264
10 Megabaud Versatile Link
Fiber Optic Transmitter
and Receiver for 1 mm POF and
200 µm HCS®
Technical Data HFBR-0508 Series
HFBR-1528 Transmitter
HFBR-2528 Receiver
Features
• Data Transmission at Signal
Rates of dc to 10 MBd
• Up to 50 Meters Distances
with 1 mm Plastic Optical
Fiber (POF)
• Up to 500 Meters Distances
with 200 µm Hard Clad
Silica (HCS®)
• Wide Dynamic Range
Receiver Allows Operation
from Zero to Maximum Link
Distance with a Single
Transmitter Drive Current
• Link Distances Specified for
Variations in Temperature,
Power Supply, and Fiber
Attenuation
• DC Coupled Receiver with
CMOS/TTL Output for Easy
Designs: No Data Encoding
or Digitizing Circuitry
Required
• Pulse Width Distortion
Controlled to Limit
Distortion from Low Duty
Cycle or Burst Mode Data
•␣ High Noise Immunity
• Compatible with HP’s
Versatile Link Family of
Connectors, for Easy
Termination of Fiber
Applications
• Industrial Control and
Factory Automation
• Serial Field Buses
• Intra-System Links; Board-
to-Board, Rack-to-Rack
• Extension of RS-232, RS-485
• Elimination of Ground Loops
• High Voltage Isolation
• Reduces Voltage Transient
Susceptibility
Description
The HFBR-0508 Series consists of
a fiber-optic transmitter and
receiver operating at a 650 nm
wavelength (red). The HFBR-
1528 transmitter is an LED in a
low cost plastic housing designed
to efficiently couple power into
200 µm diameter HCS and 1 mm
diameter POF. The HFBR-2528
receiver incorporates a PIN detec-
tor and digital output IC compat-
ible with CMOS and TTL logic
families.
HFBR-0508 links operate from
DC to 10 MBd at distances up to
50 meters with 1 mm POF and up
CAUTION:. It is advised that normal static precautions be taken in handling and assembly of these components
to prevent damage and/or degradation which may be induced by ESD.
HCS® is a registered trademark of SpecTran Corporation.
to 500 meters with 200 µm HCS®.
No minimum link distances are
required when using recom-
mended circuits, simplifying
design.
Versatile Link components can be
interlocked (N-plexed together) to
minimize space and to provide
dual connections with the duplex
connectors. Up to eight packages
can be interlocked and inserted
into a printed circuit board.
POF and HCS are available in pre-
connectored lengths or can be
easily field-terminated. A single
transmitter drive current for POF
and HCS allows both fibers to be
used with a single design.
5963-3591E (1/97)
265
Notes:
1. Typical data at +25°C, VCC = 5 V.
2. With recommended transmitter and receiver application circuits (60 mA nominal drive current).
3. POF is HFBR-R/EXXYYY plastic (1 mm) optical fiber. Worst case attenuation used (0.23 dB/m from -40°C to +85°C at 660 nm).
4. HCS is HFBR-H/VXXYYY hard clad silica (200/230 µm) fiber. Worst case attenuation is used (10 dB/km from 0°C to +70°C and
12 dB/km from -40°C to +85°C at 650 nm).
5. BER ≤ 10-9, 223 - 1 PRBS NRZ 10 MBd.
6. For IF,PK > 60 mA, the duty factor must maintain IF, AV ≤ 60 mA and pulse with ≤ 1 µs.
7. 1.6 mm below seating plane.
Recommended Operating Conditions
Parameter Symbol Min. Max. Unit Condition Note
Ambient Temperature TA-20 +85 °C
Power Supply Voltage VCC 4.75 5.25 V <100 mVp-p Noise
Transmitter Peak Forward Current IF,PK 20 90 mA 6
Transmitter Average Forward Current IF,AV 60 mA
Fanout (7400 Series TTL) N 1
Absolute Maximum Ratings
Parameter Symbol Min. Max. Unit Note
Storage and Operating Temperature, Transmitter TS,O -40 +85 °C
Storage and Operating Temperature, Receiver TS,O -20 +85 °C
Receiver Supply Voltage VCC -0.5 +5.5 V
Receiver Average Output Current IO,AVG -16 +16 mA
Receiver Output Power Dissipation POD 80 mW
Transmitter Peak Forward Input Current IF,PK 90 mA 6
Transmitter Average Forward Input Current IF,AVG 60 mA
Transmitter Reverse Input Voltage VR3V
Lead Soldering Cycle Temp TSOL +260 °C7
Time 10 sec 7
Specified Link Performance, T
A = -20° to +85°C, DC to 10 MBd, unless otherwise noted.
