TFBS4710-TT3 Vishay, TFBS4710-TT3 Datasheet - Page 6

• Manufacturer Part Number: TFBS4710-TT3
• Description: Infrared Transceivers SIR 115.2 kbits/s 2.7-5.5V Op Voltage
• Manufacturer: Vishay
• Type: TX/RXr

Specifications of TFBS4710-TT3

• Data Rate: 115.2Kbps
• Peak Wavelength: 900nm
• Angle Of Half Sensitivity: 48°
• Pulse Width: 2us
• Radiant Intensity: 0.07W/sr
• Communication Distance: 100
• Led Supply Voltage: -0.5 to 6V
• Package Type: Ultra Small Profile
• Fall Time: 100ns
• Rise Time: 100ns
• Dimensions: 8.96x3.33x2.74
• 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: 6
• Operating Temp Range: -25C to 85C
• Operating Temperature Classification: Commercial
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Recommended Circuit Diagram
The TFBS4710 integrates a sensitive receiver and a
built-in power driver. This combination needs a care-
ful circuit layout. The use of thin, long, 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 combination of resistor R1 and capacitors C1,
C2, C3 and C4 filter out any power supply noise to
provide a smooth supply voltage.
The placement of these components is critical. It is
strongly recommended to position C3 and C4 as
close as possible to the transceiver power supply
pins. A Tantalum capacitor should be used for C1 and
C3 while a ceramic capacitor should be used for C2
and C4.
A current limiting resistor is not needed for normal
operation. It is strongly recommended to use the Rled
values mentioned in Table 1 below for high tempera-
ture operation. For Low Power Mode, IRED Anode
voltage of less than 5 V is recommended.
Under extreme EMI conditions as placing a RF -
transmitter antenna on top of the transceiver, it is rec-
ommended to protect all inputs by a low-pass filter, as
a minimum a 12 pF capacitor, especially at the RXD
port.
Basic RF design rules for circuit design should be fol-
lowed. Especially longer signal lines should not be
used without proper termination. For reference see
"The Art of Electronics" by Paul Horowitz, Winfield
Hill, 1989, Cambridge University Press, ISBN:
0521370957.
Document Number 82612
Rev. 1.5, 03-Jul-06
V CC
IR Controller
18281
Figure 3. Recommended Application Circuit
IRMODE
IRRX
Vdd
IRTX
GND
4.7 µF
C1
0.1µF
C2
R1= 47Ω
Rled
4.7 µF
C3
0.1 µF
C4
IREDA (1)
TXD
RXD
SD
Vcc
GND
TFBS4710
(2)
(3)
(4)
(5)
(6)
Table 1.
High Operating Temperature > 70 °C
I/O and Software
In the description, already different I/Os are men-
tioned. Different combinations are tested and the
function verified with the special drivers available
from the I/O suppliers. In special cases refer to the I/
O manual, the Vishay application notes, or contact
directly Vishay Sales, Marketing or Application.
Table 2.
Recommended Application Circuit Com-
ponents
Component
C1, C3
C2, C4
V
Rled
(V)
2.7
3.3
5.0
LED
R1
Standard Power Mode
(Intensity > 40 mW/sr,
Recommended Value
0.1 µF, Ceramic
47 Ω, 0.125 W
4.7 µF, 16 V
See Table 1
Rled (Ω)
0° - 15°)
18
3
6
Vishay Semiconductors
CRCW-1206-47R0-F-RT1
VJ 1206 Y 104 J XXMT
(Intensity > 3.6 mW/sr,
Vishay Part Number
293D 475X9 016B
TFBS4710
Low Power Mode
Rled (Ω)
0° - 15°)
www.vishay.com
> 50
> 60
50
147