FT50MxxR
650 nm DC-50 MBd
Fully Integrated RedLink®
Fiber Optic Transmitter
Datasheet
FT50MxxR Revision E
1
DESCRIPTION
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 °C to +85 °C. 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 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)
• Optimised for data rates from DC to 50 MBd
• Industrial Temperature Range -40 °C to +85 °C
• 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
• Horizontal, Vertical and 30° Tilted options
• 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 E
2
SPECIFICATIONS
IC
1, V
CC
3, GND
4, 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
Storage Compliance MSL J-STD-020 2a (4-week floor life)
Restriction of Hazardous
Substances Directive
RoHS
Directive 2011/65/EU
Incl. Amendment 2015/863
Certified compliant
Eye Safety
IEC 60825-1 LED Class 1
RECOMMENDED APPLICATION CIRCUIT
1
3
4
100 nF
V
CC
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 V
CC
2 NO PIN PRESENT
3 GROUND GND
4 DATA INPUT (TTL) D+
5 RETAINING PIN GND
8 RETAINING PIN GND