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

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

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

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

F,H

F,L

Optical Overshoot - 200 µm HCS 30 % Transmitter Application Circuit I

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:

@ 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

min

max

-1.7 V RL = 50 Ω Note 5

-0.9 V RL = 50 Ω Note 5

-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

Q2 BASE

Q1 BASE

RX V

PIN 19 10H116

PIN 18 10H116

X VEE

X VCC

X VEE

L1 CB70-1812

0.001

R691R7

C20

C19

0.1

R22

R24

MC10H116FN 18

U4C U4A U4B

C15

0.1

C18

0.1

R25

R23

RX GND

R5 22

Q1 MPS536L

C16

0.1

Q2 MPS536L

U1A

74ACTQ00

C17

0.1

R18

MC10H116FN MC10H116FN

10 14

R19

R20

R21

TL431

R16

R17

12 13

4 5

9 8

3 V

C14

U1C 74ACTQ00

U1D

74ACTQ00

U1B

74ACTQ00

13 12

R14

0.1

C10

0.1

R15

C13

0.1

0.001

2N3904

C8*

R12

4.7

R13

4.7

C12

0.1

C11

0.1

C5 10

C9 47

0.1

R8*

R9*

R10

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

POF 180

180

820

R11

62 pF

R11*

HCS 82 82 470 120 pF

0.001

UNLESS OTHERWISE NOTED, ALL CAPACITOR VALUES ARE IN µF WITH ± 10% TOLERANCE AND ALL RESISTOR VALUES ARE IN Ω WITH ± 5% TOLERANCE.

RX OUT

RX GND

RX V

GND

ANODE

CATHODE

TOLERANCE 1% 1% 1% 5%

U22

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

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