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125 Megabaud Fiber Optic Transceiver JIS FO7 Connection Technical Data
HFBR-5527
Features
* Data Transmission at Signal Rates of 1 to 125 MBd over Distances up to 100 Meters * Compatible with Duplex JIS FO7 and Simplex JIS FO5 Connectors * Specified for Use with Plastic Optical Fiber (POF), and with Large Core Silica Fiber (HCS(R)) * Transmitter and Receiver Application Circuit Schematics Available * Conductive Plastic Housing Provides Electrical Shield
Description
The 125 MBd transceiver is a cost-effective fiber-optic solution for transmission of 125 MBd data up to 100 meters with HCS(R) fiber. The data link consists of a 650 nm visible, red LED transmitter and a PIN/preamp receiver. These can be used with low-cost plastic or hard clad silica fiber. One millimeter diameter plastic fiber provides the lowest cost solution for distances under 25 meters. The lower attenuation of HCS(R) fiber allows data transmission over longer distance. These components can be used for high speed data links without the problems common with copper wire solutions. The transmitter is a high power 650 nm LED. Both transmitter and receiver are molded in one housing which is compatible with the FO7 connector. This connector is designed to efficiently couple the power into POF or HCS(R) fiber.
Applications
* Intra-System Links: Boardto-Board, Rack-to-Rack * High Voltage Isolation * Telecommunications Switching Systems * Computer-to-Peripheral Data Links, PC Bus Extension * Industrial Control Networks * Proprietary LANs * Digitized Video * Medical Instruments * Immune to Lightning and Voltage Transients
With the recommended drive circuit, the LED operates at speeds from 1-125 MBd. The analog high bandwidth receiver contains 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 0-25 meters with plastic fiber. A wide variety of other digitizing circuits can be combined with the HFBR-5527 Series to optimize performance and cost at higher or lower data rates.
HCS(R) is a registered trademark of Spectran Corporation.
5965-7092E (5/97)
165
HFBR-5527 125 MBd Data Link
Data link operating conditions and performance are specified for the transmitter and 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
1 2
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 Min.[3] OPBPOF 11 OPMPOF,20 3 1 OPMPOF,25 1 OPBHCS OPMHCS,100 1 20 3 25 Typ.[4] 16 6 27 6 32 12 6 125 Max. Unit dB dB m dB m dB dB m 5, 6, 7 5, 6, 7 5, 6, 7 Condition Note 5, 6, 7 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 transmitter, 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 long term LED LOP degradation and additional fixed passive losses (such as in-line connectors) in addition to the minimum specified distance.
166
Plastic Optical Fiber (1 mm POF) Transmitter Application Circuit:
Performance of the transmitter in the recommended application circuit (Figure 1) for POF; 1-125 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 30 3 45 115 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 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 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.
167
Plastic and Hard Clad Silica Optical Fiber Receiver Application Circuit:
Performance[4] of the 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 transmitter driven with the recommended circuit at 1-125 MBd over 1 meter of plastic optical fiber or 1 meter of HCS(R) fiber with F07 plugs. 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.
L1 CB70-1812 C1 0.001 R5 22 C2 0.1
VCC 14 9 10 U1C C3 0.1 8 R8* Q3 2N3904 UNLESS OTHERWISE NOTED, ALL CAPACITOR VALUES ARE IN F WITH 10% TOLERANCE AND ALL RESISTOR VALUES ARE IN WITH 5% TOLERANCE. C4 0.001 C5 10 + C6 0.1 C7 0.001
7 74ACTQ00 Q1 MPS536L Q2 MPS536L 1 2 12 13 U1D U1A 3 11
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
10 1 2 3 4 5 RX OUT RX GND RX GND RX VCC GND 6 GND 7 ANODE 8 CATHODE 9 U22
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
THE VALUES OF R8, R9, R11, AND C8 ARE DIFFERENT FOR POF AND HCS DRIVE CIRCUITS. R8 R9 R11 C8 POF HCS TOLERANCE 180 82 1% 180 82 1% 820 470 1% 62 pF 120 pF 5%
R21 62
+ C14
10 U5 TL431
C13 0.1
RX GND
Figure 1. Transmitter and Receiver Application Circuit with +5 V ECL Inputs and Outputs.
