TFDU4300-TT3 Vishay, TFDU4300-TT3 Datasheet - Page 6

• Manufacturer Part Number: TFDU4300-TT3
• Description: Infrared Transceivers SIR 115.2 kbits/s 2.4-5.5V Op Voltage
• Manufacturer: Vishay
• Type: TX/RXr
• Series: -r

Specifications of TFDU4300-TT3

• Wavelength: 900 nm
• Continual Data Transmission: 115.2 Kbit/s
• Transmission Distance: 0.7 m
• Radiant Intensity: 65 mW/sr
• Half Intensity Angle Degrees: 48 deg
• Pulse Width: 2 us
• Maximum Rise Time: 100 ns
• Maximum Fall Time: 100 ns
• Operating Voltage: 2.4 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 30 C
• Dimensions: 8.5 mm x 2.9 mm x 2.5 mm
• Data Rate: 115.2Kbps
• Peak Wavelength: 900nm
• Angle Of Half Sensitivity: 48°
• Package Type: SMD
• Fall Time: 100ns
• Rise Time: 100ns
• Operating Supply Voltage (typ): 2.5/3.3/5V
• Operating Supply Voltage (min): 2.4V
• Operating Supply Voltage (max): 5.5V
• Mounting: Surface Mount
• Pin Count: 8
• Operating Temp Range: -30C to 85C
• Operating Temperature Classification: Commercial
• Idle Current, Typ @ 25° C: 75µA
• Link Range, Low Power: 70cm
• Operating Temperature: -30°C ~ 85°C
• Orientation: Top View
• Shutdown: Yes
• Size: 8.5mm x 2.9mm x 2.5mm
• Standards: IrPHY 1.0
• Supply Voltage: 2.4 V ~ 5.5 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Recommended Circuit Diagram
Operated with a clean low impedance power supply
the
components. However, depending on the entire
system
components may be required (see figure 1).
*) R1 is optional when reduced intensity is used
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 the current limiting resistor, which
may be used to reduce the operating current to levels
below the specified controlled values for saving
battery power.
Vishay’s 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, resistive and inductive wiring should be avoided.
The shutdown input must be grounded for normal
operation, also when the shutdown function is not
used.
Document Number 82614
Rev. 1.8, 19-Feb-09
19295
V
V
GND
V
SD
TXD
RXD
TFDU4300
IRED
CC
logic
Figure 1. Recommended Application Circuit
design
C1
needs
and
R1*)
R2
[e-mail], [e-mail], [e-mail]
board
For technical questions within your region, please contact one of the following:
C2
no
additional
layout,
V
V
Ground
V
SD
TXD
RXD
IRED C
CC2
CC1
logic
, IRED A
additional
external
Table 1.
Recommended
Components
The inputs (TXD, SD) and the output RXD should be
directly connected (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 VCC1 and injected
noise. An unstable power supply with dropping
voltage during transmision may reduce the sensitivity
(and transmission range) of the transceiver.
The placement of these parts is critical. It is strongly
recommended to position C2 as close as possible to
the transceiver pins.
When extended wiring is used as in bench tests the
inductance
dynamically a voltage drop at VCC2. Often some
power supplies are not able to follow the fast current
rise time. In that case another 4.7 µF (type, see table
under C1) at VCC2 will be helpful.
Under extreme EMI conditions as placing an
RF-transmitter antenna on top of the transceiver, we
recommend to protect all inputs by a low-pass filter,
as a minimum a 12 pF capacitor, especially at the
RXD port. The transceiver itself withstands EMI at a
GSM frequencies above 500 V/m. When interference
is observed, the wiring to the inputs picks it up. It is
verified by DPI measurements that as long as the
interfering RF - voltage is below the logic threshold
levels of the inputs and equivalent levels at the
outputs no interferences are expected.
One should keep in mind that basic RF - design rules
for circuits 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.
Component
C1
C2
R1
R2
depends on current to
Recommended value
of
0.1 µF, Ceramic
47 Ω, 0.125 W
4.7 µF, 16 V
be adjusted
the
Vishay Semiconductors
power
Application
CRCW-1206-47R0-F-RT1
supply
VJ 1206 Y 104 J XXMT
Vishay part number
293D 475X9 016B
TFDU4300
www.vishay.com
can
Circuit
cause
209