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 Symbol Min. Max. Unit Storage Temperature Parameter TS -40 85 C Operating Temperature TO -40 70 C Lead Soldering Temperature 260 C Cycle Time Transmitter High Level Forward Input Current 10 s IF,H 120 mA Transmitter Average Forward Input Current IF,AV 60 mA VR 3 V Reverse Input Voltage 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. 3-29 Electrical/Optical Characteristics 0 to 70C, 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, 25C 0-70C 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, 25C 0-70C Note 3 Transmitter Output Optical Power, 200 m HCS(R) PT -14.6 -15.5 -13.0 -10.5 -10.0 dBm IF,dc = 60 mA, 25C 0-70C Note 3 Output Optical Power Temperature Coefficient PT T Peak Emission Wavelength PK Peak Wavelength Temperature Coefficient T 0.12 nm/C FWHM 21 nm Full Width, Half Maximum V IF = 60 mA Spectral Width Forward Voltage VF -0.02 640 1.8 650 2.1 dB/C 660 2.4 nm Forward Voltage Temperature Coefficient VF T -1.8 Transmitter Numerical Aperture NA 0.5 Thermal Resistance, Junction to Case jc 140 C/W Reverse Input Breakdown Voltage VBR 13 V IF,dc = -10 A 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 3.0 mV/C Note 4 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. 3-30 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 25C 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. -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. 3-31