ASDL-3212-021 Avago Technologies US Inc., ASDL-3212-021 Datasheet - Page 16

• Manufacturer Part Number: ASDL-3212-021
• Description: Infrared Transceivers SFF MIR Front w/o Shield
• Manufacturer: Avago Technologies US Inc.

Specifications of ASDL-3212-021

• Wavelength: 870 nm, 875 nm
• Continual Data Transmission: 1.152 Mbit/s
• Transmission Distance: 50 cm
• Radiant Intensity: 80 mW/sr
• Half Intensity Angle Degrees: 15 deg
• Pulse Width: 1.5 us, 1.6 us
• Maximum Rise Time: 60 ns, 600 ns
• Maximum Fall Time: 60 ns, 600 ns
• Led Supply Voltage: 0 V to 6 V
• Maximum Forward Current: 60 mA
• Operating Voltage: 2.4 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 25 C
• Dimensions: 7 mm x 2.73 mm x 1.64 mm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Module Depth
Figure D2. Aperture Height (x) vs. Module Depth (z)
16
Figure D3. Aperture Height (y) vs. Module Depth (z)
(z) mm
0
1
2
3
4
5
6
7
8
9
18
16
14
12
10
25
20
15
10
8
6
4
2
0
5
0
0
0
Ymax
Ymin
1
1
Xmax
Xmin
Aperture Width (x, mm)
Max
10.09
11.24
12.40
13.55
14.71
15.86
17.02
18.17
19.33
20.48
2
2
3
3
min
7.42
7.95
8.49
9.02
9.56
10.09
10.63
11.17
11.70
12.24
Module Depth (z) mm
Module Depth (z) mm
4
4
5
5
Aperture height (y, mm)
Max
4.99
6.14
7.30
8.45
9.61
10.76
11.92
13.07
14.23
15.38
6
6
7
7
Min
2.32
2.85
3.39
3.92
4.46
4.99
5.53
6.07
6.60
7.14
8
8
9
9
The recommended minimum aperture width and height
is based on the assumption that the center of the window
and the center of the module are the same. It is recom-
mended that the tolerance for assembly be considered
as well. The minimum window size which will take into
account of the assembly tolerance is de ned as:
X (min + assembly tolerance) = Xmin + 2*(assembly
tolerance) (Dimensions are in mm)
Y (min + assembly tolerance) = Ymin + 2*(assembly
tolerance) (Dimensions are in mm)
Window Material
Almost any plastic material will work as a window
material. Polycarbonate is recommended. The surface
texture. An IR lter 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 885 nm.
The recommended plastic materials for use as a cosmetic
window are available from General Electric Plastics.
Recommended Plastic Materials:
Note: 920A and 940A are more ame retardant than 141.
Recommended Dye: Violet #21051 (IR transmissant above
625mm)
Shape of the Window
From an optics standpoint, the window should be at.
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 mechani-
cal or industrial design reasons, place the same curve on
the backside of the window that has an identical radius as
the front side. While this will not completely eliminate the
lens e ect of the front curved surface, it will signi cantly
reduce the e ects. The amount of change in the radiation
pattern is dependent 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 e ect of the front surface curve. The
following drawings show the e ects 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 polycar-
bonate plastic, and the distance from the transceiver to
the back surface of the window is 3 mm.
Material #
Lexan 141
Lexan 920A
Lexan 940A
nish of the plastic should be smooth, without any
88%
85%
85%
Haze
1%
1%
1%
Refractive Index
1.586
1.586
1.586