參數(shù)資料
型號(hào)： TFBS4650
廠商： Vishay Intertechnology,Inc.
英文描述： Standard IrDA with Low Power Consumption; Small Foodprint;
中文描述： 標(biāo)準(zhǔn)IrDAwith低功耗，小Foodprint;
文件頁(yè)數(shù)： 7/13頁(yè)
文件大?。?/td> 235K
代理商： TFBS4650
www.vishay.com
126
Document Number 84672
Rev. 1.1, 03-Jul-06
TFBS4650
Vishay Semiconductors
Recommended Circuit Diagram
Operated at a clean low impedance power supply the
TFBS4650 needs only one additional external com-
ponent when the IRED drive current should be mini-
mized for minimum current consumption according
the low power IrDA standard. When combined opera-
tion in IrDA and Remote Control is intended no cur-
rent limiting resistor is recommended.
However, depending on the entire system design and
board layout, additional components may be required
(see figure 1). When long wires are used for bench
tests, the capacitors are mandatory for testing rise/fall
time correctly.
The capacitor C1 is buffering the supply voltage V
cc2
and eliminates the inductance of the power supply
line. This one should be a small ceramic version or
other fast capacitor to guarantee the fast rise time of
the IRED current. The resistor R1 is necessary for
controlling the IRED drive current when the internally
controlled current is too high for the application.
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,
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.
As already stated above R2, C1 and C2 are optional
and depend on the quality of the supply voltages V
CCx
and injected noise. An unstable power supply with
dropping voltage during transmission may reduce the
sensitivity (and transmission range) of the trans-
ceiver.
The placement of these parts is critical. It is strongly
recommended to position C2 as close as possible to
the transceiver power supply pins.
When connecting the described circuit to the power
supply, low impedance wiring should be used.
In case of extended wiring the inductance of the
power supply can cause dynamically a voltage drop
at V
CC2
. Often some power supplies are not able to
follow the fast current is rise time. In that case another
10 μF cap at V
CC2
will be 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 termina-
tion. See e.g. "The Art of Electronics" Paul Horowitz,
Wienfield Hill, 1989, Cambridge University Press,
ISBN: 0521370957.
Table 2.
Recommended Application Circuit Components
Table 3.
Recommended resistor R1 [
Ω
]
Figure 1. Recommended Application Circuit
IRED Anode
V
CC
Ground
V
CC2
V
CC1
GND
SD
Txd
Rxd
SD
Txd
Rxd
R2
C1
C2
IRED Cathode
19286
R1
Component
C1, C2
Recommended Value
0.1 μF, Ceramic
Vishay part#
VJ 1206 Y 104 J XXMT
See table 3
47
Ω
, 0.125 W (V
CC1
= 3 V)
R1
R2
V
CC2
[V]
2.7
3.0
3.3
Minimized current consumption,
IrDA Low power compliant
24
30
36
相關(guān)PDF資料
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TFBS4650-TR1 Infrared Transceiver 9.6 kbit/s to 115.2 kbit/s (SIR)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TFBS4650_08 制造商:VISHAY 制造商全稱:Vishay Siliconix 功能描述:Infrared Transceiver 9.6 kbit/s to 115.2 kbit/s (SIR)
TFBS4650_09 制造商:VISHAY 制造商全稱:Vishay Siliconix 功能描述:Infrared Transceiver, 9.6 kbit/s to 115.2 kbit/s (SIR)
TFBS4650TR1 制造商:Vishay Angstrohm 功能描述:IRDA TX/RX 0.1152Mbps 2.5V/3.3V 7-Pin T/R 制造商:Vishay 功能描述:IRDA TX/RX 0.1152Mbps 2.5V/3.3V 7-Pin T/R
TFBS4650-TR1 功能描述:紅外收發(fā)器 SIR 115.2 kbits/s 2.4-3.6V Op Voltage RoHS:否 制造商:Vishay Semiconductors 波長(zhǎng):900 nm 連續(xù)數(shù)據(jù)傳輸:115.2 Kbit/s 傳輸距離:1 m 輻射強(qiáng)度:60 mW/sr 半強(qiáng)度角度:44 deg 脈沖寬度:2 us 最大上升時(shí)間:100 ns 最大下降時(shí)間:100 ns LED 電源電壓:- 0.5 V to 6 V 最大正向電流:80 mA 工作電壓:2.4 V to 5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 25 C 尺寸:6 mm x 3.1 mm x 1.9 mm 封裝 / 箱體: 封裝:Reel
TFBS4650-TR1 制造商:Vishay Semiconductors 功能描述:IrDA - Infrared Transceiver
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