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TFBS6712 Datasheet(PDF) 7 Page - Vishay Siliconix |
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TFBS6712 Datasheet(HTML) 7 Page - Vishay Siliconix |
7 / 14 page www.vishay.com 276 Document Number 84674 Rev. 1.2, 21-Feb-07 TFBS6712 Vishay Semiconductors Recommended Circuit Diagram Operated at a clean low impedance power supply the TFBS6712 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. 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. R2, C1 and C2 are optional and dependent on the quality of the supply voltages VCCx and injected noise. An unstable power supply with dropping volt- age during transmission 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 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 VCC2. Often some power supplies are not able to follow the fast current rise time. In that case another 4.7 µF (type, see tavle under C1) at VCC2 will be help- ful. 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 termi- nation. See e.g. "The Art of Electronics" Paul Horo- witz, Winfield Hill, 1989, Cambridge University Press, ISBN: 0521370957. Table 1. Recommended Application Circuit Compo- nents 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. Figure 3. Recommended Application Circuit IRED Anode VCC Ground SD TXD RXD V CC2 VCC1 GND SD TXD RXD R1 R2 C1 C2 19430 Component Recommended Value C1 4.7 µF, 16 V Vishay part#: 293D 475X9 016B C2 0.1 µF, Ceramic Vishay part#: VJ1 206 Y 104 J XXMT R1 3.3 V supply voltage: no resistor necessary, the internal controller is able to control the current R2 4.7 Ω, 0.125 W |
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