AFBR-2418Z - AVAGO TECHNOLOGIES - Datasheet.Directory

AFBR-24x8xZ

DC-50MBd Miniature Link Fiber Optic Receiver

Data Sheet

Features

• RoHS-compliant

• Work with Avago HFBR-14xxZ (820nm LED) transmitter

• Data transmission at signal rates from DC up to 50 MBd

• Receiver: Integrated PIN diode and digitalizing IC with

CMOS/TTL output logic

• Up to 2 km distance with Multimode Glass Fiber Cable

• Operating temperature range of -40°C to +85°C

• 3.3 V and 5 V supply voltage operation

• RSSI output

Applications

• Optical transmission from DC up to 50 MBd

• Industrial control and factory automation

• High voltage isolation

• Elimination of ground loops

• Reduces voltage transient susceptibility

• Power substation automation

Description

The component is designed to provide cost eective, high

performance ber optic communication links for infor-

mation systems and industrial applications with link dis-

tances of up to 2 km. The receivers are directly compatible

with popular “industry-standard” connectors: ST and SMA.

They are designed for use with 50/125 μm, 62.5/125 μm,

and 200 μm multimode ber.

AFBR-24x8xZ Available Part Numbers

Part Number Description

AFBR-2408Z Receiver with SMA port

AFBR-2418Z Receiver with ST port

AFBR-2418TZ Receiver with threaded ST port

AFBR-2418MZ Receiver with metal ST port

Link Length

Data Rate

(MBd)

Max. Distance

(m)

Fiber Size

(µm) Transmitter

50 900 50/125 HFBR-1414Z

50 2000 62.5/125 HFBR-1414Z

50 100 200 HFBR-1414Z

Note:

Veried with PRBS7 pattern using HFBR-1414Z transmitter, respecting its

worst case LOP conditions but assuming a proper ber connection (direct

connection without add. connectors). Multiple or weak connections may

reduce the achievable link length.

Package and Handling Information

Package Information

The receiver is housed in a low-cost, dual-inline package

that is made of high strength, heat resistant, chemically

resistant, and UL 94V-O ame retardant ULTEM® plastic

(UL File #E121562). The receivers (sux Z, TZ) are easily

identied by the dark grey color connector port. A metal

port option is also available (sux MZ). The metal port op-

tion components have an internal electrical connection

between the metal port and the four grounding pins, as

shown in the package outline drawing. Signal ground is

separate from the four grounding pins to give exibility in

connecting the port to signal or chassis ground. The pack-

age is designed for auto-insertion and wave soldering so

it is ideal for high volume production applications.

Handling and Design Information

Each part comes with a protective port cap or plug cov-

ering the optics. These caps/plugs will vary by port style.

When soldering, it is advisable to leave the protective cap

on the unit to keep the optics clean. Good system per-

formance requires clean port optics and cable ferrules to

avoid obstructing the optical path. Clean compressed air

often is sucient to remove particles of dirt; methanol on

a cotton swab also works well.

AFBR-24x8xZ Low-Cost 50 MBd Receiver

Description

The AFBR-24x8xZ ber optic receiver is designed to oper-

ate with the Avago Technologies HFBR-14xxZ ber optic

trans-mitters and multimode glass ber cable. Consistent

coupling into the receiver is assured by the optical system

with lens. The receiver output is a digital CMOS/TTL signal.

The AFBR-24x8xZ receiver contains an IC with integrated

photodiode which directly converts the incoming opti-

cal signal to a digital output signal without the requisite

for additional external circuitry. Because of its integrated

design, the receiver has very high EMC resistance. A wide

receiver dynamic range and high sensitivity over tempera-

ture is achievable. The data rate typically goes from DC to

50MBd. A monitor (RSSI) output, which delivers an output

current proportional to the average incoming light power,

is available.

For an almost noise-free RSSI-signal smoothing compo-

nents are recommended. A capacitor in parallel to the re-

sistor on the RSSI output reduces potential high frequency

signal parts. The use of a single 100 nF capacitor for signal

smoothing is sucient in most common applications, as

shown in the Recommended Receiver Circuitry section. If

this RSSI function is not required, the output pin can be

left oating. The RSSI-signal is derived from internal con-

trolling loops; therefore, the typical time constant of pure

RSSI output current without an external lter can be up to

1 ms. This time constant also depends on the actual aver-

age incoming light power.

