HFBR-2526 - Hewlett-Packard / Agilent

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 Inexpen-

sive, Easily Terminated

Plastic Optical Fiber, and

with Large Core Silica Fiber

• High Voltage Isolation

• Transmitter and Receiver

Application Circuit Sche-

matics 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

• 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, HFBR-

25X6. 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 compo-

nents 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

and 200 µm Hard Clad Silica

(HCS®) fiber. With the recom-

mended drive circuit, the LED

operates at speeds from 1-125

MBd. The HFBR-25X6 is a high

bandwidth analog receiver con-

taining a PIN photodiode and

internal transimpedance amplifier.

With the recommended applica-

tion 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.

HFBR-0507 Series

HFBR-15X7 Transmitters

HFBR-25X6 Receivers

HCS® is a registered trademark of Spectran Corporation.

5965-6114E (1/97)

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 TA070°C

Supply Voltage VCC +4.75 +5.25 V

Data Input Voltage – Low VIL VCC -1.89 VCC -1.62 V

Data Input Voltage – High V

IH VCC -1.06 VCC -0.70 V

Data Output Load RL45 55 ΩNote 1

Signaling Rate fS1 125 MBd

Duty Cycle D.C. 40 60 % Note 2

Link Performance: 1-125 MBd, BER ≤ 10-9, under recommended operating conditions with

recommended transmit and receive application circuits.

Parameter Symbol Min.[3] Typ.[4] Max. Unit Condition Reference

Optical Power Budget, 1 m POF OPBPOF 11 16 dB Note 5,6,7

Optical Power Margin, OPMPOF,20 3 6 dB Note 5,6,7

20 m Standard POF

Link Distance with l 20 27 m

Standard 1 mm POF

Optical Power Margin, OPMPOF,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 OPBHCS 7 12 dB Note 5,6,7

Optical Power Margin, OPMHCS,100 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 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 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.

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 Pavg -14.6 dBm 50% Duty Note 1, Fig 3

Cycle

Average Modulated Power 200 µm HCS Pmod -16.2 dBm Note 2, Fig 3

Optical Rise Time (10% to 90%) tr3.1 ns 5 MHz

Optical Fall Time (90% to 10%) tf3.4 ns 5 MHz

High Level LED Current (On) IF,H 60 mA Note 3

Low Level LED Current (Off) IF,L 6 mA Note 3

Optical Overshoot - 200 µm HCS 30 %

Transmitter Application Circuit ICC 130 mA Figure 1

Current Consumption - 200 µm HCS

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:

[Pavg @ 80% duty cycle - Pavg @ 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-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.

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

Performance of the HFBR-15X7 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 Pavg -9.7 dBm 50% Duty Note 1, Fig 3

Cycle

Average Modulated Power 1 mm POF Pmod -11.3 dBm Note 2, Fig 3

Optical Rise Time (10% to 90%) tr2.1 ns 5 MHz

Optical Fall Time (90% to 10%) tf2.8 ns 5 MHz

High Level LED Current (On) IF,H 19 mA Note 3

Low Level LED Current (Off) IF,L 3 mA Note 3

Optical Overshoot - 1 mm POF 45 %

Transmitter Application Circuit ICC 110 mA Figure 1

Current Consumption - 1 mm POF

Plastic and Hard Clad Silica Optical Fiber Receiver Application Circuit:

Performance[4] of the HFBR-25X6 receiver in the recommended application circuit (Figure 1); 1-125 MBd,

25°C unless otherwise stated.

Parameter Symbol Typical Unit Condition Note

Data Output Voltage - Low VOL VCC -1.7 V RL = 50 ΩNote 5

Data Output Voltage - High VOH VCC -0.9 V RL = 50 ΩNote 5

Receiver Sensitivity to Average Pmin -27.5 dBm 50% eye opening Note 2

Modulated Optical Power 1 mm POF

Receiver Sensitivity to Average Pmin -28.5 dBm 50% eye opening Note 2

Modulated Optical Power 200 µm HCS

Receiver Overdrive Level of Average Pmax -7.5 dBm 50% eye opening Note 2

Modulated Optical Power 1 mm POF

Receiver Overdrive Level of Average Pmax -10.5 dBm 50% eye opening Note 2

Modulated Optical Power 200 µm HCS

Receiver Application Circuit Current ICC 85 mA RL = ∞Figure 1

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.

