TFBS4710-TR1 Vishay, TFBS4710-TR1 Datasheet - Page 6

• Manufacturer Part Number: TFBS4710-TR1
• Description: Infrared Transceivers SIR 115.2 kbits/s 2.7-5.5V Op Voltage
• Manufacturer: Vishay

Specifications of TFBS4710-TR1

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

TFBS4710
Vishay Semiconductors
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.
www.vishay.com
6
VCC
IR Controller
18281
Figure 3. Recommended Application Circuit
IRMODE
Vdd
IRRX
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)
(6)
(5)
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
CRCW-1206-47R0-F-RT1
Document Number 82612
VJ 1206 Y 104 J XXMT
(Intensity > 3.6 mW/sr,
Vishay Part Number
293D 475X9 016B
Low Power Mode
Rev. 1.5, 23-Feb-06
Rled (Ω)
0° - 15°)
> 50
> 60
50