HP HFBR-5527 Datasheet
125 Megabaud Fiber Optic
Transceiver
JIS FO7 Connection
Technical Data
HFBR-5527
Features
• Data Transmission at Signal
Rates of 1 to 125 MBd over
Distances up to 100 Meters
• Compatible with Duplex JIS
FO7 and Simplex JIS FO5
Connectors
• Specified for Use with
Plastic Optical Fiber (POF),
and with Large Core Silica
Fiber (HCS®)
• Transmitter and Receiver
Application Circuit
Schematics Available
• Conductive Plastic Housing
Provides Electrical Shield
Applications
• Intra-System Links: Boardto-Board, Rack-to-Rack
• High Voltage Isolation
• Telecommunications
Switching Systems
• Computer-to-Peripheral Data
Links, PC Bus Extension
• Industrial Control Networks
• Proprietary LANs
• Digitized Video
• Medical Instruments
• Immune to Lightning and
Voltage Transients
Description
The 125 MBd transceiver is a
cost-effective fiber-optic solution
for transmission of 125 MBd data
up to 100 meters with HCS
fiber. The data link consists of a
650 nm visible, red LED transmitter and a PIN/preamp receiver.
These can be used with low-cost
plastic or hard clad silica fiber.
One millimeter diameter plastic
fiber provides the lowest cost
solution for distances under 25
meters. The lower attenuation of
HCS® fiber allows data transmission over longer distance. These
components can be used for high
speed data links without the
problems common with copper
wire solutions.
The transmitter is a high power
650 nm LED. Both transmitter
and receiver are molded in one
housing which is compatible with
the FO7 connector. This connector is designed to efficiently
couple the power into POF or
HCS® fiber.
®
With the recommended drive
circuit, the LED operates at
speeds from 1-125 MBd. The
analog high bandwidth receiver
contains 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
0-25 meters with plastic fiber. A
wide variety of other digitizing
circuits can be combined with the
HFBR-5527 Series to optimize
performance and cost at higher or
lower data rates.
HCS® is a registered trademark of Spectran Corporation.
5965-7092E (5/97)
165
HFBR-5527 125 MBd Data Link
Data link operating conditions
and performance are specified for
the transmitter and 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 Hewlett-
Packard 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 Note
Ambient Temperature T
Supply Voltage V
Data Input Voltage - Low V
Data Input Voltage - High V
Data Output Load R
Signaling Rate f
A
CC
IL
IH
L
S
Duty Cycle D.C. 40 60 % 2
070°C
+4.75 +5.25 V
VCC –1.89 VCC –1.62 V
VCC –1.06 VCC –0.70 V
45 55 Ω 1
1 125 MBd
Link Performance: 1-125 MBd, BER ≤ 10
-9
, under recommended operating conditions with
recommended transmit and receive application circuits.
Parameter Symbol Min.
Optical Power Budget, 1 m POF OPB
Optical Power Margin, OPM
POF
POF,20
[3]
11 16 dB 5, 6, 7
3 6 dB 5, 6, 7
Typ.
[4]
Max. Unit Condition Note
20 m Standard POF
Link Distance with 1 20 27 m
Standard 1 mm POF
Optical Power Margin, OPM
POF,25
3 6 dB 5, 6, 7
25 m Low Loss POF
Link Distance with Extra 1 25 32 m
Low Loss 1 mm POF
Optical Power Budget, 1 m HCS OPB
Optical Power Margin, 100 m HCS OPM
HCS
HCS,100
12 dB 5, 6, 7
6 dB 5, 6, 7
Link Distance with HCS cable 1 125 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 VCC - 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 transmitter, 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-RXXYYY 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-EXXYYY 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 long term LED LOP degradation and additional fixed passive losses (such as in-line connectors) in addition to the
minimum specified distance.
166
Plastic Optical Fiber (1 mm POF) Transmitter Application Circuit:
Performance of the transmitter in the recommended application circuit (Figure 1) for POF; 1-125 MBd, 25°C.
Parameter Symbol Typical Unit Condition Note
Average Optical Power 1 mm POF P
avg
-9.7 dBm 50% Duty Note 1, Fig. 3
Cycle
Average Modulated Power 1 mm POF P
Optical Rise Time (10% to 90%) t
Optical Fall Time (90% to 10%) t
High Level LED Current (On) I
Low Level LED Current (Off) I
mod
r
f
F,H
F,L
-11.3 dBm Note 2, Fig. 3
2.1 ns 5 MHz
2.8 ns 5 MHz
30 mA Note 3
3 mA Note 3
Optical Overshoot - 1 mm POF 45 %
Transmitter Application Circuit I
CC
115 mA Figure 1
Current Consumption - 1 mm POF
Hard Clad Silica Fiber (200 µm HCS) Transmitter Application Circuit: Performance of
the transmitter in the recommended application circuit (Figure 1) for HCS; 1-125 MBd, 25°C.
