HFBR-0507Z Series
HFBR-15X7Z Transmitters
HFBR-25X6Z Receivers
125 Megabaud Versatile Link
The Versatile Fiber Optic Connection
Data Sheet
Description
The 125 MBd Versatile Link (HFBR-0507Z 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-15X7Z, and a PIN/pre-
amp receiver, HFBR-25X6Z. 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-15X7Z 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
and 200 µm Hard Clad Silica (HCS
®
) fiber. With the recom-
mended drive circuit, the LED operates at speeds from
1-125 MBd. The HFBR-25X6Z is a high bandwidth analog
receiver containing a PIN photodiode and internal tran-
simpedance amplifier. With the recommended applica-
tion 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-0507Z Series to optimize perfor-mance
and cost at higher and lower data rates.
Features
•
RoHS-compliant
•
Data transmission at signal rates of 1 to 125 MBd over
distances of 100 meters
•
Compatible with inexpensive, easily terminated plas-
tic optical fiber, and with large core silica fiber
•
High voltage isolation
•
Transmitter and receiver application circuit
schematics and recommended board layouts avail-
able
•
Interlocking feature for single channel or duplex links,
in a vertical or horizontal mount configuration
Applications
•
•
•
•
•
•
•
•
Intra-system links: board-to-board, rack-to-rack
Telecommunications switching systems
Computer-to-peripheral data links, PC bus extension
Industrial control
Proprietary LANs
Digitized video
Medical instruments
Reduction of lightning and voltage transient suscepti-
bility
HCS
®
is a registered trademark of Spectran Corporation.
HFBR-0507Z Series
125 MBd Data Link
Data link operating conditions and performance are
specified 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 Engineering 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.
Ambient Temperature
Supply Voltage
Data Input Voltage – Low
Data Input Voltage – High
Data Output Load
Signaling Rate
Duty Cycle
T
A
V
CC
V
IL
V
IH
R
L
f
S
D.C.
0
+4.75
V
CC
-1.89
V
CC
-1.06
45
1
40
Max.
70
+5.25
V
CC
-1.62
V
CC
-0.70
55
125
60
Unit
°C
V
V
V
Ω
MBd
%
Reference
Note 1
Note 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
OPB
POF
OPM
POF,20
l
OPM
POF,25
l
OPB
HCS
OPM
HCS,100
l
Min.
[3]
11
3
20
3
25
7
3
100
Typ.
[4]
16
6
27
6
32
12
6
125
Max.
Unit
dB
dB
m
dB
m
dB
dB
m
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 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 specifications 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 fiber , 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 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.
2
Plastic Optical Fiber (1 mm POF) Transmitter Application Circuit:
Performance of the HFBR-15X7Z transmitter in the recom-
mended application circuit (Figure 1) for POF; 1-125 MBd, 25°C.
Parameter
Symbol
Typical
Unit
Condition
Note
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
I
CC
P
avg
P
mod
t
r
t
f
I
F,H
I
F,L
-9.7
-11.3
2.1
2.8
19
3
45
110
dBm
dBm
ns
ns
mA
mA
%
mA
Figure 1
5 MHz
5 MHz
Note 3
Note 3
50% Duty
Cycle
Note 1, Fig 3
Note 2, Fig 3
Hard Clad Silica Fiber (200 µm HCS) Transmitter Application Circuit:
Performance of the HFBR-15X7Z transmitter in the recom-
mended application circuit (Figure 1) for HCS; 1-125 MBd, 25°C.
Parameter
Symbol
Typical
Unit
Condition
Note
Average Optical Power 200 µm HCS
Average Modulated Power 200 µm 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 µm HCS
Transmitter Application Circuit
Current Consumption - 200 µm HCS
I
CC
P
avg
P
mod
t
r
t
f
I
F,H
I
F,L
-14.6
-16.2
3.1
3.4
60
6
30
130
dBm
dBm
ns
ns
mA
mA
%
mA
Figure 1
5 MHz
5 MHz
Note 3
Note 3
50% Duty
Cycle
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:
Average Modulated Power =
[P
avg
@ 80% duty cycle - P
avg
@ 20% duty cycle]
(2) [0.80 - 0.20]
3. High and low level LED currents refer to the current through the HFBR-15X7Z 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.
