SERCOS Fiber Optic
Transmitters and Receiver
Technical Data
HFBR-0600 Series
Features
• Fully Compliant to SERCOS
Optical Specifications
• Optimized for 1 mm Plastic
Optical Fiber
• Compatible with SMA
Connectors
• Auto-Insertable and Wave
Solderable
• Data Transmission at
Symbol Rates from DC to
over 2 MBd for Distances
from 0 to over 20 Metres
Applications
• Industrial Control Data
Links
• Reduction of Lightning and
Voltage Transient Suscepti-
bility
• Tempest-Secure Data
Processing Equipment
• Isolation in Test and
Measurement Instruments
• Robotics Communication
controlled machines. The SERCOS
interface specification was written
by a joint working group of the
VDW (German Machine Tool
Builders Association) and ZVEI
(German Electrical and Electronic
Manufacturer’s Association) to
allow data exchange between NC
controls and drives via fiber optic
rings, with isolation and noise
immunity. The HFBR-0600 family
of fiber optic transmitters and
receivers comply to the SERCOS
specifications for transmitter and
receiver optical characteristics
and connector style (SMA).
SERCOS high attenuation
specifications.
The HFBR-2602 receiver incor-
porates an integrated photo IC
containing a photodetector and dc
amplifier driving an open-
collector Schottky output
transistor. The HFBR-2602 is
designed for direct interfacing to
popular logic families. The
absence of an internal pull-up
resistor allows the open-collector
output to be used with logic
families such as CMOS requiring
voltage excursions higher than
V
CC
. The HFBR-2602 has a
dynamic range of 15 dB.
Description
The HFBR-0600 components are
capable of operation at symbol
rates from DC to over 2 MBd and
distances from 0 to over 20
metres. The HFBR-1602 and
HFBR-1604 transmitters contain
a 655-nm AlGaAs emitter capable
of efficiently launching optical
power into 1000
µm
plastic
optical fiber. The optical output is
specified at the end of 0.5 m of
plastic optical fiber.
The HFBR-1604 is a selected
version of the HFBR-1602, with
power specified to meet the
SERCOS
SERCOS is a SErial Realtime
COmmunication System, a
standard digital interface for
communication between controls
and drives for numerically
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.
2
HFBR-160X Transmitters
HFBR-2602 Receiver
HFBR-0600 SMA Series
Mechanical Dimensions
PART NUMBER
DATE CODE
1/4 - 36 UNS 2A
THREAD
HFBR-X60X
12.7
(0.50)
YYWW
22.2
(0.87)
*Pins 1, 4, 5, and 8 are isolated from the internal circuitry, but electrically connected to
one another.
**Transmitter Pin 7 may be left unconnected if necessary.
In the receiver, both the open-
collector “Data” output Pin 6 and
V
CC
Pin 2 are referenced to
“Common” Pin 3 and 7. It is
essential that a bypass capacitor
(0.1
µF
ceramic) be connected
from Pin 2 (V
CC
) to Pin 3 (circuit
common) of the receiver.
SMA is an industry standard fiber
optic connector, available from
many fiber optic connector
suppliers. HFBR-4401 is a kit
consisting of 100 nuts and 100
washers for panel mounting the
HFBR-0600 components.
3
HFBR-1602/1604 Transmitters
Absolute Maximum Ratings
Parameter
Storage Temperature
Operating Temperature
Lead Soldering Cycle
Temp.
Time
Forward Input Current Peak
Forward Input Current Average
Reverse Input Voltage
I
FPK
I
Favg
V
BR
Symbol
T
S
T
A
Min.
-55
-40
Max.
85
85
260
10
120
60
-5
Unit
°C
°C
°C
s
mA
mA
V
Note 1
Note 1
Reference
Electrical/Optical Characteristics
0 to 55°C, unless otherwise stated.
Parameter
Forward Voltage
Forward Voltage
Temp. Coefficient
Reverse Input Voltage
Peak Emission
Wavelength
Full Width Half
Maximum
Diode Capacitance
Optical Power Temp.
Coefficient
Thermal Resistance
Peak Optical Output
Power of HFBR-1602
Peak Optical Output
Power of HFBR-1604
Rise Time (10% to 90%)
Fall Time (90% to 10%)
Symbol
V
F
∆V
F
/∆T
V
BR
λ
P
FWHM
C
T
∆P
T
/∆T
θ
JA
P
T1602
P
T1604
t
r
t
f
-10.5
-7.5
-10.5
57
50
40
27
-5.0
640
Min.
1.5
Typ.
[2]
1.9
-1.2
-18
655
20
30
-0.01
330
-5.5
-3.5
-5.5
675
30
Max.