Parameter Symbol Min. Max. Unit Condition Note
Signaling Rate fSDC 10 Mb/s NRZ 2
Link Distance with Extra Low 0.1 50 m +25°C 2, 3, 5
Loss POF Cable 0.1 40 0 to +70°C
0.1 30 -20 to +85°C
Link Distance with 200 µm 0.1 500 m +25°C 2, 4, 5
HCS Cable 0.1 300 0 to +70°C
0.1 100 -20 to +85°C
Pulse Width Distortion PWD -30 +30 ns 25 – 75% Duty Cycle 2
-50 +50 ns Arbitrary Duty Cycle
HFBR-0508 Series 10 MBd Data Link
Typical Link Performance, T
A = +25°C
Parameter Symbol Typ.[1] Unit Condition Note
Signaling Rate fS15 Mb/s NRZ 2
Link Distance with Extra Low Loss POF Cable 100 m 10 MBd 2, 3, 5
Link Distance with 200 µm HCS Cable 900 m 10 MBd 2, 4, 5
266
Electrical and Optical Characteristics: T
A = -40° to +85°C unless otherwise noted.
Parameter Symbol Min. Typ.[1] Max. Units TA (°C) Conditions Note
Peak Output Power PT-6.0 -3.5 0.0 dBm +25 IF, dc = 60 mA 2, 3
-6.9 +0.5 0 to +70
-7.2 +1.3 -40 to +85
Peak Output Power PT-15.6 -9.0 -2.0 dBm +25 IF,dc = 20 mA 2, 3
-16.5 -1.5 0 to +70
-16.8 -0.7 -40 to +85
Peak Output Power PT-16.1 -12.5 -8.5 dBm +25 IF,dc = 60 mA 2, 3
-17.0 -8.0 0 to +70
-17.3 -7.2 -40 to +85
Optical Power Tem- ∆PT/∆T -0.40 %/°C
-0.02 dB/°C
Peak Emission λP640 650 660 nm 0 to +70
635 662 -40 to +85
Peak Wavelength ∆λ/∆T 0.12 nm/°C
Temperature
Coefficient
Spectral Width FWHM 21 nm Fig. 3
Forward Voltage VF1.8 2.1 2.65 V IF,dc = 60 mA Fig. 1
Forward Voltage Tem- ∆VF/∆T-1.8mV/°C Fig. 1
perature Coefficient
Reverse Input Break- VBR 3.0 13 V IF,dc = -10 µA
down Voltage
Diode Capacitance CO60 pF VF = 0 V,
f = 1 MHz
Transmitter NA 0.5
Numerical Aperture
Thermal Resistance, θjc 140 °C/W 4
Junction to Case
50 Ω Optical Rise Time tr13 ns 10% to 90%,
IF = 60 mA
50 Ω Optical Fall Time tf10 ns
Notes:
1. Typical data are at +25°C.
2. Optical power measured at the end of 0.5 meters of 1 mm diameter plastic or 200 µm diameter hard clad silica fiber with a large area
detector.
3. Minimum and maximum values for PT over temperature are based on a fixed drive current. The recommended drive circuit has
temperature compensation which reduces the variation in PT over temperature; refer to Figures 4 and 6.
4. Typical value measured from junction to PC board solder joint for horizontal mount package, HFBR-1528.
5. Pins 5 and 8 are for mounting and retaining purposes, but are electrically connected; pins 3 and 4 are electrically isolated. It is
recommended that pins 3, 4, 5 and 8 all be connected to ground to reduce coupling of electrical noise.
6. Refer to the “Plastic Optical Fiber and HCS Fiber Cable and Connectors for Versatile Link” Technical Data Sheet for cable connector
options for 1 mm plastic and 200 µm HCS optical fiber.
plastic optical fiber (POF) and
Hard Clad Silica (HCS) fiber. This
transmitter can be operated up to
10 MBd using a simple driver
circuit. The HFBR-1528 is com-
patible with all Versatile Link
connectors.
ANODE 1
CATHODE 2
GROUND 3
GROUND 4
8 GROUND
5 GROUND
SEE NOTE 5
HFBR-1528 Transmitter, Top View
HFBR-1528 Transmitter
The HFBR-1528 transmitter
incorporates a 650 nm LED in a
light gray, nonconductive plastic
housing. The high light output
power enables the use of both
Fig. 3
1 mm POF, 60 mA
1 mm POF, 20 mA
200 µm HCS, 60 mA
Fig. 2
Fig. 2
Fig. 2
perature Coefficient
Wavelength
267
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.
Figure 6. Recommended Transmitter Drive Circuit
(IF,on = 60 mA Nominal at TA = 25°C).
Figure 5. Typical Optical Pulse Width Distortion vs.
Temperature and Power Supply Voltage (in Recommended
Drive Circuit).