0.001 C2

0.1

BFQ52

91 R7

BFQ52

C20

10 C19

0.1

Q2 BASE

Q1 BASE

PIN 19 10H116

PIN 18 10H116

CB70-1812

914

R24

R22

1K R18

51 R16

C17

0.1

C10

0.1

R19

51 R17

51 R15

R23

C18

0.1

R25

1K R20

R21

3 V

C14

TL431

MC10H116FN

C15

0.1 C11

0.1

C16

0.1 C12

0.1

R14

.47

R12

4.7

C13

0.1

HFBR-25X6

R13

4.7

U4C U4A U4B U3

R11*

R10

C8*

74ACTQ00

U1B

74ACTQ00

U1D

74ACTQ00

U1C

R9*

R8*

HFBR-15X7

0.001

0.1

0.001

0.1

2N3904

74ACTQ00

U1A

POF

300

43 pF

R11

HCS

470

120 pF

TOLERANCE

THE VALUES OF R8, R9, R11, AND

C8 ARE DIFFERENT FOR POF AND

HCS DRIVE CIRCUITS.

ALL CAPACITOR VALUES

ARE IN MICRO FARADS,

WITH 10% TOLERANCE

(UNLESS OTHERWISE NOTED).

ALL RESISTANCES ARE IN

OHMS WITH 5% TOLERANCE

(UNLESS OTHERWISE NOTED).

MC10H116FN MC10H116FN

10 14

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

8 TD

9 T

7 TD

6 T

5 R

3 RD

2 RD

82 Ω

10 µF 0.1 µF

4.7 µH

0.1 µF

1 R

+5 V ECL

SERIAL DATA

SOURCE

0.1 µF

82 Ω

120 Ω120 Ω

+5 V ECL

SERIAL DATA

RECEIVER

4.7 µH

10 µF

–

5 V

82 Ω

120 Ω120 Ω

FIBER-OPTIC

TRANSCEIVER

SHOWN IN

FIGURE 1

4.7 µH

Figure 2. Recommended Power Supply Filter and +5 V ECL Signal Terminations for

the Transmitter and Receiver Application Circuit of Figure 1.

Figure 4. Typical Optical Power

Budget vs. Data Rate.

Figure 3. Average Modulated Power.

OPTICAL POWER BUDGET –dB

DATA RATE – MBd

9070 130 150

110

30 50

POF

HCS

AVERAGE POWER – µW

200

100

DUTY CYCLE – %

20 40 80 100

150

AVERAGE POWER,

50% DUTY CYCLE

AVERAGE

MODULATED

POWER

Absolute Maximum Ratings

Parameter Symbol Min. Max. Unit Reference

Storage Temperature TS-40 85 °C

Operating Temperature TO-40 70 °C

Lead Soldering Temperature 260 °C Note 1

10 s

Transmitter High Level Forward IF,H 120 mA 50% Duty Cycle

Input Current ≥ 1 MHz

Transmitter Average Forward Input Current IF,AV 60 mA

Reverse Input Voltage VR3V

125 Megabaud Versatile Link

Transmitter

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.

CAUTION: The small junction sizes inherent to the design of this component increase the component's suscepti-

bility 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.

HFBR-15X7 Series

Description

The HFBR-15X7 transmitters

incorporate a 650 nanometer LED

in a horizontal (HFBR-1527) or

vertical (HFBR-1537) gray

housing. The HFBR-15X7

transmitters are suitable for use

with current peaking to decrease

response time and can be used

with HFBR-25X6 receivers in data

links operating at signal rates

from 1 to 125 megabaud over 1

mm diameter plastic optical fiber

or 200 µm diameter hard clad

silica glass optical fiber. Refer to

Application Note 1066 for details

for recommended interface

circuits.

ANODE 1

CATHODE 2

GROUND 3

GROUND 4

GROUND

SEE NOTE 6

Cycle Time

Electrical/Optical Characteristics 0 to 70°C, unless otherwise stated.