2.2
Unit
V
mV/°C
V
nm
nm
pF
dBm/°C
°C/W
dBm
dBm
dBm
ns
ns
ns
ns
I
F
= 35 mA
I
F
= 60 mA
I
F
= 35 mA
I
F
= 60 mA
I
F
= 35 mA
I
F
= 60 mA
I
F
= 35 mA
25°C
V
F
= 0
f = 1 MHz
I
F
= 35 mA
Notes 3, 4
Notes 5, 6,
11
Notes 5, 6,
11
Condition
I
F
= 35 mA
I
F
= 35 mA
I
R
= 100
µA
Reference
4
HFBR-2602 Receiver
Absolute Maximum Ratings
Parameter
Storage Temperature
Operating Temperature
Lead Soldering Cycle
Temp.
Time
Supply Voltage
Output Current
Output Voltage
Output Collector Power Dissipation
Fan Out (TTL)
V
CC
I
O
V
O
P
O AVG
N
-0.5
-0.5
Symbol
T
S
T
A
Min.
-55
-40
Max.
85
85
260
10
7.0
25
18.0
40
5
Unit
°C
°C
°C
s
V
mA
V
mW
Note 8
Note 1
Note 1
Reference
Electrical/Optical Characteristics
0 to 55°C;
Fiber core diameter
≤
1.0 mm, fiber N.A.
≤
0.5, 4.75 V
≤
V
CC
≤
5.25 V
Parameter
High Level Output
Current
Low Level Output
Voltage
High Level Supply
Current
Low Level Supply
Current
Symbol
I
OH
V
OL
I
CCH
I
CCL
Min.
Typ.
[2]
5
0.4
3.5
6.2
Max.
250
0.5
6.3
10
Unit
µA
V
mA
mA
Condition
V
OH
= 18 V
P
R
< -31.2 dBm
I
OL
= 8 mA
P
R
> -20.0 dBm
V
CC
= 5.25 V
P
R
< -31.2 dBm
V
CC
= 5.25 V
P
R
> -20.0 dBm
Reference
Dynamic Characteristics
0 to 55°C unless otherwise specified; 4.75 V
≤
V
CC
≤
5.25 V; BER
≤
10
-9
Parameter
Peak Input Power
Level Logic HIGH
Peak Input Power
Level Logic LOW
Propagation Delay
LOW to HIGH
Propagation Delay
HIGH to LOW
Pulse Width
Distortion,
t
PLH
- t
PHL
Symbol
P
RH
P
RL
t
PLH
t
PHL
PWD
-20.0
60
110
50
-50
Min.
Typ.
[2]
Max.
-31.2
-5.0
Unit
dBm
dBm
ns
ns
ns
ns
Condition
λ
P
= 655 nm
I
OL
= 8 mA
P
R
= -20 dBm
2 MBd
P
R
= -20 dBm
2 MBd
P
R
= -5 dBm
P
R
= -20 dBm
Reference
Note 7
Note 7
Note 8, 9
Note 8, 9
Note 10
Figure 6
5
Notes:
1. 2.0 mm from where leads enter case.
2. Typical data at T
A
= +25°C.
3. Thermal resistance is measured with
the transmitter coupled to a connector
assembly and fiber, and mounted on a
printed circuit board.
4. Pins 2, 6, and 7 are welded to the
cathode header connection to minimize
the thermal resistance from junction to
ambient. To further reduce the thermal
resistance, the cathode trace should be
made as large as is consistent with
good RF circuit design.
5. P
T
is measured with a large area
detector at the end of 0.5 metre of
plastic optical fiber with 1 mm
6.
7.
8.
9.
diameter and numerical aperture of
0.5.
When changing
µW
to dBm, the optical
power is referenced to 1 mW (1000
µW).
Optical Power P(dBm) = 10 log
[P (µW)/1000
µW].
Measured at the end of 1mm plastic
fiber optic cable with a large area
detector.
8 mA load (5 x 1.6 mA), R
L
= 560
Ω.
Propagation delay through the system
is the result of several sequentially
occurring phenomena. Consequently it
is a combination of data-rate-limiting
effects and of transmission-time
effects. Because of this, the data-rate
limit of the system must be described
in terms of time differentials between
delays imposed on falling and rising
edges. As the cable length is increased,
the propagation delays increase. Data-
rate, as limited by pulse width distor-
tion, is not affected by increasing cable
length if the optical power level at the
receiver is maintained.
10. Pulse width distortion is the difference
between the delay of the rising and
falling edges.
11. Both HFBR-1602 and HFBR-1604
meet the SERCOS "low attenuation"
specifications when operated at 35 mA;
only HFBR-1604 meets the SERCOS
"high attenuation" limits when operated
at 60 mA.
Figure 1. Forward Voltage and
Current Characteristics.
Figure 2. Typical Transmitter Output
vs. Forward Current.
Figure 3. Transmitter Spectrum
Normalized to the Peak at 25
°
C.
Figure 4. Typical Propagation Delay through
System with 0.5 Metre of Cable.
Figure 5. Typical HFBR-160X/2602 Link
Pulsewidth Distortion vs. Optical Power.
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