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參數資料
| 型號： | HSDL-3220-021 |
| 廠商： | Avago Technologies Ltd. |
| 英文描述： | IrDA㈢ Data Compliant Low Power 4.0 Mbit/s Infrared Transceiver |
| 中文描述： | 紅外線㈢數據兼容低功耗4.0 Mbit / s的紅外收發器 |
| 文件頁數： | 18/19頁 |
| 文件大?。?/td> | 190K |
| 代理商： | HSDL-3220-021 |
18
Window Material
Almost any plastic material will
work as a window material.
Polycarbonate is recommended.
The surface finish of the plastic
should be smooth, without any
texture. An IR filter dye may be
used in the window to make it
look black to the eye, but the
total optical loss of the window
should be 10% or less for best
optical performance. Light loss
should be measured at 875 nm.
The recommended plastic
materials for use as a cosmetic
window are available from
General Electric Plastics.
Shape of the Window
From an optics standpoint, the
window should be flat. This
ensures that the window will not
alter either the radiation pattern
of the LED, or the receive pattern
of the photodiode.
If the window must be curved for
mechanical or industrial design
reasons, place the same curve on
the back side of the window that
has an identical radius as the
front side. While this will not
completely eliminate the lens
effect of the front curved surface,
it will significantly reduce the
effects. The amount of change in
the radiation pattern is depen-
dent upon the material chosen
for the window, the radius of the
front and back curves, and the
distance from the back surface to
the transceiver. Once these items
are known, a lens design can be
made which will eliminate the
effect of the front surface curve.
The following drawings show the
effects of a curved window on the
radiation pattern. In all cases,
the center thickness of the
window is 1.5 mm, the window is
made of polycarbonate plastic,
and the distance from the
transceiver to the back surface of
the window is 3 mm.
Recommended Plastic Materials:
Material #
Light Transmission
Haze
Refractive Index
Lexan 141
88%
1%
1.586
Lexan 920A
85%
1%
1.586
Lexan 940A
85%
1%
1.586
Note
: 920A and 940A are more flame retardant than 141.
Figure 22. Shape of windows.
Curved Front and Back
(Second Choice)
Flat Window
(First Choice)
Curved Front, Flat Back
(Do Not Use)
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| HSDL-3600#007 | 制造商:Hewlett Packard Co 功能描述:SPECIALTY INTERFACE CIRCUIT, SMA10 |
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