Parameter Symbol Min. Typ.[2] Max. Unit Condition Note

Transmitter Output PT-9.5 -7.0 -4.8 dBm IF,dc = 20 mA, 25°C Note 3

Optical Power, 1 mm POF -10.4 -4.3 0-70°C

Transmitter Output PT-6.0 -3.0 -0.5 dBm IF,dc = 60 mA, 25°C Note 3

Optical Power, 1 mm POF -6.9 -0.0 0-70°C

Transmitter Output PT-14.6 -13.0 -10.5 dBm IF,dc = 60 mA, 25°C Note 3

Optical Power, -15.5 -10.0 0-70°C

200 µm HCS®

Output Optical Power ∆PT-0.02 dB/°C

Temperature Coefficient ∆T

Peak Emission Wavelength λPK 640 650 660 nm

Peak Wavelength ∆λ 0.12 nm/°C

Temperature Coefficient ∆T

Spectral Width FWHM 21 nm Full Width,

Half Maximum

Forward Voltage VF1.8 2.1 2.4 V IF = 60 mA

Forward Voltage ∆VF-1.8 mV/°C

Temperature Coefficient ∆T

Transmitter Numerical NA 0.5

Aperture

Thermal Resistance, θjc 140 °C/W Note 4

Junction to Case

Reverse Input Breakdown VBR 3.0 13 V IF,dc = -10 µA

Voltage

Diode Capacitance CO60 pF VF = 0 V,

f = 1 MHz

Unpeaked Optical Rise tr12 ns IF = 60 mA Figure 1

Time, 10% - 90% f = 100 kHz Note 5

Unpeaked Optical Fall tf9nsI

= 60 mA Figure 1

Time, 90% - 10% f = 100 kHz Note 5

Notes:

1. 1.6 mm below seating plane.

2. Typical data is at 25°C.

3. Optical Power measured at the end of 0.5 meter of 1 mm diameter plastic or 200 µm diameter hard clad silica optical fiber with a large

area detector.

4. Typical value measured from junction to PC board solder joint for horizontal mount package, HFBR-1527. θjc is approximately 30°C/W

higher for vertical mount package, HFBR-1537.

5. Optical rise and fall times can be reduced with the appropriate driver circuit; refer to Application Note 1066.

6. Pins 5 and 8 are primarily for mounting and retaining purposes, but are electrically connected; pins 3 and 4 are electrically

unconnected. It is recommended that pins 3, 4, 5, and 8 all be connected to ground to reduce coupling of electrical noise.

7. Refer to the Versatile Link Family Fiber Optic Cable and Connectors Technical Data Sheet for cable connector options for 1 mm

plastic optical fiber and 200 µm HCS fiber.

8. The LED current peaking necessary for high frequency circuit design contributes to electromagnetic interference (EMI). Care must be

taken in circuit board layout to minimize emissions for compliance with governmental EMI emissions regulations. Refer to Application

Note 1066 for design guidelines.

HP8082A

PULSE

GENERATOR

50 OHM

LOAD

RESISTOR

HP54002A

50 OHM BNC

INPUT POD

HP54100A

OSCILLOSCOPE

BCP MODEL 300

500 MHz

BANDWIDTH

SILICON

AVALANCHE

PHOTODIODE

NORMALIZED SPECTRAL OUTPUT POWER

620

1.2

0.6

WAVELENGTH (nm)

630 650 670 680

1.0

0.2

660

70° C

0.8

0.4

640

25° C

0° C

Figure 2. Typical Spectra Normalized

to the 25°C Peak.

Figure 1. Test Circuit for Measuring

Unpeaked Rise and Fall Times.

Figure 3. Typical Forward Voltage vs.

Drive Current. Figure 4. Typical Normalized Output

Optical Power vs. Drive Current.

– FORWARD VOLTAGE – V

2.4

2.0

1.6

F,DC

– TRANSMITTER DRIVE CURRENT (mA)

10 100

1.8

70° C

2.2 25° C

0° C

– NORMALIZED OUTPUT POWER – dB

-15

-25

F,DC

– TRANSMITTER DRIVE CURRENT (mA)

10 100

-20 70° C

-5

0° C

-10

25° C

Absolute Maximum Ratings

Parameter Symbol Min. Max. Unit Reference

Storage Temperature TS-40 +75 °C

Operating Temperature T

A0 +70 °C

Lead Soldering Temperature 260 °C Note 1

10 s

Signal Pin Voltage VO-0.5 VCC V

Supply Voltage VCC -0.5 6.0 V

Output Current IO25 mA

125 Megabaud Versatile Link

Receiver

CAUTION: The small junction sizes inherent to the design of this component increase the component's suscepti-

bility 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.

