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125 Megabaud Versatile Link The Versatile Fiber Optic Connection Technical Data
HFBR-0507 Series HFBR-15X7 Transmitters HFBR-25X6 Receivers
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
* 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
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
and 200 m Hard Clad Silica (HCS(R)) 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 m HCS(R) 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.
HCS(R) is a registered trademark of Spectran Corporation.
5965-6114E (1/97)
17
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 Hewlett-Packard 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 Supply Voltage Data Input Voltage - Low Data Input Voltage - High Data Output Load Signaling Rate Duty Cycle Symbol TA VCC VIL VIH RL fS D.C. Min. 0 +4.75 VCC -1.89 VCC -1.06 45 1 40 Max. 70 +5.25 VCC -1.62 VCC -0.70 55 125 60 Unit C V V V MBd % Note 2 Note 1 Reference
Link Performance: 1-125 MBd, BER 10-9, under recommended operating conditions with
recommended transmit and receive application circuits. Parameter Optical Power Budget, 1 m POF Optical Power Margin, 20 m Standard POF Link Distance with Standard 1 mm POF Optical Power Margin, 25 m Low Loss POF Link Distance with Extra Low Loss 1 mm POF Optical Power Budget, 1 m HCS Optical Power Margin, 100 m HCS Link Distance with HCS Cable Symbol OPBPOF OPMPOF,20 l OPMPOF,25 l OPBHCS OPMHCS,100 l Min.[3] 11 3 20 3 25 7 3 100 Typ.[4] Max. 16 6 27 6 32 12 6 125 Unit dB dB m dB m dB dB m Note 5,6,7 Note 5,6,7 Note 5,6,7 Condition Reference 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 resistor to VCC - 2 V. 2. Run length limited code with maximum run length of 10 s. 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 25C, 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.
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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, 25C. 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 ICC Symbol Pavg Pmod tr tf IF,H IF,L Typical -9.7 -11.3 2.1 2.8 19 3 45 110 Unit dBm dBm ns ns mA mA % mA Figure 1 5 MHz 5 MHz Note 3 Note 3 Condition 50% Duty Cycle Note Note 1, Fig 3 Note 2, Fig 3
Hard Clad Silica Fiber (200 m HCS) Transmitter Application Circuit: Performance of the HFBR-15X7 transmitter in the recommended application circuit (Figure 1) for HCS; 1-125 MBd, 25C.
Parameter Average Optical Power 200 m HCS Average Modulated Power 200 m HCS Optical Rise Time (10% to 90%) Optical Fall Time (90% to 10%) High Level LED Current (On) Low Level LED Current (Off) Optical Overshoot - 200 m HCS Transmitter Application Circuit Current Consumption - 200 m HCS ICC Symbol Pavg Pmod tr tf IF,H IF,L Typical -14.6 -16.2 3.1 3.4 60 6 30 130 Unit dBm dBm ns ns mA mA % mA Figure 1 5 MHz 5 MHz Note 3 Note 3 Condition 50% Duty Cycle Note Note 1, Fig 3 Note 2, Fig 3
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.