3
Plastic and Hard Clad Silica Optical Fiber Receiver Application Circuit:
Performance
[4]
of the HFBR-25X6Z receiver in the recom-
mended application circuit (Figure 1); 1-125 MBd, 25°C unless otherwise stated.
Parameter
Symbol
Typical
Unit
Condition
Note
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
V
OL
V
OH
P
min
P
min
P
max
P
max
I
CC
V
CC
-1.7
V
CC
-0.9
-27.5
-28.5
-7.5
-10.5
85
V
V
dBm
dBm
dBm
dBm
mA
R
L
= 50 Ω
R
L
= 50 Ω
50% eye opening
50% eye opening
50% eye opening
50% eye opening
R
L
= ∞
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-15X7Z transmitter driven with the recommended circuit at 1-125 MBd over 1 meter of
HFBR-RZ/EXXYYYZ plastic optical fiber or 1 meter of HFBR-H/VXXYYY hard clad silica optical fiber.
5. Terminated through a 50 Ω resistor to V
CC
- 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 encod-
ing 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
V
CC
14
9
10 U1C
8
R8*
Q3
2N3904
C3
0.1
C4
0.001
C5
10
+
C6
0.1
1
2
3
4
C7
0.001
8
U2
5 HFBR-15X7Z
7 74ACTQ00
Q1
BFQ52
Q2
BFQ52
12
13 U1D
U1A
3
74ACTQ00
4
5 U1B
6
C8*
11
1
2
74ACTQ00
R9*
R6
91
9
8
7
6
5
4
3
2
J1 1
T
X
V
EE
Q2 BASE
Q1 BASE
T
X
V
CC
R
X
V
CC
NC
PIN 19 10H116
PIN 18 10H116
R
X
V
EE
R7
91
74ACTQ00
R10
15
R11*
C20
10
+
C19
0.1
V
BB
R22
1K
R18
51
15
17
C15
0.1
R25
1K
R23
1K
V
BB
C18
0.1
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
V
CC
3V
V
CC
3V
V
BB
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
C12
0.1
R15
1K
C11
0.1
MC10H116FN
18
19
U4C
R19
51
1
2
3
4
U3
5 HFBR-25X6Z
R20
12
V
BB
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
U5
TL431
10
C13
0.1
Figure 1. Transmitter and receiver application circuit with +5 V ECL inputs and outputs.
4
120
+5 V ECL
SERIAL DATA
SOURCE
82
0.1 µF
+
5V
Ð
+
0.1 µF
82
+5 V ECL
SERIAL DATA
RECEIVER
120
120
4.7 µH
82
10 µF
0.1 µF
4.7 µH
10 µF
4.7 µH
0.1 µF
82
120
9 T
X
V
EE
8 TD
7 TD
6 T
X
V
CC
5 R
X
V
CC
+
4
3 RD
2 RD
1 R
X
V
EE
FIBER-OPTIC
TRANSCEIVER
SHOWN IN
FIGURE 1
Figure 2. Recommended power supply filter and +5 V ECL signal terminations for the transmitter and receiver applica-
tion circuit of Figure 1.
200
21
19
OPTICAL POWER BUDGET ÐdB
POF
еW
150
17
15
13
11
9
10
HCS
AVERAGE POWER
100
AVERAGE
MODULATED
POWER
AVERAGE POWER,
50% DUTY CYCLE
0
0
20
40
DUTY CYCLE
60
Ð%
80
100
50
30
50
70
90
110
130
150
DATA RATE Ð MBd
Figure 3. Average modulated power.
Figure 4. Typical optical power budget vs. data rate.
5
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