SFH551/1-1 - Broadcom

Features

 Bipolar IC with open-collector output

 Digital output, full TTL compatible

 Sensitive in visible and near IR range

 Transfer rate ≤ 5MBd

 Low switching threshold

 2.2mm aperture holds standard 980/1000/2200μm

plastic  bers

 No  ber stripping required

 Molded microlens for e cient coupling

Plastic Direct Fiber Connector housing (V-housing)

 Locking screw attached to the connector

 Interference-free transmission by the light-tight

housing

 Transmitter and receiver can be positioned  exibly

 No cross talk

 Auto insertable and wave solderable

 Supplied in tubes

Applications

 Household electronics

 Power electronics

 Optical networks

Application Literature

AN # Description

5342 General information about the SFH series

with Selection Guide and recommendations

regarding System Planning and Mounting

5341 Information about Basic and Special Circuits for

Transmitter and Receiver of the SFH series

Description

The SFH551/1-1 receiver is a transimpedance ampli er

with an integrated photodiode and TTL open-collector

output stage. The active area of this detector combined

with the molded microlens gives an e cient coupling

from the end of the polymer optical  ber. This receiver

enables data rates up to 5 MBd and works with the Avago

SFH757 transmitter diode.

The SFH551/1-1 is fully DC coupled and therefore no

line code is needed. The internal Schmitt trigger ensures

stable output states over the whole dynamic range. If

light with intensity above the threshold level is coupled

into the SFH551/1-1, the electrical output will be logical

“low” and vice versa.

With noisefree Vcc and GND, an unde ned output signal

is not possible. Nevertheless, the SFH551/1-1 must not

be used without shielding from ambient light. If ambient

light could reach the threshold level, the SFH551/1-1V

component should be chosen. The plastic connector

housing of the SFH V-series shields the ambient light

perfectly.

SFH series components are optimized for easy coupling.

No  ber stripping is required; just insert the cut  ber into

the selected SFH component.

Ordering Information

SFH551/1-1 and SFH551/1-1V

Receiver with Digital Output Stage

for Polymer Optical Fiber Applications

Data Sheet

SFH551/1-1 SFH551/1-1V

Type Ordering Code

SFH551/1-1 SP000063860

SFH551/1-1V SP000063855

Package Dimensions

SFH551/1-1

SFH551/1-1V

Figure 1. Equivalent circuit diagram (simpli ed)

Dimensions in mm

Rpullup

GND

Data-out

VCC

SFH551/1-1

The transparent plastic package has an aperture where a

2.2 mm  ber end can be inserted. This coupling method

is very easy and extremely cost-e ective.

SFH551/1-1V

The V-housing allows easy coupling of unconnectorized

2.2 mm polymer optical  ber by an axial locking screw.

The SFH551/1-1 receiver is a transimpedance ampli er

with a TTL open-collector output stage, therefore a

pull-up resistor of at least 330 Ω is necessary (see Figure

1). To minimize interference a bypass capacitor (100 nF)

must be placed near (distance ≤ 3 cm) the SFH551/1-1

ports. In critical applications a shorter distance is better.

Functionality

The SFH551/1-1 photodiode is silicon based and directly

connected to a transimpedance ampli er that works as

a pre-ampli er. A di erential ampli er is connected in

series and works as a post-ampli er. Its output is passed

to the internal Schmitt trigger that drives a bipolar NPN

transistor. The data-out signal is from the collector of this

bipolar transistor.

surface not at

24.5

0.5

view from A

1.5

0.55

0.5

Vcc GND DATA

5.3

12.2

0.55

∅ 2.275

8.6

7.65

4.6

∅ 4.625

2.542.54

locking screw

24.0

13.5

3.5

spacing

0.5 ∅ 0.6

SFH551/1-1

component

9.0

DATA

0.55

8.8

4.8

0.5

Vcc GND DATA

2.54

5.08

7.62

Technical Data

Absolute Maximum Ratings

Parameter Symbol Min Typ Max Unit Notes Figure

Operating Temperature range TC-40 +85 °C

Storage Temperature range Tstg -40 +100 °C

Supply Voltage Range without Damage VCC -0.5 15 V

Soldering Temperature (2mm from case bottom, t≤5s) TS+260 °C

Minimum Supply Voltage for Function VCC min 4V

Minimum Pullup Resistance (Vcc=5.0V) Routmin 330 Ω 1

Output Voltage VO-0.5 15 V

Output Current IC50 mA

Power Dissipation (Output) PO100 mW

Electrostatic Discharge Voltage Capability ESD 2000 V 1

Electrostatic Discharge Voltage Capability ESD 400 V 2

Notes:

1. ESD Capability for all Pins HBM(Human Body Model) according JESD22-A114

2. ESD Capability for all Pins MM (Machine Model) according JESD22-A115

Package V-housing Color

SFH V-series components are color coded just like other

Avago  ber optic components. The SFH757V transmitter

has a white colored housing; the SFH250V and SFH551/1-

1V receiver components have a black colored housing.

