SMI Transceiver DC-10 MBd
The SMI Transceiver DC-10 is optimized for DC to 10
MBd data transmission providing 100m of link length
[1]
over Step Index POF (NA 0.5) and is ideal for non-
proprietary protocols requiring low-speed transmission
up to 10 MBd
Packaged in an easy to use SMI housing, the Molex SMI Transceiver DC-10 uses a highly reliable
RCLED (Resonant cavity light emitting diode) SMI transmitter and an SMI receiver based on a fully
integrated differential photo-diode and TIA with limiting amplifier.
The transmitter can be driven from 5V TTL type logic drivers and the receiver is a single-ended TTL/
CMOS 5V type output. Both transmitter and receiver operate over the industrial temperature range of
-40 to +85°C.
The receiver is a robust optical to electrical receiver with integrated pulse width distortion minimization
circuitry for reliable data transmission. The receiver features a push-pull TTL compatible CMOS output.
The transmitter and receiver are typically used at 9600 Baud in RS232 or RS485 protocols but support
up to 10 MBd over POF in industrial serial bus protocol links.
Note: 1. Link length depends on ambient temperature and the installation conditions.
Industrial
Drives and frequency inverters
Renewable energies
Transportation
Power T&D
Factory automation
Galvanic isolation
Medical
Applications
Optimized for data transmission from DC to 10 MBd
Visible LED at red wavelength (650 nm)
Industrial temperature range -40 to +85°C
5V TTL/CMOS compatible
Low-speed serial RS232, RS485, CAN Bus,
Modbus, Profibus
Designed for applications requiring low-speed
transmission that do not need to be compliant to a
dedicated standard e.g. Ethernet
Enables visual inspection of link functionality (red,
visible light); advantage vs. copper or IR LED/laser
Meets broad temperature range demands of most
of harsh industrial applications (e.g. offshore wind
farms, tractions in very cold environment)
Facilitates ease of design
Various standards supported
Features and Benets
PRELIMINARY
Transmitter and Receiver Absolute Maximum Ratings
Transmitter Electrical and Optical Characteristics
Parameter Symbol Min. Max. Unit
Storage Temperature T
stg
-40 85 ˚C
Operating Temperature T
op
-40 85 ˚C
Soldering Temperature
[1]
T
sld
+260
[1]
˚C
Tx Reverse Input Voltage V
BR
5 V
Tx Peak Forward Input Current
[2]
I
FPK
40 mA
Tx Average Forward Input Current
[2]
I
FAVG
20 mA
Storage Compliance (Tx, Rx) MSL 2a J-STD-020D
Rx Supply Voltage Vcc -0.5 5.5 V
Rx Output Current I
OAVG
-16 16 mA
Parameter Symbol Min. Typical Max. Unit Test Condition
Average Optical Power AOP
-3 2 4 dBm 1 mm POF, I
FAVG
= 15 mA
-9 -3 -1 dBm 1 mm POF, I
FAVG
= 5 mA
Emission Wavelength
(centroid)
[3]
λ
c
640 660 680 nm I
FDC
= 30 mA
Spectral Width (RMS)
[4]
λ
RMS
11 20 nm I
FDC
= 30 mA
Forward Voltage V
F
1.4 1.95 2.4 V I
FDC
= 30 mA
Forward Voltage Temperature Coefficient Δ V
F
/ΔT -3.5 mV/˚C I
FDC
= 30 mA
Reverse Input Breakdown Voltage V
BR
20 V I
FDC
= -1 μA
Diode Capacitance C
o
11 pF V=0 V
Data Rate DC 10 MBd
Optical Rise Time (20%-80%) t
r
5 7 ns I
FAVG
= 15 mA
[2]
Optical Fall Time (80%-20%) t
f
7 9 ns I
FAVG
= 15 mA
[2]
Propagation Delay Low-to-High
(Electrical-to-Optical)
PropDly_
LH
18 22 28 ns I
FAVG
= 15 mA
[2]
Propagation Delay High-to-Low
(Electrical-to-Optical)
PropDly_
HL
16 24 36 ns I
FAVG
= 15 mA
[2]
Pulse Width Distortion PWD -2 2 8 ns I
FAVG
= 15 mA
[2]
SMI Transceiver DC-10 MBd
These are the absolute maximum ratings at or beyond which the FOT can be expected to be damaged.
Notes:
1. Soldering temperature is recommended to be 260 °C for 10 sec, one time only, at least 2.2 mm away from lead root.
2. When peak forward current exceeds 20 mA then the duty cycle must maintain a pulse width (PW) less than 1 μs and average forward current less than or equal to 20 mA.
[20 mA ≤ I
FPK
≤ 40 mA ↔ I
FAVG
≤ 20 mA AND PW ≤ 1 μs].
Test Conditions:
1. Test data was validated over the full temperature range of -40°C to +85°C, and over the full drive current range.
2. Average Optical power for POF is measured when coupled into 1 m of a 1 mm diameter 0.5 NA POF and a large area detector for 50% duty cycle data using the given application circuit (inverting) as shown on page 5.
3. Emission Wavelength (centroid) λ
c
= Ʃ
i
P
i
. λ
i
/ Ʃ
i
P
i
. (Ref: EIA/TIA std. FOTP-127/6.1, 1991)
4. Spectral Width Root Mean Squared (RMS) λ
RMS
= (Ʃ
i
P
i
(λ
c
– λ
i
)
2
/ Ʃ
i
P
i
)
1/2
. (Ref: EIA/TIA std. FOTP-127/6.3, 1991)
PRELIMINARY