRANSCEIVER SHOWN IN FIGURE 1 3 RD +5 V ECL SERIAL DATA RECEIVER 2 RD 120 Ω 120 Ω 1 RX VEE 4.7 µH Figure 2. Recommended Power Supply Filter and +5 V ECL Signal Terminations for the Transmitter and Receiver Application Circuit of Figure 1. 21 200 OPTICAL POWER BUDGET –dB AVERAGE POWER – µW POF 150 100 AVERAGE MODULATED POWER 50 AVERAGE POWER, 50% DUTY CYCLE 20 40 60 80 100 15 HCS 13 11 30 50 70 90 110 130 DATA RATE – MBd DUTY CYCLE – % Figure 3. Average Modulated Power. 17 9 10 0 0 19 Figure 4. Typical Optical Power Budget vs. Data Rate. Powered by ICminer.com Electronic-Library Service CopyRight 2003 150 6 125 Megabaud Versatile Link Transmitter HFBR-15X7 Series Description The HFBR-15X7 transmitters incorporate a 650 nanometer LED in a horizontal (HFBR-1527) or vertical (HFBR-1537) gray housing. The HFBR-15X7 transmitters are suitable for use with current peaking to decrease response time and can be used with HFBR-25X6 receivers in data links operating at signal rates from 1 to 125 megabaud over 1 mm diameter plastic optical fiber or 200 µm diameter hard clad silica glass optical fiber. Refer to Application Note 1066 for details for recommended interface circuits. GROUND ANODE CATHODE GROUND GROUND 1 2 3 4 GROUND SEE NOTE 6 Absolute Maximum Ratings Parameter Storage Temperature Operating Temperature Lead Soldering Temperature Cycle Time Transmitter High Level Forward Input Current Transmitter Average Forward Input Current Reverse Input Voltage Symbol TS Min. -40 Max. 85 Unit °C TO -40 70 260 °C °C IF,H 10 120 s mA IF,AV 60 mA VR 3 V Reference Note 1 50% Duty Cycle ≥ 1 MHz CAUTION: The small junction sizes inherent to the design of this component increase the component's susceptibility to damage from electrostatic discharge (ESD). It is advised that normal static precautions be taken in handling and assembly of this component to prevent damage and/or degradation which may be induced by ESD. WARNING: WHEN VIEWED UNDER SOME CONDITIONS, THE OPTICAL PORT MAY EXPOSE THE EYE BEYOND THE MAXIMUM PERMISSIBLE EXPOSURE RECOMMENDED IN ANSI Z136.2, 1993. UNDER MOST VIEWING CONDITIONS THERE IS NO EYE HAZARD. Powered by ICminer.com Electronic-Library Service CopyRight 2003 7 Electrical/Optical Characteristics 0 to 70°C, unless otherwise stated. Parameter Symbol Min. Typ.[2] Max. Unit Condition Note Transmitter Output Optical Power, 1 mm POF PT -9.5 -10.4 -7.0 -4.8 -4.3 dBm IF,dc = 20 mA, 25°C 0-70°C Note 3 Transmitter Output Optical Power, 1 mm POF PT -6.0 -6.9 -3.0 -0.5 -0.0 dBm IF,dc = 60 mA, 25°C 0-70°C Note 3 Transmitter Output Optical Power, 200 µm HCS® PT -14.6 -15.5 -13.0 -10.5 -10.0 dBm IF,dc = 60 mA, 25°C 0-70°C Note 3 Output Optical Power Temperature Coefficient ∆PT ∆T Peak Emission Wavelength λPK Peak Wavelength Temperature Coefficient ∆λ ∆T 0.12 nm/°C FWHM 21 nm Spectral Width -0.02 640 1.8 650 2.1 dB/°C 660 2.4 nm V Full Width, Half Maximum IF = 60 mA Forward Voltage VF Forward Voltage Temperature Coefficient Transmitter Numerical Aperture Thermal Resistance, Junction to Case ∆VF ∆T NA -1.8 θjc 140 °C/W Reverse Input Breakdown Voltage VBR 13 V IF,dc = -10 µA Diode Capacitance CO 60 pF VF = 0 V, f = 1 MHz Unpeaked Optical Rise Time, 10% - 90% tr 12 ns IF = 60 mA f = 100 kHz Figure 1 Note 5 Unpeaked Optical Fall Time, 90% - 10% tf 9 ns IF = 60 mA f = 100 kHz Figure 1 Note 5 mV/°C 0.5 3.0 Note 4 Notes: 1. 1.6 mm below seating plane. 