This prevents mistakes while making connections.

Product designation and date of manufacture are printed

on the housing.

Package V-housing mounting pins

SFH V-series components have two pins that are electri-

cally isolated from the inner circuit. The pins are only

designed for mounting the V-housing to the PCB surface.

This helps increase stability, which is needed during

 xing the  ber end by the axial locking screw.

The retention force between the soldered mounting pins

and the V-housing of the SFH component is about 20 N

(with a vertical exertion of force). This is an approximate

value.

Package V-housing axial locking screw

Components of the SFH V-series are equipped with an

axial locking screw for easy coupling to the unconnec-

torized 2.2 mm polymer optical  ber. The force that is

necessary to pull a jammed  ber out of the V-housing is

typically 50 N (with a torque of 15 cNm for tightening the

locking screw). This is an approximate value that is very

dependent on the  ber and torque combination.

Package V-housing mounting pins Package V-housing axial locking screw

Characteristics (TA = -40°C to +85°C; Vcc = 4.75V to 5.25V) unless otherwise speci ed

Parameter Symbol Min Typ* Max Unit Notes Figure

Maximum Photosensitivity Wavelength smax 700 nm

Photosensitivity Spectral Range (S=80% of Smax) s600 780 nm

Mean POF Overdrive Limit:

Maximum Input ( = 650 nm)

PIN(max) 252

-6

1000

μW

dBm(mean) 5, 7, 8 4

Peak POF Sensitivity Limit:

Minimum Input for Logic “0” ( = 650 nm)

PIN(L) 20

-17

6.3

-22

μW

dBm

4, 5

Peak POF O State Limit:

Maximum Input for Logic “1” ( = 650 nm)

PIN(H) 0.1

-40

μW

dBm

4, 5

Propagation Delay (Input: Pattern “1010”, 5MBd)

(Optical Input to electrical Output)

tPHL

tPLH

120

270

1, 6

2,3,4

Output Voltage at Logic “1” VOH Vcc-0.6 Vcc-0.3 V 3

Output Voltage at Logic “0” VOL 0.2 0.6 V 3

Switching times (Input: Pattern “1010”, 5MBd)

Output Rise time (10% - 90%)

Output Fall time (90% - 10%)

2, 3, 6

Current Consumption

(Input: Pattern “1010”, 5MBd)

Icc 8 14 20 mA 3, 6

Current Consumption (Logic“1”, Light OFF) IccH 1.5 3.5 6.5 mA 3

Current Consumption (Logic“0”, Light ON) IccL 13 17.5 23 mA 3

* Typical value = mean value at TA=25°C and Vcc=5. 0V

Notes:

1. PWSFH_output = PWopt_input + (tPLH – tPHL); PW = pulse width

2. Switching times increase with temperature

3. Measured with recommended Rpullup = 330Ω (see Figure 1)

4. Sensitivity increase with temperature

5. ValuedBm=10*log(Valuemeasured / 1mW)

6. Limits valid for optical input power from -20dBm(mean) to -9dBm(mean)

7. dBm(peak) = dBm(mean) + 3dB

8. PWD ≤ 170ns; Input: Pattern “1010”, 5MBd

PW*SFH_output = PW*opt_input + (tPLH – tPHL)

PWD*= (tPLH – tPHL)

*PW=pulse width, *PWD=pulse width distortion

tPHL tPLH

VOL

VOH

PWopt_input

PWSFH_output

OPTICAL

INPUT

OUTPUT

SFH551/1-1

Light o

Light on

Figure 2. Typical corresponding optical input to electrical output signal

100

150

200

250

-28-26-24-22-20-18-16-14-12-10 -8 -6

Propagation delay in ns

Optical Input Power in dBm (mean value)

Propagation Delay

tPHL -40°C

tPHL 25°C

tPHL 85°C

-20

100

120

140

160

-28 -26 -24 -22 -20 -18 -16 -14 -12 -10 -8 -6

Pulse Width Distortion in ns

Optical Input Power in dBm (mean value)

Pulse Width Distortion

PWD at -40°C

PWD at 25°C

PWD at 85°C

tPLH -40°C

tPLH 25°C

tPLH 85°C

Figure 3. Typical Propagation delay, measured with Pattern “1010” at 5 MBd

Figure 4. Typical Pulse Width Distortion, measured with Pattern “1010” at 5 MBd

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AV02-3033EN - October 25, 2011