HFBR-25X6 Series

Description

The HFBR-25X6 receivers contain

a PIN photodiode and

transimpedance pre-amplifier

circuit in a horizontal (HFBR-

2526) or vertical (HFBR-2536)

blue housing, and are designed to

interface to 1mm diameter plastic

optical fiber or 200 µm hard clad

silica glass optical fiber. The

receivers convert a received

optical signal to an analog output

voltage. Follow-on circuitry can

optimize link performance for a

variety of distance and data rate

requirements. Electrical

bandwidth greater than 65 MHz

allows design of high speed data

links with plastic or hard clad

silica optical fiber. Refer to

Application Note 1066 for details

for recommended interface

circuits.

GROUND

GROUND SEE NOTES 2, 4, 9

GROUND

SIGNAL

Cycle Time

Electrical/Optical Characteristics 0 to 70°C; 5.25 V ≥ VCC ≥ 4.75 V; power supply must be filtered

(see Figure 1, Note 2).

Parameter Symbol Min. Typ. Max. Unit Test Condition Note

AC Responsivity 1 mm POF RP,APF 1.7 3.9 6.5 mV/µW 650 nm Note 4

AC Responsivity 200 µm HCS RP,HCS 4.5 7.9 11.5 mV/µW

RMS Output Noise VNO 0.46 0.69 mVRMS Note 5

Equivalent Optical Noise Input PN,RMS - 39 -36 dBm Note 5

Power, RMS - 1 mm POF

Equivalent Optical Noise Input PN,RMS -42 -40 dBm Note 5

Power, RMS - 200 µm HCS

Peak Input Optical Power - PR-5.8 dBm 5 ns PWD Note 6

1 mm POF

-6.4 dBm 2 ns PWD

Peak Input Optical Power - PR-8.8 dBm 5 ns PWD Note 6

200 µm HCS

-9.4 dBm 2 ns PWD

Output Impedance ZO30 Ω50 MHz Note 4

DC Output Voltage VO0.8 1.8 2.6 V PR = 0 µW

Supply Current ICC 915 mA

Electrical Bandwidth BWE65 125 MHz -3 dB electrical

Bandwidth * Rise Time 0.41 Hz * s

Electrical Rise Time, 10-90% tr3.3 6.3 ns PR = -10 dBm

peak

Electrical Fall Time, 90-10% tf3.3 6.3 ns PR = -10 dBm

peak

Pulse Width Distortion PWD 0.4 1.0 ns PR = -10 dBm Note 7

peak

Overshoot 4 % PR = -10 dBm Note 8

peak

Notes:

1. 1.6 mm below seating plane.

2. The signal output is an emitter follower, which does not reject noise in the power supply. The power supply must be filtered as in

Figure 1.

3. Typical data are at 25°C and VCC = +5 Vdc.

4. Pin 1 should be ac coupled to a load ≥ 510 Ω with load capacitance less than 5 pF.

5. Measured with a 3 pole Bessel filter with a 75 MHz, -3dB bandwidth.

6. The maximum Peak Input Optical Power is the level at which the Pulse Width Distortion is guaranteed to be less than the PWD listed

under Test Condition. PR,Max is given for PWD = 5 ns for designing links at ≤ 50 MBd operation, and also for PWD = 2 ns for

designing links up to 125 MBd (for both POF and HCS input conditions).

7. 10 ns pulse width, 50% duty cycle, at the 50% amplitude point of the waveform.

8. Percent overshoot is defined at: (VPK - V100%)

–––––––––––– × 100%

V100%

9. Pins 5 and 8 are primarily for mounting and retaining purposes, but are electrically connected. It is recommended that these pins be

connected to ground to reduce coupling of electrical noise.

10. If there is no input optical power to the receiver (no transmitted signal) 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

Application Note 1066 for design guidelines.

Figure 1. Recommended Power Supply Filter Circuit.

Figure 2. Simplified Receiver Schematic.

Figure 3. Typical Pulse Width

Distortion vs. Peak Input Power. Figure 4. Typical Output Spectral

Noise Density vs. Frequency. Figure 5. Typical Rise and Fall Time

vs. Temperature..

Versatile Link Mechanical Dimensions

Versatile Link Printed Circuit Board Layout Dimensions

HORIZONTAL MODULES

HFBR-1527

HFBR-2526

HORIZONTAL MODULES

HFBR-1537

HFBR-2526

HFBR-15X7