Parameter Symbol Typical Unit Condition Note
Average Optical Power 200 µm HCS P
Average Modulated Power 200 µm HCS P
Optical Rise Time (10% to 90%) t
Optical Fall Time (90% to 10%) t
High Level LED Current (On) I
Low Level LED Current (Off) I
avg
mod
r
f
F,H
F,L
Optical Overshoot - 200 µm HCS 30 %
Transmitter Application Circuit I
CC
Current Consumption - 200 µm HCS
-14.6 dBm 50% Duty Note 1, Fig. 3
Cycle
-16.2 dBm Note 2, Fig. 3
3.1 ns 5 MHz
3.4 ns 5 MHz
60 mA Note 3
6 mA Note 3
130 mA Figure 1
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:
[P
@ 80% duty cycle - P
Average Modulated Power = ––——————————————————————
3. High and low level LED currents refer to the current through the 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.
avg
(2) [0.80 - 0.20]
@ 20% duty cycle]
avg
167
Plastic and Hard Clad Silica Optical Fiber Receiver Application Circuit:
Performance
otherwise stated.
Data Output Voltage - Low V
Data Output Voltage - High V
Receiver Sensitivity to Average P
Modulated Optical Power 1 mm POF
Receiver Sensitivity to Average P
Modulated Optical Power 200 µm HCS
Receiver Overdrive Level of Average P
Modulated Optical Power 1 mm POF
Receiver Overdrive Level of Average P
Modulated Optical Power 200 µm HCS
Receiver Application Circuit Current I
Consumption
Notes:
4. Performance in response to a signal from the transmitter driven with the recommended circuit at 1-125 MBd over 1 meter of plastic
optical fiber or 1 meter of HCS® fiber with F07 plugs.
5. Terminated through a 50 Ω resistor to VCC - 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.
[4]
of the receiver in the recommended application circuit (Figure 1); 1-125 MBd, 25°C unless
Parameter Symbol Typical Unit Condition Note
V
OL
OH
min
min
max
max
CC
-1.7 V RL = 50 Ω Note 5
CC
V
-0.9 V RL = 50 Ω Note 5
CC
-27.5 dBm 50% eye opening Note 2
-28.5 dBm 50% eye opening Note 2
-7.5 dBm 50% eye opening Note 2
-10.5 dBm 50% eye opening Note 2
85 mA RL = ∞ Figure 1
T
9
Q2 BASE
8
Q1 BASE
7
T
6
RX V
5
NC
4
PIN 19 10H116
3
PIN 18 10H116
2
R
1
J1
X VEE
X VCC
X VEE
L1
CB70-1812
C1
0.001
R691R7
CC
+
C20
10
C19
0.1
V
BB
R22
1K
R24
1K
MC10H116FN
18
19
15
U4C U4A U4B
17
C15
0.1
C18
0.1
R25
1K
R23
1K
V
BB
RX GND
R5
22
Q1
MPS536L
91
C16
0.1
C2
0.1
Q2
MPS536L
1
U1A
2
74ACTQ00
C17
0.1
R18
51
MC10H116FN MC10H116FN
10 14
7
4
5
3
R19
20
51
R20
12
R21
62
2
V
CC
U5
TL431
3
R16
51
R17
V
CC
9
10
7
12
13
4
5
V
3V
V
9
8
51
3 V
+
C14
10
14
U1C
74ACTQ00
U1D
74ACTQ00
U1B
74ACTQ00
CC
BB
13
12
8
11
6
R14
1K
C3
0.1
C10
0.1
R15
1K
C13
0.1
C4
0.001
Q3
2N3904
C8*
R12
4.7
R13
4.7
C12
0.1
C11
0.1
V
BB
+
C5
10
C9
47
C6
0.1
R8*
R9*
R10
15
THE VALUES OF R8, R9, R11, AND
C8 ARE DIFFERENT FOR POF AND
HCS DRIVE CIRCUITS.
POF
180
R8
180
R9
820
R11
62 pF
C8
R11*
HCS
82
82
470
120 pF
C7
0.001
UNLESS OTHERWISE NOTED,
ALL CAPACITOR VALUES
ARE IN µF WITH ± 10%
TOLERANCE AND ALL
RESISTOR VALUES ARE IN
Ω WITH ± 5% TOLERANCE.
10
1
RX OUT
2
RX GND
3
RX GND
4
RX V
CC
5
GND
6
GND
7
ANODE
8
CATHODE
9
TOLERANCE
1%
1%
1%
5%
U22
Figure 1. Transmitter and Receiver Application Circuit with +5 V ECL Inputs and Outputs.
168