tfdu6301 Vishay, tfdu6301 Datasheet - Page 7

• Manufacturer Part Number: tfdu6301
• Description: Fast Infrared Transceiver Module Fir, 4 Mbit/s For 2.4 V To 3.6 V Operation And Low
• Manufacturer: Vishay

Recommended Circuit Diagram
Operated at a clean low impedance power supply the
TFDU6301 needs no additional external components.
However, depending on the entire system design and
board layout, additional components may be required
(see figure 3).
The capacitor C1 is buffering the supply voltage and
eliminates 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 high operating
voltages and elevated temperatures.
Vishay transceivers integrate a sensitive receiver and
a built-in power driver. The combination of both needs
a careful circuit board layout. The use of thin, long,
Table 1.
Recommended Application Circuit Components
Document Number 84668
Rev. 1.7, 03-Jan-08
Component
C1
C2
R1
R2
19307
V
V
GND
SD
TXD
RXD
CC2
CC1
Figure 3. Recommended Application Circuit
C1
No resistor necessary, the internal controller is able to
R1
R2
C2
Recommended Value
control the current
0.1 µF, Ceramic
10 Ω, 0.125 W
SD
TXD
RXD
IRED Cathode
IRED Anode
V
Ground
4.7 µF, 16 V
CC
resistive and inductive wiring should be avoided. The
inputs (TXD, SD) and the output RXD should be
directly (DC) coupled to the I/O circuit.
The capacitor C2 combined with the resistor R2 is the
low pass filter for smoothing the supply voltage.
R2, C1 and C2 are optional and dependent on the
quality of the supply voltages
noise. An unstable power supply with dropping
voltage
sensitivity
transceiver.
The placement of these parts is critical. It is strongly
recommended to position C2 as close as possible to
the transceiver power supply pins. A Tantalum
capacitor should be used for C1 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 rise time. In that case another
4.7 µF (type, see table under C1) at V
helpful.
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
termination. See e.g. "The Art of Electronics" Paul
Horowitz, Winfield Hill, 1989, Cambridge University
Press, ISBN: 0521370957.
CC2
. Often some power supplies are not able to
during
(and
transmission
CRCW-1206-10R0-F-RT1
transmission
VJ 1206 Y 104 J XXMT
Vishay Part Number
293D 475X9 016B
Vishay Semiconductors
may
V
TFDU6301
CCx
range)
www.vishay.com
and injected
reduce
CC2
of
will be
the
the
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