HP HFBR-1537, HFBR-1527, HFBR-2536, HFBR-2526, HFBR-0507 Datasheet

125 Megabaud Versatile Link
The Versatile Fiber Optic
Connection

Technical Data

Features

• Data Transmission at Signal
Rates of 1 to 125 MBd over
Distances of 100 Meters

• 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: Board­to-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
Susceptibility

Description

The 125 MBd Versatile Link
(HFBR-0507 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-15X7, and a
PIN/preamp receiver, HFBR­25X6. 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-15X7 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

HFBR-0507 Series
HFBR-15X7 Transmitters
HFBR-25X6 Receivers

and 200 µm Hard Clad Silica
(HCS®) fiber. With the recom­mended drive circuit, the LED
operates at speeds from 1-125
MBd. The HFBR-25X6 is a high
bandwidth analog receiver con­taining 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 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-0507
Series to optimize performance
and cost at higher and lower data
rates.

HCS® is a registered trademark of Spectran Corporation.

5965-6114E (1/97)

17

HFBR-0507 Series
125 MBd Data Link

Data link operating conditions
and performance are specified for
the HFBR-15X7 transmitter and
HFBR-25X6 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 Reference

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 % Note 2

070°C

+4.75 +5.25 V

V

-1.89 V

CC

V

-1.06 V

CC

-1.62 V

CC

-0.70 V

CC

45 55 Ω Note 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 Note 5,6,7

3 6 dB Note 5,6,7

Typ.

[4]

Max. Unit Condition Reference

20 m Standard POF

Link Distance with l 20 27 m

Standard 1 mm POF

Optical Power Margin, OPM

POF,25

3 6 dB Note 5,6,7

25 m Low Loss POF

Link Distance with Extra l 25 32 m

Low Loss 1 mm POF

Optical Power Budget, 1 m HCS OPB
Optical Power Margin, OPM

HCS

HCS,100

7 12 dB Note 5,6,7
3 6 dB Note 5,6,7

100 m HCS

Link Distance with HCS Cable l 100 125 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 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-15X7 transmitter, HFBR-25X6 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 longterm LED LOP degradation and additional fixed passive losses (such as in-line connectors) in addition to the
minimum specified distance.

CC

- 2 V.

18

Plastic Optical Fiber (1 mm POF) Transmitter Application Circuit:

Performance of the HFBR-15X7 transmitter in the recommended application circuit (Figure 1) for POF; 1­125 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
19 mA Note 3

3 mA Note 3
Optical Overshoot - 1 mm POF 45 %
Transmitter Application Circuit I

CC

110 mA Figure 1

Current Consumption - 1 mm POF

Hard Clad Silica Fiber (200 µm HCS) Transmitter Application Circuit: Performance of

the HFBR-15X7 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 HFBR-15X7 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

19

Plastic and Hard Clad Silica Optical Fiber Receiver Application Circuit:

Performance
25°C unless 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 HFBR-15X7 transmitter driven with the recommended circuit at 1-125 MBd over 1 meter
of HFBR-R/EXXYYY plastic optical fiber or 1 meter of HFBR-H/VXXYYY hard clad silica optical fiber.

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. Refer to Applications Note 1066 for
design guidelines.

[4]

of the HFBR-25X6 receiver in the recommended application circuit (Figure 1); 1-125 MBd,

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 U3

17

C15

0.1

C18

0.1

R25

1K

R23

1K

V

BB

R5
22

Q1
BFQ52

C16

C2

0.1

Q2
BFQ52

1

U1A

2

91

R18

51

MC10H116FN MC10H116FN

0.1

R19

51

R20

12

R21

62

74ACTQ00

C17

0.1

10 14

7

4

5

3

20

2

V

CC

U5

TL431

3

R16

R17

V

CC

9

10

7

12
13

4
5

V

3V

V

51

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

1
2
3
4

C6

0.1

R8*

R9*

R10

15

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

5

HFBR-25X6

THE VALUES OF R8, R9, R11, AND
C8 ARE DIFFERENT FOR POF AND
HCS DRIVE CIRCUITS.

POF
300

R8

300

R9

1K

R11

43 pF

C8

R11*

HCS
82
82
470
120 pF

1
2

3
4

C7

0.001
8

U2

HFBR-15X7

5

TOLERANCE
1%
1%
1%
1%

Figure 1. Transmitter and Receiver Application Circuit with +5 V ECL Inputs and Outputs.

20