168
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.
169
125 Megabaud Fiber Optic Link Transmitter/Receiver
CASE GND
10
Description
The HFBR-5527 incorporates a 650 nm LED, a PIN photodiode, and transimpedance preamplifier. The 650 nm LED is suitable for use with current peaking to decrease optical response time and can be used with the PIN preamplifier to build an optical transceiver that can be operated at signaling rates from 1 to 125 MBd over POF or HCS(R) 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.
RX OUT RX GND RX GND RX VCC GND GND ANODE CATHODE
1 2 3 4 5 6 7 8 9
CASE GND
Absolute Maximum Ratings
Parameter Storage Temperature Operating Temperature Lead Soldering Temperature Cycle Time Transmitter High Level Forward Input Current Transmitter Average Forward Input Current Transmitter Reverse Input Voltage Receiver Signal Pin Voltage Receiver Supply Voltage Receiver Output Current IF,H IF,AV VR VO VCC IO -0.5 -0.5 Symbol TS TO Min. -40 -40 Max. +85 +70 260 10 120 60 3 VCC 6.0 25 Unit C C C s mA mA V V V mA 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.
170
HFBR-5527 Transmitter Electrical/Optical Characteristics 0 to 70C, unless otherwise stated.
Parameter 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 T PK T FWHM VF VF T NA jc VBR CO tr tf 3.0 1.8 640 Min. -9.5 -10.4 Typ.[2] -7.0 -13.0 -0.02 650 0.12 21 2.0 -1.8 0.5 140 13 60 12 9 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 Figure 5 Note 5 Figure 5 Note 5 Note 4 2.4 660 Max. -4.8 -4.3 -10.5 -10.0 Unit dBm dBm dB/C nm nm/C nm V mV/C Full Width, Half Maximum IF = 60 mA Condition IF,dc = 30 mA, 25C 0-70C IF,dc = 60 mA, 25C 0-70C Note Note 3 Note 3
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. 5. Optical rise and fall times can be reduced with the appropriate driver circuit. 6. Pins 9 and 10 are primarily for mounting and retaining purposes, but are electrically connected with conductive housing; pins 5 and 6 are electrically unconnected. It is recommended that pins 5, 6, 9, and 10 all be connected to Rx 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.
171
1.2 NORMALIZED SPECTRAL OUTPUT POWER 0 C 1.0 25 C 0.8 70 C 0.6
HP8082A PULSE GENERATOR
BCP MODEL 300 500 MHz BANDWIDTH SILICON AVALANCHE PHOTODIODE
0.4
0.2
50 OHM LOAD RESISTOR
HP54002A HP54100A 50 OHM BNC OSCILLOSCOPE INPUT POD
0 620
630
640
650
660
670
680
WAVELENGTH (nm)
Figure 5. Test Circuit for Measuring Unpeaked Rise and Fall Times.
Figure 6. Typical Spectra Normalized to the 25C Peak.
2.4
PT - NORMALIZED OUTPUT POWER - dB
+5
VF - FORWARD VOLTAGE - V
0 C 2.2 25 C 70 C 2.0
0
-5
-10 25 C -15
1.8
1.6 1 10 100 IF,DC - TRANSMITTER DRIVE CURRENT (mA)
-20 1 10 50 100 IF,DC - TRANSMITTER DRIVE CURRENT (mA)
Figure 7. Typical Forward Voltage vs. Drive Current.
Figure 8. Typical Normalized Output Optical Power vs. Drive Current with the Drive Circuit in Figure 1 Recommended Application Circuit.
