When, in an electronic circuit. light is
converted into electrical sjgnals, use
is normally made of photo diodes, photo
transistors or light -dependent resistors
(LDRs). These components translate the
irradiance into analogue electrical quantities.
When these converters are used for
measurements on optical signals, the limits
of current technology are reached in many
cases. Now, new opto-eleclronic components
with digital output, such as the
Type TSL220 from Texas Instruments
offer many new possibilities in this field.
This device is an integrated light-to-frequency
converter, the frequency of whose
digital output depends on the quantity
of light falling on to it. The IC, which is
housed in a transparent DIL8 enclosure,
operates from 5 V and draws a current
of only 7-8 mA.
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