FT50MxxR
650 nm DC-50 MBd
Fully Integrated RedLink®
Fiber Optic Transmitter
Datasheet
FT50MxxR Revision B
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 communication 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
50 MBd 30⁰ Tilted Package
Non-Inverting, TTL
FT50MWNR
50 MBd 30⁰ Tilted Package
Inverting, TTL
FT50MWIR
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, Vertical and 30⁰ Tilted 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
FT50MxxR Revision B
2
SPECIFICATIONS
IC
1, V
cc
3, Gnd
4, TTL (D+)
8
5
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 60950-1
File No. E362227
Tilted Package: UL Pending
Storage Compliance MSL J-STD-020 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
RECOMMENDED APPLICATION CIRCUIT
1
3
4
100 nF
Vcc
TTL / CMOS Input
10
µ
F 10
µ
F
1
µ
H
IC
8
5
FIGURE 2
Recommended transmitter application circuit. See note 7 Table 6
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