Absolute Maximum Ratings

Parameter Symbol Min Max Unit Notes

Storage Temperature TS-40 +85 °C

Operating Temperature TA-40 +85 °C

Supply Voltage VCC -0.3 5.5 V

Maximum DC Output Current IO10 mA

Voltage at RSSI Output VRSSI -0.3 VCC+0.3 V

Lead Soldering Cycle - Temp TSOLD 260 °C 1.6 mm below seating plane

Lead Soldering Cycle - Time tSOLD 10 s

Electrical/Optical Characteristics

-40° C to +85° C, 3.135 V < VCC < 5.25 V

Parameter Symbol Min Typ [1] Max Unit Condition Notes

Optical Input Peak Power Range

(50 MBd proprietary)

PIN-50 -24 +1 dBm DR=50MBd 2, 3, 4

Optical Spectrum Range λIN 792 820 865 nm peak wavelength

Data Rate DR DC 50 MBd

Supply Voltage VCC 3.135 5.25 V

Supply Current ICC 20 30 mA RL=2kΩ

High Level Output Voltage VOH 2.4 VCC-0.3 VCC V RL=2kΩ

Low Level Output Voltage VOL 0.2 0.4 V RL=2kΩ

Output Rise Time (10-90%) tR5 ns CL=10pF 2, 4

Output Fall Time (90-10%) tF5 ns CL=10pF 2, 4

Pulse Width Distortion PWD -4 +4 ns 4, 8

Pulse Width Distortion

1st to 3rd pulse

PWDINIT -5 +8 ns 6, 7, 8

Propagation Delay tRD 40 ns 8

RSSI Output Responsivity IRSSI/PIN 0.72 A/W 5

Voltage at RSSI Output VRSSI 0 VCC-1 V

Notes:

1. Typical data are at 25° C, VCC = 5.0 V.

2. In recommended receiver circuit, with an optical signal from the recommended transmitter circuit, transmitted via 62.5/125μm MM ber.

3. Condition for sensitivity limit: Total Jitter ≤ 0.6 UI (unit intervals). The sensitivity was characterized by usage of transmitter HFBR-1414Z, an optical

attenuator for the particular power setting and a short piece of ber (a few meters). The use of long ber connections up to max. link length, as

specied in the table “Link Length” on page 1, may reduce the sensitivity.

4. Veried with a PRBS7 signal with mark ratio = ½ running at 50 MBd (in this case, the optical input average power levels are 3dB less than the

specied peak power levels).

5. Veried with an external resistor RRSSI=2 kΩ

6. If the data rate was below 1 MBd, the pulse width distortion would be equal to the pulse width distortion of the 1st to 3rd pulses for higher data

rates.

7. The threshold of the 1st pulse of a data sequence is dicult to adjust and therefore the pulse width distortion up to the 3rd pulse is higher than

for all other pulses (worst case for the 1st pulse). This strongly depends on the quality of the rising and falling edge of the optical input. The faster

the edges the smaller the pulse width variation. Furthermore lower data rates would result in the same issue as all the pulse become 1st pulses

8. The AFBR-24x8xZ is an inverting receiver, hence a logic high at the input (light on) causes a logic low at the electrical data output. Respectively, a

rising input edge causes a falling output edge and vice versa.

Note:

To provide a suitable monitoring voltage, choose the value of RRSSI according to the particular optical power situation. For the characterization of

the responsivity, 2 kΩ was used. The lower the power, the higher the resistor value should be. Do not, however, override the max. limit of VRSSI.

Figure 2. Typical Responsivity vs. Temperature

Figure 1. Typical RSSI output voltage across RRSSI = 2 kΩ

RSSI

- mV

- OPTICAL INPUT POWER - dBm

IRSSI/PIN - A/W

T - TEMPERATURE - °C

100

1000

-30 -20 -10 0

0.4

0.5

0.6

0.7

0.8

0.9

-50 0 50 100

85°C

25°C

-40°C

Recommended Circuitry

Recommended Transmitter Driver Circuitry for AFBR-24x8xZ receivers using HFBR-14x4xxZ