2. Typical data is at 25°C. 3. Optical Power measured at the end of 0.5 meter of 1 mm diameter plastic or 200 µm diameter hard clad silica optical fiber with a large area detector. 4. Typical value measured from junction to PC board solder joint for horizontal mount package, HFBR-1527. θ jc is approximately 30°C/W higher for vertical mount package, HFBR-1537. 5. Optical rise and fall times can be reduced with the appropriate driver circuit; refer to Application Note 1066. 6. Pins 5 and 8 are primarily for mounting and retaining purposes, but are electrically connected; pins 3 and 4 are electrically unconnected. It is recommended that pins 3, 4, 5, and 8 all be connected to ground to reduce coupling of electrical noise. 7. Refer to the Versatile Link Family Fiber Optic Cable and Connectors Technical Data Sheet for cable connector options for 1 mm plastic optical fiber and 200 µm HCS fiber. 8. The LED current peaking necessary for high frequency circuit design contributes to electromagnetic interference (EMI). Care must be taken in circuit board layout to minimize emissions for compliance with governmental EMI emissions regulations. Refer to Application Note 1066 for design guidelines. Powered by ICminer.com Electronic-Library Service CopyRight 2003 8 BCP MODEL 300 500 MHz BANDWIDTH SILICON AVALANCHE PHOTODIODE HP54002A 50 OHM BNC INPUT POD 50 OHM LOAD RESISTOR HP54100A OSCILLOSCOPE NORMALIZED SPECTRAL OUTPUT POWER 1.2 HP8082A PULSE GENERATOR 0° C 1.0 25° C 0.8 70° C 0.6 0.4 0.2 0 620 630 640 650 660 670 680 WAVELENGTH (nm) Figure 1. Test Circuit for Measuring Unpeaked Rise and Fall Times. Figure 2. Typical Spectra Normalized to the 25°C Peak. 0 PT – NORMALIZED OUTPUT POWER – dB VF – FORWARD VOLTAGE – V 2.4 0° C 2.2 25° C 70° C 2.0 1.8 1.6 1 10 100 IF,DC – TRANSMITTER DRIVE CURRENT (mA) Figure 3. Typical Forward Voltage vs. Drive Current. Powered by ICminer.com Electronic-Library Service CopyRight 2003 -5 0° C -10 -15 25° C 70° C -20 -25 1 10 100 IF,DC – TRANSMITTER DRIVE CURRENT (mA) Figure 4. Typical Normalized Output Optical Power vs. Drive Current. 9 125 Megabaud Versatile Link Receiver HFBR-25X6 Series Description The HFBR-25X6 receivers contain a PIN photodiode and transimpedance pre-amplifier circuit in a horizontal (HFBR2526) or vertical (HFBR-2536) blue housing, and are designed to interface to 1mm diameter plastic optical fiber or 200 µm hard clad silica glass optical fiber. The receivers convert a received optical signal to an analog output voltage. Follow-on circuitry can optimize link performance for a variety of distance and data rate requirements. Electrical bandwidth greater than 65 MHz allows design of high speed data links with plastic or hard clad silica optical fiber. Refer to Application Note 1066 for details for recommended interface circuits. GROUND 4 3 2 1 VCC GROUND GROUND SIGNAL GROUND SEE NOTES 2, 4, 9 Absolute Maximum Ratings Parameter Symbol Min. Max. Unit Storage Temperature TS -40 +75 °C Operating Temperature TA 0 +70 °C 260 °C 10 VCC 6.0 s V V 25 mA Lead Soldering Temperature Cycle Time Signal Pin Voltage Supply Voltage Output Current VO VCC IO -0.5 -0.5 Reference Note 1 CAUTION: The small junction sizes inherent to the design of this component increase the component's susceptibility to damage from electrostatic discharge (ESD). It is advised that normal static precautions be taken in handling and assembly of this component