Ambient Light

The HSDL-1100 receiver design
allows for the ambient light levels
of sunlight, flourescent light, and
incandescent light specified in the
IrDA Physical Layer Specification.
As with the HSDL-1000, several
technologies are used in the HSDL-
1100 design to reduce the effects of
interfering ambient light. The
package mold compound is tinted
with dye to filter out light wavelengths
below the Ir wavelengths of
850-900 nm. The lens of the detector
is designed to focus light within
the IrDA viewing angle. The pre-
Worst Case Immunity HSDL-1000 HSDL-1100
Rxd Rxd-A Rxd-B
Power Supply Noise Immunity with no external 20 mV 90 mV 70 mV
VCC filter or decoupling
Power Supply Noise Immunity with > 1 volt pk-pk > 1 volt pk-pk
recommended VCC filter including Cx5, R3, Cx6