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TFBS4652-TR3 Datasheet(PDF) 7 Page - Vishay Siliconix |
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TFBS4652-TR3 Datasheet(HTML) 7 Page - Vishay Siliconix |
7 / 13 page TFBS4652 Document Number 84671 Rev. 1.1, 03-Jul-06 Vishay Semiconductors www.vishay.com 137 Recommended Circuit Diagram Operated at a clean low impedance power supply the TFBS4652 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. 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 VCC2 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 VCCx 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 VCC2. Often some power supplies are not apply to follow the fast current is rise time. In that case another 10 µF cap at VCC2 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 R1 R2 C1 C2 V logic V logic 19289 Component Recommended Value C1, C2 0.1 µF, Ceramic, Vishay part# VJ 1206 Y 104 J XXMT R1 See table 3 R2 47 Ω, 0.125 W (V CC1 = 3 V) VCC2 [V] Minimized current consumption, IrDA Low power compliant 2.7 24 3.0 30 3.3 36 |
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Similar Description - TFBS4652-TR3 |
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