to prevent damage and/or degradation which may be induced by ESD. Powered by ICminer.com Electronic-Library Service CopyRight 2003 10 Electrical/Optical Characteristics 0 to 70°C; 5.25 V ≥ VCC ≥ 4.75 V; power supply must be filtered (see Figure 1, Note 2). Parameter Symbol Min. Typ. Max. Unit Test Condition Note AC Responsivity 1 mm POF RP,APF 1.7 3.9 6.5 mV/µW 650 nm Note 4 AC Responsivity 200 µm HCS RP,HCS 4.5 7.9 11.5 mV/µW VNO 0.46 0.69 mVRMS Note 5 PN,RMS - 39 -36 dBm Note 5 PN,RMS -42 -40 dBm Note 5 -5.8 dBm 5 ns PWD -6.4 dBm 2 ns PWD -8.8 dBm 5 ns PWD Note 6 -9.4 dBm Ω 2 ns PWD 50 MHz Note 4 V mA MHz PR = 0 µW RMS Output Noise Equivalent Optical Noise Input Power, RMS - 1 mm POF Equivalent Optical Noise Input Power, RMS - 200 µm HCS Peak Input Optical Power 1 mm POF PR Peak Input Optical Power 200 µm HCS PR Output Impedance DC Output Voltage Supply Current Electrical Bandwidth Bandwidth * Rise Time Electrical Rise Time, 10-90% Electrical Fall Time, 90-10% Pulse Width Distortion ZO VO ICC BWE 30 0.8 65 1.8 9 125 2.6 15 tr 0.41 3.3 6.3 Hz * s ns tf 3.3 6.3 ns PWD 0.4 1.0 ns Overshoot 4 % Note 6 -3 dB electrical PR = -10 dBm peak PR = -10 dBm peak PR = -10 dBm peak PR = -10 dBm peak Note 7 Note 8 Notes: 1. 1.6 mm below seating plane. 2. The signal output is an emitter follower, which does not reject noise in the power supply. The power supply must be filtered as in Figure 1. 3. Typical data are at 25°C and VCC = +5 Vdc. 4. Pin 1 should be ac coupled to a load ≥ 510 Ω with load capacitance less than 5 pF. 5. Measured with a 3 pole Bessel filter with a 75 MHz, -3dB bandwidth. 6. The maximum Peak Input Optical Power is the level at which the Pulse Width Distortion is guaranteed to be less than the PWD listed under Test Condition. PR,Max is given for PWD = 5 ns for designing links at ≤ 50 MBd operation, and also for PWD = 2 ns for designing links up to 125 MBd (for both POF and HCS input conditions). 7. 10 ns pulse width, 50% duty cycle, at the 50% amplitude point of the waveform. 8. Percent overshoot is defined at: (VPK - V100%) –––––––––––– × 100% V100% 9. Pins 5 and 8 are primarily for mounting and retaining purposes, but are electrically connected. It is recommended that these pins be connected to ground to reduce coupling of electrical noise. 10. If there is no input optical power to the receiver (no transmitted signal) electrical noise can result in false triggering of the receiver. In typical applications, data encoding and error detection prevent random triggering from being interpreted as valid data. Refer to Application Note 1066 for design guidelines. Powered by ICminer.com Electronic-Library Service CopyRight 2003 11 Figure 1. Recommended Power Supply Filter Circuit. Figure 2. Simplified Receiver Schematic. Figure 3. Typical Pulse Width Distortion vs. Peak Input Power. Figure 4. Typical Output Spectral Noise Density vs. Frequency. Powered by ICminer.com Electronic-Library Service CopyRight 2003 Figure 5. Typical Rise and Fall Time vs. Temperature.. Versatile Link Mechanical Dimensions HORIZONTAL MODULES HFBR-1527 HFBR-2526 HORIZONTAL MODULES HFBR-1537 HFBR-2526 Versatile Link Printed Circuit Board Layout Dimensions HFBR-15X7 www.semiconductor.agilent.com Data subject to change. Copyright © 1999 Agilent Technologies, Inc. Obsoletes 5962-9376E (4/94) 5965-6114E (11/99) Powered by ICminer.com Electronic-Library Service CopyRight 2003