FT50MHNRFT50MHIRFT50MVNRFT50MVIR

650nmDC‐50MBd

FullyIntegratedRedLink®

FiberOpticTransmitter



DataSheet

FT50MHNRFT50MHIRFT50MVNRFT50MVIRRevisionP2

1



DESCRIPTION

The Firecomms DC‐50MBd RedLink transmitter

consists of a highly reliable Resonant Cavity Light

EmittingDiode(RCLED)withintegrateddriverICas

avisibleopticaltransmitter.Thedeviceishousedin

aminiaturepackagetointerfacetoplug‐terminated

lengthsofPlasticOpticFiber(POF)or200μmPlastic

Clad

Silica(PCS)fiber.Itiscapableofdelivering50

MBd digital signals over fiber and operate in the

temperaturerangeof‐40⁰Cto+85⁰C.Thedevice

can operate from 5V or3.3V DC power rails and

cantolerate±10%supplyvariation.



The transmitter contains

 a red wavelength RCLED

withfullyintegratedprecisiondriverIC,designedto

provideacommu nicationlinkoverPOF.TheRCLED

inisahighlyreliablevisibleincoherentlightsource

requiring low operating current. The use of

intrinsicallyeye‐safe,visiblelightsimplifieslinkset‐

upandtesting.Itisavailable

ininvertingandnon‐

invertingoptions.



AVAILABLEOPTIONS

Table1

ORDERINGINFORMATION/PARTNUMBERS

50MBdHorizontalPackage

Non‐Inverting,TTL

FT50MHNR

50MBdHorizontalPackage

Inverting,TTL

FT50MHIR

50MBdVerticalPackage

Non‐Inverting,TTL

FT50MVNR

50MBdVerticalPackage

Inverting,TTL

FT50MVIR

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FEATURES

 VisibleRCLEDatredwavelength(650nm)

 OptimizedfordatatransmissionfromDC‐50

MBd

 IndustrialTemperatureRange‐40⁰Cto+85⁰C

 Dual5Vand3.3Vpowersupplywith10%rail

tolerance

 RoHScompliantandflameretardant

(UL94V‐0)

 InvertingandNon‐Invertingoptionsavailable

 HorizontalandVerticaloptionsavailable

 PushPullTTLCompatibleCMOSoutput

 Ultra‐lowpulsewidthdistortiontolimitpulse

distortionfromburstmodedata

 CompatiblewithVersatileLinkcablesand

connectors



APPLICATIONS

Table2

APPLICATIONS

Application

AutomationandIndustrialControl.Serial

Communications.VoltageIsolation.

Standard

SerialRS232,RS485,CAN‐Bus,MODBUS,

Profibus

Distance

50metersStepIndexPOF

[1]

100meterswith200µmPCSfiber

[1]



Speed DCto50MBd

Note:1.Dependingontheinstallationconditions



FT50MHNRFT50MHIRFT50MVNRFT50MVIRRevisionP2

2

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SPECIFICATIONS



1, Vcc

3, Gnd

4, TTL (D+)

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FIGURE1

Transmitterpin‐out,topview

Table4

REGULATORYCOMPLIANCE



Parameter Symbol Standard Level��

ElectrostaticDischarge,

HumanBodyModel(contactESD)

HBM Mil‐STD‐883 Level2(4kV)

ULCertification UL 94V‐0 FilesNo.Pending

StorageCompliance MSL J‐STD‐020E 2a(4‐weekfloorlife)

RestrictionofHazardous

SubstancesDirective

RoHS Directive2011/65/EU Certifiedcompliant

EyeSafety



IEC60825‐1 LEDClass1

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RECOMMENDEDAPPLICATIONCIRCUIT

100 nF

Vcc

TTL / CMOS Input

10 F 10 F

1 H

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FIGURE2

Recommendedtransmitterapplicationcircuit.Seenote7Table6

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

Table3

TRANSMITTERPINDESCRIPTION

Pin Name Symbol

1 LineVoltage Vcc

2 NoPinPresent

3 GROUND GND

4 DataInput(TTL) D+

5 RetainingPin GND

8 RetainingPin GND

 