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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, 25C 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 m HCS Receiver Overdrive Level of Average Modulated Optical Power 1 mm POF Receiver Overdrive Level of Average Modulated Optical Power 200 m HCS Receiver Application Circuit Current Consumption Symbol VOL VOH Pmin Pmin Pmax Pmax ICC Typical VCC -1.7 VCC -0.9 -27.5 -28.5 -7.5 -10.5 85 Unit V V dBm dBm dBm dBm mA Condition RL = 50 RL = 50 50% eye opening 50% eye opening 50% eye opening 50% eye opening RL = Note Note 5 Note 5 Note 2 Note 2 Note 2 Note 2 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 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 R5 22 C2 0.1
VCC 14 9 10 U1C C3 0.1 8 R8* Q3 2N3904 1 2 3 4 C4 0.001 C5 10 + C6 0.1 C7 0.001
8 U2 5 HFBR-15X7
7 74ACTQ00 Q1 BFQ52 Q2 BFQ52 12 13 U1D U1A 3 11
1 2
R9*
74ACTQ00 4 5 U1B
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
R7 91
74ACTQ00 6 C8* R10 15 R11*
74ACTQ00
C20 10
+
C19 0.1 VBB 3V R22 1K R18 51 C16 0.1 MC10H116FN 4 10 7 3 U4A 5 20 2 C17 0.1 R16 51 MC10H116FN 9 14 13 8 U4B 12 R17 51 3V R20 12 VCC VBB VBB VCC C10 0.1
R12 4.7
C9 .47
ALL CAPACITOR VALUES ARE IN MICRO FARADS, WITH 10% TOLERANCE (UNLESS OTHERWISE NOTED). ALL RESISTANCES ARE IN OHMS WITH 5% TOLERANCE (UNLESS OTHERWISE NOTED). 8
R24 1K
R13 4.7 R14 1K
MC10H116FN 18 19 U4C 15 17 C15 0.1 R25 1K R23 1K VBB C18 0.1
C12 0.1 C11 0.1
R19 51
R15 1K
1 2 3 4
U3
5 HFBR-25X6
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%
R21 62
+ C14
10 U5 TL431
C13 0.1
Figure 1. Transmitter and Receiver Application Circuit with +5 V ECL Inputs and Outputs.
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120 +5 V ECL SERIAL DATA SOURCE 82 0.1 F + 5V - + 10 F 0.1 F 82 +5 V ECL SERIAL DATA RECEIVER 120 120 82 10 F + 0.1 F 4.7 H 4.7 H 0.1 F 82
120
9 TX VEE 8 TD 7 TD 6 TX VCC 5 RX VCC 4 3 RD 2 RD 4.7 H 1 RX VEE FIBER-OPTIC TRANSCEIVER SHOWN IN FIGURE 1
Figure 2. Recommended Power Supply Filter and +5 V ECL Signal Terminations for the Transmitter and Receiver Application Circuit of Figure 1.
200
21 POF
AVERAGE POWER - W
150
OPTICAL POWER BUDGET -dB
19
17
100 AVERAGE MODULATED POWER 50 AVERAGE POWER, 50% DUTY CYCLE 0 0 20 40 60 80 100 DUTY CYCLE - %
15 HCS
13
11
9 10
30
50
70
90
110
130
150
DATA RATE - MBd
Figure 3. Average Modulated Power.
Figure 4. Typical Optical Power Budget vs. Data Rate.
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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 m 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 IF,H IF,AV VR Symbol TS TO Min. -40 -40 Max. 85 70 260 10 120 60 3 Unit C C C s mA mA V 50% Duty Cycle 1 MHz Note 1 Reference
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.
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Electrical/Optical Characteristics 0 to 70C, unless otherwise stated.
Parameter Transmitter Output Optical Power, 1 mm POF Transmitter Output Optical Power, 1 mm POF Transmitter Output Optical Power, 200 m HCS(R) Output Optical Power Temperature Coefficient Peak Emission Wavelength Peak Wavelength Temperature Coefficient Spectral Width Forward Voltage Forward Voltage Temperature Coefficient Transmitter Numerical Aperture Thermal Resistance, Junction to Case Reverse Input Breakdown Voltage Diode Capacitance Unpeaked Optical Rise Time, 10% - 90% Unpeaked Optical Fall Time, 90% - 10% Symbol PT PT PT Min. -9.5 -10.4 -6.0 -6.9 -14.6 -15.5 Typ.[2] -7.0 -3.0 -13.0 Max. -4.8 -4.3 -0.5 -0.0 -10.5 -10.0 Unit dBm dBm dBm Condition IF,dc = 20 mA, 25C 0-70C IF,dc = 60 mA, 25C 0-70C IF,dc = 60 mA, 25C 0-70C Note Note 3 Note 3 Note 3
PT T PK T FWHM VF VF T NA jc VBR CO tr tf 3.0 1.8 640
-0.02 650 0.12 21 2.1 -1.8 0.5 140 13 60 12 9 2.4 660
dB/C nm nm/C nm V mV/C Full Width, Half Maximum IF = 60 mA
C/W V pF ns ns IF,dc = -10 A VF = 0 V, f = 1 MHz IF = 60 mA f = 100 kHz IF = 60 mA f = 100 kHz
Note 4
Figure 1 Note 5 Figure 1 Note 5
Notes: 1. 1.6 mm below seating plane. 2. Typical data is at 25C. 3. Optical Power measured at the end of 0.5 meter of 1 mm diameter plastic or 200 m 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. jc is approximately 30C/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 m 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.
