
2
HFBR-0507Z Series
125 MBd Data Link
Data link operating conditions and performance are
speci ed for the HFBR-15X7Z transmitter and HFBR-25X6Z
receiver in the recommended applications circuits shown
in Figure 1. This circuit has been optimized for 125 MBd
operation. The Applications Engineer ing Department in
the Avago 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 Symbol Min. Max. Unit Reference
Ambient Temperature T
A 0 70 °C
Supply Voltage V
CC +4.75 +5.25 V
Data Input Voltage – Low VIL V
CC -1.89 VCC -1.62 V
Data Input Voltage – High V
IH V
CC -1.06 VCC -0.70 V
Data Output Load RL 45 55 Ω Note 1
Signaling Rate fS 1 125 MBd
Duty Cycle D.C. 40 60 % Note 2
Link Performance: 1-125 MBd, BER ≤ 10-9, under recommended operating conditions with recommended transmit
and receive application circuits.
Parameter Symbol Min.[3] Typ.[4] Max. Unit Condition Reference
Optical Power Budget, 1 m POF OPBPOF 11 16 dB Note 5,6,7
Optical Power Margin, OPMPOF,20 3 6 dB Note 5,6,7
20 m Standard POF
Link Distance with l 20 27 m
Standard 1 mm POF
Optical Power Margin, OPMPOF,25 3 6 dB Note 5,6,7
25 m Low Loss POF
Link Distance with Extra l 25 32 m
Low Loss 1 mm POF
Optical Power Budget, 1 m HCS OPBHCS 7 12 dB Note 5,6,7
Optical Power Margin, OPMHCS,100 3 6 dB Note 5,6,7
100 m HCS
Link Distance with HCS Cable l 100 125 m
Notes:
1. If the output of U4C in Figure 1, page 4 is transmitted via coaxial cable, terminate with a 50 Ω resistor to V
CC - 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 speci cations of the HFBR-15X7Z transmitter, HFBR-25X6Z 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-RXXYYYZ plastic optical ber , with a maximum attenuation of 0.24 dB/m at 650 nm and NA = 0.5.
Extra low loss cable is HFBR-EXXYYYZ plastic optical ber, with a maximum attenuation of 0.19 dB/m at 650 nm and NA = 0.5.
HCS cable is HFBR-H/VXXYYY glass optical ber, with a maximum attenuation of 10 dB/km at 650 nm and NA = 0.37.
6. Optical Power Budget is the di erence between the transmitter output power and the receiver sensitivity, measured after 1 meter of ber.
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 e ects 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 xed passive losses (such as in-line connectors) in addition to the minimum speci ed distance.