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TFDT4500 Datasheet(PDF) 5 Page - Vishay Siliconix |
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TFDT4500 Datasheet(HTML) 5 Page - Vishay Siliconix |
5 / 12 page TFDU4100/TFDS4500/TFDT4500 TELEFUNKEN Semiconductor Pending—Rev. A, 03-Apr-98 5 Pre-Release Information Optoelectronic Characteristics (Cont’d) Parameter Symbol Test Conditionsa Minb Typc Maxb Unit Transmitter IRED Operating Currentd ID Current limiting resistor is series to IRED: R1 = 8.2 Ω, VCC2 = 5V 0.3 0.4 A Logic Low Transmitter Input Voltage VIL (Txd) 0 0.8 V Logic High Transmitter Input Voltage VIH (Txd) 2.4 VCC1+0.5 V Output Radiant Intensitye IeH Current limiting resistor in series to IRED: R1 = 8.2Ω @ VCC2 = 5V, α = ±15_ 45 140 200 mW/sr Output Radiant Intensity IeL Logic Low Level 0.04 mW/sr Angle of Half Intensity α ±24 _ Peak Wavelength of Emission λP 880 900 nm Halfwidth of Emission Spectrum 60 nm Optical Rise Time, Fall Time tR, tF 115.2 kHz square wave signal, duty cycle 1:1 200 600 ns Optical Overshoot 25 % Rising Edge Peak–to–Peak Jitter tj Over a period of 10 bits, independent of information content 0.2 µs Notes a. Tamb = 25_C, VCC = 2.7 – 5.5 V unless otherwise noted. b. The algebraic convention whereby the most negative value is a minimum and the most positive a maximum. c. Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing. d. IRED Operating Current can be adjusted by variation of R1 e. In agreement with IEC 825 eye safety limit Recommended Circuit Diagram The only required components for designing an IrDA 1.2 compatible design using TEMIC SIR transceivers are a current limiting resistor to the IRED. However, depending on the entire system design and board layout, additional components may be required (see Figure 1). It is recommended that the capacitors C1 and C2 are positioned as near as possible to the transceiver power supply pins, as in the proposed layout in Figure 1. A tantalum capacitor should be used for C1, while a ceramic capacitor should be used for C2 to suppress RF noise. Also, when connecting the described circuit to the power supply, low impedance wiring should be used. R1 is used for controlling the current through the IR emitter. For increasing the output power of the IRED, the value of the resistor should be reduced. Similarly, to reduce the output power of the IRED, the value of the resistor should be increased. For typical values of R1 see Fig 2. For IrDA compliant operation, a current control resistor of 8–12 Ω is recommended. The upper drive current limitation is dependent on the duty cycle and is given by the absolute maximum ratings on the data sheet and the eye safety limitations given by IEC825–1. IRED Cathode Rxd VCC1/SD GND IRED Anode Txd SC NC TFDx4x00 R1 C1 C2 R2 VCC2 VCC1/SD Rxd Txd GND SC Note: Outlined components are optional depending on quality of power supply. Figure 1. Recommended Application Circuit R2, C1 and C2 are optional and dependent on the quality of the supply voltage VCC1 and injected noise. An |
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