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D
escription
The IF-D92 is a high-sensitivity NPN phototransistor detector housed in a “connector-
less” style plastic fiber optic package. Optical response of the IF-D92 extends from 400 to
1100 nm, making it compatible with a wide range of visible and near-infrared LEDs and
laser diode sources. This includes 650 nm visible red LEDs used for optimum transmission
in PMMA plastic optic fiber. The detector package features an internal micro-lens and a
precision-molded PBT housing to ensure efficient optical coupling with standard 1000 μm
core plastic fiber cable.
A
pplicAtion
H
igHligHts
A
pplicAtions
➤
Low-Speed Digital Data
Links
➤
Motor Controller Triggering
➤
Audio Links
➤
Medical Instruments
➤
Automotive Electronics
➤
Robotics Communications
➤
EMC/EMI Signal Isolation
➤
Electronic Games
➤
Process Control
The IF-D92 is suitable for digital data links at rates up to 20 kbps. Analog bandwidths
greater than 15 kHz are possible making the IF-D92 usable for high frequency audio
transmission. Phototransistor operation provides high internal gain – reducing the amount
of post-amplification required in many circuits. The integrated design of the IF-D92
makes it a simple, cost-effective solution in a variety of analog and digital applications.
F
eAtures
◆
High Optical Sensitivity
◆
Mates with Standard 1000 um Core, 2.2 mm Jacketed Plastic Fiber Optic Cable
◆
No Optical Design Required
◆
Inexpensive but Rugged Plastic Connector Housing
◆
Internal Micro-Lens for Efficient Optical Coupling
◆
Connector-Less Fiber Termination
◆
Light-Tight Housing provides Interference Free Transmission
◆
RoHS Compliant
M
AxiMuM
r
Atings
(TA =25°C)
Operating and Storage
Temperature Range
(TOP, TSTG)...............-40°to 85°C
Junction Temperature (TJ).........85°C
Soldering Temperature
(2 mm from case bottom)
(TS) t
≤
5 s..........................240°C
Collector Emitter Voltage
(VCEO)..................................30 V
Emitter Collector Voltage
(VECO) .......................................5 V
Collector Current (IC).............50 mA
Collector Peak Current
(ICM) t =1 ms ......................100 mA
Power Dissipation
(PTOT) TA =25°C...........100 mW
De-rate Above 25°C.....1.67 mW/°C
c
HArActeristics
(TA =25°C)
Parameter
Wavelength for Maximum Photosensitivity
Spectral Bandwidth (R=10% of RMAX)
Switching Times (10% to 90% and 90% to 10%)
(RL=1 kΩ, IC=1.0 mA, VCE=5 V,
λ=850
nm)
Responsivity min. @ 870 nm
@ 650 nm
Collector Dark Current (VCE=10 volts)
Breakdown Voltage (IC=100 μA)
Breakdown Voltage (IC= –100 μA)
Saturation Voltage (IC=250 μA, P
in
=100 μW)
Symbol
λ
PEAK
∆λ
tr
tf
Min.
–
-
-
30
5
-
–
400
Typ.
870
–
25
25
Max.
–
-
-
100
-
-
-
1100
Unit
nm
nm
μs
μA/μW
R
BVCEO
BVECO
VCE sat
ICEO
450
350
-
-
0.15
-
nA
V
V
V
CAUTION:
The IF D92 is ESD sensitive. To minimize risk of damage observe appropriate precautions during handling
and processing.
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+V
Normalized Response
IF-D92
V
Out
R
L
Wavelength (nm)
F
igure
1.
Typical detector response versus wavelength.
F
igure
4A.
Switching time and application circuit
1000
+V
Rc=10k
100
Rc=1k
10
Rc=100
R
L
V
Out
IF-D92
1
0.01
0.1
1
10
100
F
igure
2.
Rise and fall times of phototransistor.
F
igure
4B.
Switching time and application circuit
F
iBer
t
erMinAtion
i
nstructions
1.
Cut off the ends of the optical fiber with a single-
edge razor blade or sharp knife. Try to obtain a
precise 90-degree angle (square).
Insert the fiber through the locking nut and into
the connector until the core tip seats against the
internal micro-lens.
Screw the connector locking nut down to a snug fit,
locking the fiber in place. Do not exceed a torque of
0.4 N.m.
2.
Detector
3.
F
igure
3.
Cross-section of fiber optic device.
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MIN 9.0
MIN .35
M
ARKING:
• XXXXXX - Lot No.
• IFD92 - Part No.
OR
6.86
7.11
.270
.280
• Black housing w/ white dot
• PIN 1. Emitter
• PIN 2. Collector
F
igure
4.
Case outline.
Specifications are believed to be accurate but are subject to change. Industrial Fiber Optics assumes no
responsibility for the consequences of using the information provided beyond replacement warranty for products
not meeting stated specifications. Industrial Fiber Optics products are not authorized for use in life support
applications without written approval from the President of Industrial Fiber Optics Corporation.
CAUTION: • To avoid degraded device life due to package stress, do not bend or form leads outside the orientation shown on drawing.
• Ensure that solder flux does not migrate into the device and block the optical path, degrading the performance.
• f washing the device, liquid may become trapped in the part cavity. Ensure that all potentially corrosive materials are flushed
I
out of the device.
A
pplicAtion
n
otes
DIGITAL TRANSMISSION
The basic circuits of Figure 4 can be used for digital transmission. Figure 4A is non-inverting and Figure 4B is
inverting. The output voltage for Figure 4A is V
OUT
= P
in
x R x R
L
. Where P
in
is the input power from the fiber, R is the
responsivity of the IF-D92 at the wavelength used, and R
L
is the load resistance. The output voltage for Figure 4B is
V
out
= +V – P
in
x R
L
. The speed of both circuits is virtually the same.
ANALOG TRANSMISSION
Sending analog information over an optical fiber is difficult. Any small change in the loop can make the received signal
level change. Transmitting digital information is much more reliable, but performing an analog to digital conversion at
the transmit end and a digital to analog conversion at the receiving end can be cumbersome. Below are simple circuits
for transmitting analog information. They convert the analog voltage to a frequency and then convert the frequency
back to analog.
The circuit shown in Figure 5 is a basic voltage to frequency converter. It uses an LM331 voltage to frequency IC and
an IF-E96E as the emitter. With the supply voltage, +V, set to 15 Volts, the input range is 0 to 10 Volts. The frequency
runs from approximately 200 Hz at 0 Volts input to 9 kHz at 10 Volts input. The duty cycle also changes as the input
voltage changes and variable resistor RS2 should be set so that the duty cycle does not go to 0 % or 100 % at the input
extremes. Resistor R1 sets the drive current for the IF-E96E at approximately 3.3 mA. It can be changed within the
current limits of the IF-E96E and the LM331. The waveform driving the output can be seen at point FOUT.
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F
igure
5.
Voltage to Frequency converter
The circuit shown in Figure 6 is a basic frequency to voltage converter. It uses an LM331 voltage to frequency converter
IC and an IF-D92 to detect the signal from the emitter in the circuit of Figure 5. The supply voltage, +V, should be set
to 15 Volts for a 0 to 10 Volt output range. In this circuit variable resistor RS2 should be adjusted so that the output
voltage tracks the voltage input into the circuit of Figure 5. The inverted received signal can be seen at point FIN.
F
igure
6.
Frequency to Voltage converter
The circuits in Figures 5 and 6 work together to transmit an analog DC voltage over a fiber optic cable. The combined
circuits have a response time of 50 ms (to 1%). Refer to the LM331 datasheet for more complex circuits with higher
accuracy or faster response time.
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