V
CC
VALUE
1
4
2
3
8
5
DATA
C1
R1
HFBR-1528
TOLERANCE
R1
R2
2 KΩ
47 Ω
5 %
1 %
68 5
7
R2
C2
4
C1
C2
0.1 µF
1.0 µF
20 %
20 %
1/2 SN75451
Figure 4. Typical Normalized Optical Power vs. Temperature
(in Recommended Drive Circuit).
Figure 3. Typical Normalized Optical Spectra.
V
F
– FORWARD VOLTAGE – V
1
2.1
1.5
I
F,DC
– TRANSMITTER DRIVE CURRENT – mA
10 100
2.5
1.7
2.3
1.9
25° C
0° C
70° C
85° C
-40° C
Figure 2. Typical Normalized Optical Power vs. Drive
Current.
Figure 1. Typical Forward Voltage vs. Drive Current.
NORMALIZED SPECTRAL OUTPUT POWER
610
1.2
0.6
0
WAVELENGTH (nm)
630 650 670 690
1.0
0.2
0.8
0.4
1.4
25° C
0° C
-40° C
70° C
85° C
NORMALIZED OUTPUT POWER
-40
1.2
0.9
0.7
TEMPERATURE – °C
-20 20 60
1.1
0.8
1.0
04080
V
CC
= 5.25 V
V
CC
= 5.0 V
V
CC
= 4.75 V
P
T
– NORMALIZED OUTPUT POWER – dB
1
-10
-40
I
F,DC
– TRANSMITTER DRIVE CURRENT – mA
10 100
10
-30
0
-20
25° C
85° C
-40° C
PWD – ns
-40
2
-1
-5
TEMPERATURE – °C
20
1
-2
0
60
-3
-4
V
CC
= 5.25 V
V
CC
= 5.0 V
V
CC
= 4.75 V
040
80
-20
268
HFBR-2528 Receiver
The HFBR-2528 receiver consists
of a silicon PIN photodiode and
digitizing IC to produce a logic
compatible output. The IC
includes a unique circuit to
correct the pulse width distortion
of the first bit after a long idle
period. This enables operation
from DC to 10 MBd with low
PWD for arbitrary data patterns.
The receiver output is a “push-
pull” stage compatible with TTL
and CMOS logic. The receiver
housing is a dark, conductive
plastic, compatible with all
Versatile Link connectors.
Electrical and Optical Characteristics: T
A = -20° to +85°C, 4.75 V < VCC < 5.25 V, unless
otherwise noted.
Parameter Symbol Min. Typ.[1] Max. Unit TA (°C) Condition Note Fig.
Peak POF Sensitivity: PRL,min -23.0 -21.0 dBm +25 1 mm POF, 2,6 2,4
Minimum Input for -20.0 0 to +70 |PWD| < 30 ns
Logic “0” -19.5 -20 to +85
Peak POF Overdrive PRL,max +1.0 +5.0 dBm +25 1 mm POF, 2,3, 1,2,
Limit:Maximum +0.0 0 to +70 |PWD| < 30 ns 6 3
Input for Logic “0” -1.0 -20 to +85
Peak POF Off State PRH,max -42 dBm 1 mm POF 2,6,
Limit: Maximum 8
Input for Logic “1”
Peak HCS PRL,min -25.0 -23.0 dBm +25 200 µm HCS, 2,6
Sensitivity: Minimum -22.0 0 to +70 |PWD| < 30 ns
Input for Logic “0” -21.5 -20 to +85
Peak HCS Overdrive PRL,max -1.0 +3.0 dBm +25 200 µm HCS, 2,3,
Limit: Maximum -2.0 0 to +70 |PWD| < 30 ns 6
Input for Logic “0” -3.0 -20 to +85
Peak HCS Off State PRH,max -44 dBm 200 µm HCS 2,6,
Limit: Maximum 8
Input for Logic “1”
Supply Current ICC 27 45 mA VO = Open
High Level Output VOH 4.2 4.7 V IO = -40 µA
Voltage
Low Level Output VOL 0.22 0.4 V IO = +1.6 mA
Voltage
Output Rise Time tr12 30 ns CL = 10 pF 6
Output Fall Time tf10 30 ns CL = 10 pF 6
Thermal Resistance, θjc 200 °C/W 4
Junction to Case
Electric Field EMAX 8 kV/m Near Field, 5
Immunity Electrical
Field Source
Power Supply PSNI 0.1 0.4 Vpp Sine Wave 6
Noise Immunity DC - 10 MHz
Notes:
1. Typical data are at +25°C, VCC = 5.0 V.
2. Input power levels are for peak (not average) optical input levels. For 50% duty cycle data, peak optical power is twice the average
optical power.
