TFDU6102 Vishay, TFDU6102 Datasheet - Page 7

• Manufacturer Part Number: TFDU6102
• Manufacturer: Vishay
• Type: TX/RXr

Specifications of TFDU6102

• Data Rate: 0.004kbps
• Peak Wavelength: 900nm
• Angle Of Half Sensitivity: 48°
• Pulse Width: 2.1us
• Communication Distance: 100
• Led Supply Voltage: -0.5 to 6.5V
• Fall Time: 40ns
• Rise Time: 40ns
• Dimensions: 9.7x4.7x4
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (min): 2.7V
• Operating Supply Voltage (max): 5.5V
• Mounting: Surface Mount
• Pin Count: 8
• Operating Temp Range: -25C to 85C
• Operating Temperature Classification: Commercial
• Lead Free Status / Rohs Status: Compliant

TFDU6102
Vishay Semiconductors
Recommended Circuit Diagram
Vishay Semiconductors transceivers integrate a sen-
sitive receiver and a built-in power driver. The combi-
nation of both needs a careful circuit board layout.
The use of thin, long, resistive and inductive wiring
should be avoided. The inputs (TXD, SD, Mode) and
the output RXD should be directly (DC) coupled to the
I/O circuit.
The capacitor C1 is buffering the supply voltage and
reduces the influence of the inductance of the power
supply line. This one should be a Tantalum or other
fast capacitor to guarantee the fast rise time of the
IRED current. The resistor R1 is only necessary for
Table 1.
Recommended Application Circuit Components
www.vishay.com
288
Component
18469
C1, C3
V
V
GND
Mode
SD
TXD
RXD
CC2
CC1
C2
R1
R2
Figure 1. Recommended Application Circuit
C1
3.3 V supply voltage: no resistors necessary, the internal
5 V supply voltage: 2 Ω , 0.25 W ( recommended using
R2
C3
R1
controller is able to control the current
two 1 Ω, 0.125 W resistor in series)
C2
Recommended Value
0.1 µF, Ceramic
10 Ω, 0.125 W
IRED Anode
V
Ground
Mode
SD
TXD
RXD
IRED Cathode
4.7 µF, 16 V
CC
higher operating voltages and elevated temperatures,
see derating curve in figure 5, to avoid too high inter-
nal power dissipation.
The capacitors C2 and C3 combined with the resistor
R2 (as the low pass filter) is smoothing the supply
voltage V
dependent on the quality of the supply voltages V
and V
ply with dropping voltage during transmission may
reduce sensitivity (and transmission range) of the
transceiver. The placement of these parts is critical. It
is strongly recommended to position C2 and C3 as
close as possible to the transceiver power supply
pins. A Tantalum capacitor should be used for C1 and
C3 while a ceramic capacitor is used for C2.
In addition, when connecting the described circuit to
the power supply, low impedance wiring should be
used.
When extended wiring is used the inductance of the
power supply can cause dynamically a voltage drop
at V
follow the fast current is rise time. In that case another
4.7 µF (type, see table under C1) at V
ful.
Keep in mind that basic RF-design rules for circuit
design should be taken into account. Especially
longer signal lines should not be used without termi-
nation. See e.g. "The Art of Electronics" Paul Horow-
itz, Wienfield Hill, 1989, Cambridge University Press,
ISBN: 0 521 37095 7.
CC2
CC2
. Often some power supplies are not apply to
CC1
and injected noise. An unstable power sup-
. R2, C1, C2, and C3 are optional and
e.g. 2 x CRCW-1206-1R0-F-RT1
CRCW-1206-10R0-F-RT1
VJ 1206 Y 104 J XXMT
Vishay Part Number
293D 475X9 016B
Document Number 82550
Rev. 1.7, 21-Aug-06
CC2
will be help-
CC1