HSDL-3005-028 Avago Technologies US Inc., HSDL-3005-028 Datasheet - Page 21

• Manufacturer Part Number: HSDL-3005-028
• Description: Infrared Transceivers 20cm 3V SIR plus R C Top View
• Manufacturer: Avago Technologies US Inc.

Specifications of HSDL-3005-028

• Wavelength: 885 nm, 875 nm
• Continual Data Transmission: 115.2 Kbit/s
• Transmission Distance: 50 cm
• Radiant Intensity: 20 mW/sr
• Half Intensity Angle Degrees: 30 deg
• Pulse Width: 2.3 us, 1.6 us
• Maximum Rise Time: 100 ns, 600 ns
• Maximum Fall Time: 100 ns, 600 ns
• Led Supply Voltage: 2.4 V to 4.5 V
• Operating Voltage: 2.4 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 25 C
• Dimensions: 7.5 mm x 3.35 mm x 2.8 mm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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
Flat Window
(First choice)
21
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 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.
Curved Front and Back
(Second choice)
Curved Front, Flat Back
(Do not use)