3. Receiver overdrive (PRL,max) is specified as the limit where |PWD| will not exceed 30 ns. The receiver will be in the correct state
(logic “0”) for optical powers above PRL,max. However, it may not meet a 30% symbol period PWD if the overdrive limit is exceeded.
Refer to Figure 2 for PWD performance at high received optical powers.
4. Typical value measured from junction to PC board solder joint for horizontal mount package, HFBR-2528.
5. Pins 5 and 8 are electrically connected to the conductive housing and are also used for mounting and retaining purposes. It is required
that pins 5 and 8 be connected to ground to maintain conductive housing shield effectiveness.
6. In recommended receiver circuit, with an optical signal from the recommended transmitter circuit.
7. Pin 4 is electrically isolated internally. Pin 4 may be externally connected to pin 1 for board layout compatibility with HFBR-25X1,
HFBR-25X2 and HFBR-25X4. Otherwise it is recommended pin 4 be grounded as in Figure 5.
8. BER ≤ 10E-9, includes a 10.8 dB margin below the receiver switching threshold level (signal to noise ratio = 12).
HFBR-2528 Receiver, Top View
NO CONNECT
4
V
CC
3
GROUND
2
V
O
1
GROUND 5
GROUND 8
SEE NOTES 5,7
IC
269
Figure 5. Recommended Receiver Application Circuit.
Figure 4. Typical POF Receiver Pulse Width Distortion vs.
Power Supply Voltage at Low Optical Power, (-21 dBm,pk,
10 MBd).
Figure 3. Typical POF Receiver Pulse Width Distortion
vs. Power Supply Voltage at High Optical Power
(0 dBm,pk, 10 MBd).
RECEIVED PWD – ns
-22
30
10
-30
P
RL
– RECEIVER OPTICAL INPUT POWER – dBm
-18
20
0
-2
-10
-20
-14 -10 -6 2
V
CC
VALUE
4
1
3
2
5
8
IC
DATA
C1
R1
HFBR-2528
TOLERANCE
R1
C1
2.7 Ω
0.1 µF
5 %
20 %
RECEIVED POWER – dBm
-40
6
4
0
TEMPERATURE – °C
-20
5
3
100
2
1
0 20406080
V
CC
= 5.25 V
V
CC
= 5.0 V
V
CC
= 4.75 V
Figure 2. Typical POF Receiver Pulse Width Distortion vs.
Optical Power at 10 MBd.
Figure 1. Typical POF Receiver Overdrive, PRL,max, at
10 MBd, vs. Temperature and Power Supply Voltage.
PWD – ns
4.7
16
9
V
CC
– VOLTS
4.8 5.55.0 5.1 5.3
4.9 5.2 5.4
13
12
11
10
14
15
PWD – ns
4.7
-13
-18
V
CC
– VOLTS
4.8
-14
-15
5.5
-16
-17
5.0 5.1 5.3
4.9 5.2 5.4
270
4 13 2
5 8
7.62
(0.300)
1.01° (0.040) DIA.
1.85
(0.073)MIN.
TOP VIEW
2.54
(0.100)
7.62
(0.300)
Figure 6. HFBR-2528 Receiver Block Diagram.
Versatile Link Mechanical Dimensions Versatile Link Printed Circuit Board
Layout Dimensions
6.8
(0.270) 10.2
(0.400)
4.2
(0.165)
1.27
(0.050)
2.5
(0.100)
0.51
(0.020)
PIN NO.1 INDICATOR
19.6
(0.770)
2.0
(0.080)
7.71
(0.305)
0.64
(0.025)
7.62
(0.300)
2.8
(0.109) 1.85
(0.073)
0.64 (0.025) DIA.
NOTE: ALL DIMENSIONS IN MM (INCHES).
ALL DIMENSIONS ± 0.25 mm UNLESS
OTHERWISE SPECIFIED.
5.1
(0.200)
4.06 (0.160) MAX.
3.56 (0.140) MIN.
TRANSMITTER
HFBR-1528 RECEIVER
HFBR-2528
1
2
3
4
5
8
ANODE
CATHODE
GROUND*
GROUND*
GROUND**
GROUND**
SIGNAL, V
O
GROUND
V
CC
(+5 V)
GROUND*
GROUND**
GROUND**
PIN NO.
* NO INTERNAL CONNECTION,
GROUND CONNECTION RECOMMENDED.
** PINS 5 AND 8 CONNECTED INTERNALLY
TO EACH OTHER.
ELECTRICAL PIN FUNCTIONS
3 VCC
PIN
PHOTODIODE
AMPLIFIER COM-
PARATOR
8 GROUND
1 VO, DATA
2 GROUND
5 GROUND
REFERENCE
VOLTAGE
THRESHOLD
GENERATOR
FIRST BIT
BURST PWD
CORRECTION
