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| 型號： | ASDL-3212-021 |
| 廠商： | LITE-ON ELECTRONICS INC |
| 元件分類： | 其它接口 |
| 中文描述： | SPECIALTY INTERFACE CIRCUIT, DMA6 |
| 封裝： | 7 X 2.73 MM, 1.64 MM HEIGHT, MINIATURE PACKAGE-6 |
| 文件頁數(shù)： | 7/17頁 |
| 文件大?。?/td> | 542K |
| 代理商： | ASDL-3212-021 |
5
Appendix D: Window Design for ASDL-3212
Window Dimension
To ensure IrDA compliance, some constraints on the
height and width of the window exist. The minimum
dimensions ensure that the IrDA cones angles are met
withoutvignetting.Themaximumdimensionsminimize
theeffectsofstraylight.Theminimumsizecorresponds
to a cone angle of 300 and the maximum size corre-
spondstoaconeangleof600.
InfigureD1,Xisthewidthofthewindow,Yistheheight
ofthewindowandZisthedistancefromtheASDL-3212
tothebackofthewindow.Thedistancefromthecenter
oftheLEDlenstothecenterofthephotodiodelens,K,
is5.1mm.Theequationsforcomputingthewindowdi-
mensionsareasfollows:
X=K+2*(Z+D)*tanA
Y=2*(Z+D)*tanA
K
Z
X
Y
D
IR Transparent Window
OPAQUE MATERIAL
IR Transparent Window
OPAQUE MATERIAL
A
Figure D1. Window Design for ASDL-3212
The above equations assume that the thickness of the
window is negligible compared to the distance of the
modulefromthebackofthewindow(Z).Iftheyarecom-
parable,Z’replacesZintheaboveequation.Z’isdefined
as
Z’=Z+t/n
where‘t’isthethicknessofthewindowand‘n’isthere-
fractiveindexofthewindowmaterial.
ThedepthoftheLEDimageinsidetheASDL-3212,D,is
4.32mm.‘A’istherequiredhalfangleforviewing.ForIrDA
compliance, the minimum is 150 and the maximum is
300. Assuming the thickness of the window to be neg-
ligible, the equations result in the following table and
figures:
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