The 125 MBd Versatile Link (HFBR-0507ETZ Series) is the
most cost-effective fiber-optic solution for transmission
of 125 MBd data over 100 m. The data link consists of
a 650 nm LED transmitter, HFBR-1527ETZ, and a PIN/
preamp receiver, HFBR-2526ETZ. 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 m. 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-1527ETZ 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
m
Hard Clad Silica (HCS
®
) fiber. With the recommended drive
circuit, the LED operates at speeds from 1-125 MBd. The
HFBR-2526ETZ is a high bandwidth analog receiver con-
taining 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 m with plastic fiber and 0-100 m
with 200
m
HCS
fiber. A wide variety of other digitizing
circuits can be combined with the HFBR-0507ETZ Series to
optimize performance and cost at higher and lower data
rates.
Features
-40° to +85°C operating temperature range
RoHS-compliant
Data transmission at signal rates of 1 to 125 MBd over
distances of 100 m
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
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
Renewable energies
Medical instruments
Reduction of lightning and voltage transient suscep-
tibility
HCS
is a registered trademark of OFS Corporation.
HFBR-0507ETZ Series
125 MBd Data Link
Data link operating conditions and performance are specified for the HFBR-1527ETZ transmitter and HFBR-2526ETZ
receiver in the recommended applications circuits shown in Figure 1. This circuit has been optimized for 125 MBd
operation. For other data rate application, please refer to application notes: AN1121, AN1122 and AN1123.
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
T
A
V
CC
V
IL
V
IH
R
L
f
S
D.C.
Min.
-40
+4.75
V
CC
-1.89
V
CC
-1.06
45
1
40
Max.
85
+5.25
V
CC
-1.62
V
CC
-0.70
55
125
60
Unit
°C
V
V
V
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
resistor to V
CC
- 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-1527ETZ transmitter, HFBR-2526ETZ 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 plastic optical fiber, with a maximum attenuation of 0.19 dB/m at 650 nm and NA = 0.5.
HCS cable is 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 m 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.
2
Plastic Optical Fiber (1 mm POF) Transmitter Application Circuit
Performance of the HFBR-1527ETZ transmitter in the recommended application circuit (Figure 1) for POF; 1-125 MBd, 25° C.
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
I
CC
Symbol
P
avg
P
mod
t
r
t
f
I
F,H
I
F,L
Typical
-9.7
-11.3
2.1
2.8
19
3
45
110
Unit
dBm
dBm
ns
ns
mA
mA
%
mA
Condition
50% Duty Cycle
5 MHz
5 MHz
Note
Note 1, Fig 3
Note 2, Fig 3
Note 3
Note 3
Figure 1
Hard Clad Silica Fiber (200 μm HCS) Transmitter Application Circuit
Performance of the HFBR-1527ETZ transmitter in the recommended application circuit (Figure 1) for HCS; 1-125 MBd,
25° C.
Parameter
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
m
HCS
Transmitter Application Circuit Current Consumption –
200
m
HCS
I
CC
Symbol
P
avg
P
mod
t
r
t
f
I
F,H
I
F,L
Typical
-14.6
-16.2
3.1
3.4
60
6
30
130
Unit
dBm
dBm
ns
ns
mA
mA
%
mA
Condition
50% Duty Cycle
5 MHz
5 MHz
Note
Note 1, Fig 3
Note 2, Fig 3
Note 3
Note 3
Figure 1
Notes:
1. Average optical power is measured with an average power meter at 50% duty cycle, after 1 m 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:
[P
avg
@ 80% duty cycle – P
avg
@ 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-1527ETZ 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-2526ETZ receiver in the recommended application circuit (Figure 1); 1-125 MBd, 25° C 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
V
OL
V
OH
Pm
in
P
min
P
max
P
max
I
CC
Typical
V
CC
-1.7
V
CC
-0.9
-27.5
-28.5
-7.5
-10.5
TBA
Unit
V
V
dBm
dBm
dBm
dBm
mA
Condition
R
L
= 50
R
L
= 50
50% eye opening
50% eye opening
50% eye opening
50% eye opening
R
L
=
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-1527ETZ transmitter driven with the recommended circuit at 1-125 MBd over 1 m of HFBR-RZ/
EXXYYYZ plastic optical fiber or 1 m of hard clad silica optical fiber.
5. Terminated through a 50
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 encoding
and error detection prevent random triggering from being interpreted as valid data.
L1
TDK
#HF30ACB453215
+5 V
R5
22
TD+
Q1
BFT92
Q2
BFT92
9
TD–
1
2
U1A
74ACTQ00
3
10
U1D
74ACTQ00
12
11
13
U1B
74ACTQ00
4
5
R6
91
R7
91
R11
6
C8
R9
+
C1
0.001 F
C2
0.1 F
U1C
74ACTQ00
8
C3
0.1 F
C4
0.001 F
C5
10 F
C6
0.1 F
C7
0.001 F
8
Q3
MMBT3904LT1
R8
1
2
U2A
3 HFBR-15X7ETZ
4
5
R10
0V
8
1
U3A 2
HFBR- 3
2526ETZ
4
5
C12
10 nFC11
10 nF
C14
10 nF
R13
4.7
C9
0.1 F
C10
0.1 F
+
R12
4.7
C13
1 nF
1 Caz-
2 Caz+
3 GDNa
4 Din
5 Din
6 Vcca
7 CF
8 JAM
Vset 16
NC 15
Vcce 14
Dout 13
Dout 12
GDNe 11
ST 10
ST 9
R14
800
RD+
RD-
SD+
+5 V
+
C22
10 F
0V
L3
COILCRAFT 1008LS-122XKBC
R18
2.2k
R17
2.2k
C19
0.1 F
+
C20
10 F
C21
0.1 F
MC2045-2Y
L2
COILCRAFT 1008LS-122XKBC
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
+
+
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
5V
Figure 2. Recommended power supply filter and +5 V ECL signal terminations for the transmitter and receiver application circuit of Figure 1
200
OPTICAL POWER BUDGET dB
21
19
17
15
13
11
9
10
30
50
70
110
90
DATA RATE MBd
130
150
HCS
POF
AVERAGE POWER
μW
150
100
AVERAGE
MODULATED
POWER
AVERAGE POWER,
50% DUTY CYCLE
0
0
20
40
60
DUTY CYCLE %
80
100
50
Figure 3. Average modulated power
Figure 4. Typical optical power budget vs. data rate
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