R1 R2 R3 C3

33 Ω33 Ω270 Ω75 pF

Monitoring

PHY

10 µF

1 µH

GND

100 nF

GND GND

RXVCC

VCC 3

DO 2

GND 7

RSSI 6

AFBR-24x8xZ

RRSSI

L1 C2

VRSSI

100 nF

GND

Data

74ACTQ00MTC

GND

TXVCC = 5.0V

GND GND

HFBR-14x4xxZ

AN2

AN7

CAT

AN6

IC1A

IC1B

10 8

IC1C

13 11

IC1D

C1 C2

10 µF 100 nF

Pin Description

Pin Name Function Notes

1 NC NC 1

2 /DO Data Out inverted (CMOS/TTL logic) 2

3VCC 5V/3.3V Supply Voltage

4 NC NC 1

5 NC NC 1

6 RSSI Received Signal Strength Indicator Output

7 GND Ground

8 NC NC 1

Notes

1. Pins 1, 4, 5 and 8 are connected together internally. The metal port option components (sux MZ) have an internal electrical connection between

the metal port and the four grounding pins

2. The data output provides an inverted signal, thus an electrical low in case of light on and vice versa.

PIN NO. 1 INDICATOR

BOTTOM VIEW

Mechanical Dimensions – SMA Port

AFBR-2408Z

Mechanical Dimensions – ST Port

AFBR-2418Z

6.35

(0.25)

2.54

(0.10)

3.81

(0.15)

6.4

(0.25) DIA.

12.7

(0.50)

12.7

(0.50)

22.2

(0.87)

5.1

(0.20)

10.2

(0.40)

3.6

(0.14)

1.27

(0.05)

2.54

(0.10)

PINS 1,4,5,8

0.51 X 0.38

(0.020 X 0.015)

PINS 2,3,6,7

0.46

(0.018) DIA.

PIN NO. 1

INDICATOR

1/4 - 36 UNS 2A THREAD

COUNTRY

AVAGO

RX YYWW

AFBR-2408Z

Note: Dimensions are in millimeters (inches).

8.3

(0.32)

6.35

(0.25)

12.7

(0.50)

27.2

(1.07)

5.1

(0.20)

10.2

(0.40)

3.6

(0.14)

1.27

(0.05)

2.54

(0.10)

PINS 1,4,5,8

0.51 × 0.38

(0.020 × 0.015)

PINS 2,3,6,7

0.46

(0.018) DIA.

PIN NO. 1

INDICATOR

2.54

(0.10)

3.81

(0.15)

DIA.

12.7

(0.50)

7.0

(0.28)

COUNTRY

AVAGO

RX YYWW

AFBR-2418Z

4.9

(0.193) MAX.

5.1

(0.20)

3/8 - 32 UNEF - 2A

8.4

(0.33)

6.35

(0.25)

12.7

(0.50)

27.2

(1.07)

5.1

(0.20)

10.2

(0.40)

3.6

(0.14)

1.27

(0.05)

2.54

(0.10)

PINS 1,4,5,8

0.51 × 0.38

(0.020 × 0.015)

PINS 2,3,6,7

0.46

(0.018) DIA.

PIN NO. 1

INDICATOR

2.54

(0.10)

3.81

(0.15)

DIA.

12.7

(0.50)

7.1

(0.28)

DIA.

7.6

(0.30)

4.9

(0.193)

COUNTRY

AVAGO

RX YYWW

AFBR-2418TZ

MAX.

For product information and a complete list of distributors, please go to our web site: www.avagotech.com

Avago, Avago Technologies, and the A logo are trademarks of Avago Technologies in the United States and other countries.

AV02-4303EN - October 11, 2013

Mechanical Dimensions – Threaded ST Port

AFBR-2418TZ

Mechanical Dimensions – Metal ST Port

AFBR-2418MZ

PIN NO. 1

INDICATOR

PINS 1,4,5,8

0.51 × 0.38

(0.020 × 0.015)

PINS 2,3,6,7

0.46 DIA.

(0.018) DIA.

COUNTRY

AVAGO

RX YYWW

AFBR-2418MZ

4.9

(0.193)

8.4

(0.33)

6.35

(0.25)

5.1

(0.20)

10.2

(0.40)

3.6

(0.14)

1.27

(0.05)

2.54

(0.10)

12.7

(0.50)

27.2

(1.07)

12.7

(0.50)

2.54

(0.10)

3.81

(0.15)

DIA.

7.0

(0.28)

MAX.

Note: Dimensions are in millimeters (inches).