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## HSDL3208 Datasheet(PDF) 15 Page - Agilent(Hewlett-Packard)

 Part # HSDL3208 Description Ultra Small Profile Package IrDA Data Compliant Low Power 115.2 kbit/s Infrared Transceiver Download 18 Pages Scroll/Zoom 100% Manufacturer HP [Agilent(Hewlett-Packard)] Direct Link http://www.home.agilent.com Logo

## HSDL3208 Datasheet(HTML) 15 Page - Agilent(Hewlett-Packard)

 15 / 18 page15Optical port dimensions forHSDL-3208:To ensure IrDA compliance, someconstraints on the height and widthof the window exist. The minimumdimensions ensure that the IrDAcone angles are met withoutvignetting. The maximumdimensions minimize the effects ofstray light. The minimum sizecorresponds to a cone angle of 30°and the maximum size correspondsto a cone angle of 60°.In the figure below, X is the widthof the window, Y is the height ofthe window and Z is the distanceAppendix D: Window Designs for HSDL-3208from the HSDL-3208 to the back ofthe window. The distance from thecenter of the LED lens to thecenter of the photodiode lens, K, is5.1 mm. The equations forcomputing the window dimensionsare as follows:X = K + 2*(Z + D)*tanAY = 2*(Z + D)*tanAThe above equations assume thatthe thickness of the window isnegligible compared to thedistance of the module from theback of the window (Z). If they arecomparable, Z' replaces Z in theabove equation. Z' is defined asZ' = Z + t/nwhere ‘t’ is the thickness of thewindow and ‘n’ is the refractiveindex of the window material.The depth of the LED image insidethe HSDL-3208, D, is 3.17 mm.‘A’ is the required half angle forviewing. For IrDA compliance, theminimum is 150 and the maximumis 300. Assuming the thickness ofthe window to be negligible, theequations result in the followingtables and graphs:DZKAIR TRANSPARENTWINDOWOPAQUEMATERIALOPAQUEMATERIALIR TRANSPARENT WINDOWXYFigure 21. Window design diagram.

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## Similar Description - HSDL3208

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