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1.2
HP8082A PULSE GENERATOR
NORMALIZED SPECTRAL OUTPUT POWER
0 C 1.0 25 C 0.8 70 C 0.6
BCP MODEL 300 500 MHz BANDWIDTH SILICON AVALANCHE PHOTODIODE
50 OHM LOAD RESISTOR
HP54002A 50 OHM BNC INPUT POD
HP54100A OSCILLOSCOPE
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 25C Peak.
2.4
0
VF - FORWARD VOLTAGE - V
0 C 2.2 25 C 70 C 2.0
PT - NORMALIZED OUTPUT POWER - dB
-5 0 C -10
-15 25 C -20 70 C
1.8
1.6 1 10 100 IF,DC - TRANSMITTER DRIVE CURRENT (mA)
-25 1 10 100 IF,DC - TRANSMITTER DRIVE CURRENT (mA)
Figure 3. Typical Forward Voltage vs. Drive Current.
Figure 4. Typical Normalized Output Optical Power vs. Drive Current.
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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 m 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 GROUND SEE NOTES 2, 4, 9 VCC GROUND GROUND SIGNAL
Absolute Maximum Ratings
Parameter Storage Temperature Operating Temperature Lead Soldering Temperature Cycle Time Signal Pin Voltage Supply Voltage Output Current VO VCC IO -0.5 -0.5 Symbol TS TA Min. -40 0 Max. +75 +70 260 10 VCC 6.0 25 Unit C C C s V V mA Note 1 Reference
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.
25
Electrical/Optical Characteristics 0 to 70C; 5.25 V VCC 4.75 V; power supply must be filtered
(see Figure 1, Note 2). Parameter AC Responsivity 1 mm POF AC Responsivity 200 m HCS RMS Output Noise Equivalent Optical Noise Input Power, RMS - 1 mm POF Equivalent Optical Noise Input Power, RMS - 200 m HCS Peak Input Optical Power 1 mm POF Peak Input Optical Power 200 m HCS 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 Overshoot tr tf PWD Symbol RP,APF RP,HCS VNO PN,RMS PN,RMS PR Min. 1.7 4.5 Typ. 3.9 7.9 0.46 - 39 -42 Max. 6.5 11.5 0.69 -36 -40 -5.8 -6.4 PR -8.8 -9.4 ZO VO ICC BWE 65 0.8 30 1.8 9 125 0.41 3.3 3.3 0.4 4 6.3 6.3 1.0 2.6 15 Unit mV/W mV/W mVRMS dBm dBm dBm dBm dBm dBm V mA MHz Hz * s ns ns ns % PR = -10 dBm peak PR = -10 dBm peak PR = -10 dBm peak PR = -10 dBm peak Note 7 Note 8 -3 dB electrical 5 ns PWD 2 ns PWD 5 ns PWD 2 ns PWD 50 MHz PR = 0 W Note 4 Note 6 Note 5 Note 5 Note 5 Note 6 Test Condition 650 nm Note Note 4
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 25C and VCC = +5 Vdc. 4. Pin 1 should be ac coupled to a load 510 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%) ------------ x 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.
26
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.
Figure 5. Typical Rise and Fall Time vs. Temperature..
27
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
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