172
HFBR-5527 Receiver 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,POF RP,HCS VNO PN,RMS PN,RMS PR PR 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 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 -8.8 -9.4 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 5 Note 5 Note 5 Note 6 Note 6 Note 4 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 9. 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, -3 dB bandwidth. No modulation appled to Tx. 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 9 and 10 are primarily for mounting and retaining purposes, but are electrically connected with the conductive housing. Pins 5 and 6 are electrically unconnected. It is recommended that pins 5 and 6 be connected to Rx ground to reduce coupling of electrical noise. Refer to Figure 1. The connections between pins 1 and 2 of the HFBR-5527 and pins 13 and 12 of the MC10H116 should be adjacent and nearly the same length to maximize the common mode rejection of the MC10H116 to eliminate cross talk between the transmitter and receiver. 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.
173
VCC 4.7
0.1 F 4.7
0.47 F
4
RECEIVER 1
RX ANALOG OUTPUT
9
10
2.3
Figure 9. Recommended Power Supply Filter Circuit.
The HFBR-5527 is typically used to construct 125 MBd digital fiber-optic receivers which use the same +5 volt power supply that powers the host system's microprocessors, CMOS logic, or TTL logic. To build a digital receiver, the analog HFBR-5527 component must be connected to a post amplifier and a comparator. This post amplifier plus comparator function is commonly known as a quantizer. The 0 V common and +5 V power supply connections for the HFBR-5527 and quantizer must be isolated from the host system's power and ground planes by a low pass filter. This recommended low pass
filter assures that the electrical noise normally present in the host system's digital logic power supply will not reduce the sensitivity of fiber-optic receivers implemented with the HFBR-5527. The quantizer and power supply filter circuits recommended for use with the HFBR-5527 are shown in Figure 7 of HP Application Note 1066. For optimum performance, the HFBR-5527 should be used with the same quantizer and power supply filters recommended for use with HP's HFBR-15X7 and HFBR-25X6 components. To maximize immunity to electrical
noise, pins 3, 9, and 10 of the HFBR-5527 should be connected to filtered receiver common. For best common mode noise rejection, the connections between pins 1 and 2 of the HFBR-5527 and the quantizer's differential input should be of equal length, and the components in both traces should be placed to achieve symmetry. The preceding recommendations minimize the cross talk between the fiber-optic transmitter and receiver. These recommendations also improve the fiber-optic receiver's immunity to environmental noise and the host system's electrical noise.
174
BIAS & FILTER CIRCUITS
4
POSITIVE SUPPLY
900 pF
1
RX ANALOG OUTPUT
5.0 mA
2.3
GROUND
Figure 10. Simplified Receiver Schematic.
Figure 11. Typical Pulse Width Distortion vs. Peak Input Power.
Figure 12. Typical Output Spectral Noise Density vs. Frequency.
Figure 13. Typical Rise and Fall Time vs. Temperature.
175
HFBR-5527 Mechanical Dimensions
16
HFBR-5527 SINGAPORE hp XXXX
22
10.16
8.5 4.4 3.5 0.3 2.54 4.39 1 5.85 5.76 20 2.11
0.51
ALL DIMENSIONS IN MILLIMETERS (INCHES). ALL DIMENSIONS 0.25 mm UNLESS OTHERWISE SPECIFIED.
0.64
Printed Circuit Board Layout Dimensions
20.3 1.11 2.54 (0.100) 1.01 (0.040) DIA.
8
7
6
5
4
3
2
1
4.39
9
10
TOP VIEW ELECTRICAL PIN FUNCTIONS PIN NO. 1 2 3 4 5 6 7 8 9 10 RX OUT RX GND RX GND RX VCC TX GND* TX GND* ANODE CATHODE CASE GND CASE GND CAUTION: THIS PACKAGE IS MADE OF CONDUCTIVE PLASTIC. PLEASE TAKE THIS INTO ACCOUNT WHEN INCORPORATING THIS PACKAGE INTO INTRINSICALLY SAFE APPLICATIONS. NOTE: DIMENSIONS IN MILLIMETERS AND (INCHES).
*NO INTERNAL CONNECTION
176

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