HSDL-3612-038 Lite-On Electronics, HSDL-3612-038 Datasheet - Page 24

• Manufacturer Part Number: HSDL-3612-038
• Description: Infrared Transceivers IR Transceiver
• Manufacturer: Lite-On Electronics
• Type: TX/RXr

Specifications of HSDL-3612-038

• Wavelength: 875 nm, 880 nm
• Continual Data Transmission: 115.2 Kbit/s
• Transmission Distance: 1.5 m
• Radiant Intensity: 120 mW/sr
• Half Intensity Angle Degrees: 30 deg to 60 deg
• Pulse Width: 4 us, 1.6 us
• Maximum Rise Time: 40 ns, 25 ns
• Maximum Fall Time: 40 ns, 25 ns
• Led Supply Voltage: - 0.5 V to 7 V
• Maximum Forward Current: 165 mA
• Operating Voltage: 2.7 V to 5.25 V
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: - 20 C
• Dimensions: 12.2 mm x 5.1 mm x 4 mm
• Data Rate: 115.2Kbps
• Peak Wavelength: 875/880nm
• Angle Of Half Sensitivity: 60/30°
• Communication Distance: 150
• Package Type: Ultra Small Profile
• Fall Time: 40/25ns
• Rise Time: 40/25ns
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (min): 2.7V
• Operating Supply Voltage (max): 5.25V
• Mounting: Surface Mount
• Pin Count: 11
• Operating Temp Range: -20C to 70C
• Operating Temperature Classification: Commercial
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

24
Window Material
Almost any plastic material will work as a window mate-
rial. 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 percent or less for best optical
performance. Light loss should be measured at 875 nm.
Flat Window
(First choice)
Curved Front and Back
(Second choice)
Shape of the Window
From an optics standpoint, the window should be flat.
This ensures that the window will not alter either the ra-
diation pattern of the LED, or the receive pattern of the
photodiode.
If the window must be curved for mechanical or indus-
trial 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 radia-
tion 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, Flat Back
(Do not use)