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OPB780-Kit
Color Sensor Evaluation Kit
The OPB780Z consist of:
1. White LED for illumination of the target
2. Photodiode Array consisting of:
16 Green Filter Diodes
16 Clear Filter Diodes
16 Red Filter Diodes
16 Blue Filter Diodes
3. Current to Frequency Converter
4. TTL and CMOS Drive Circuitry
The OPB780Z photodiodes as provided are designed
to recognize ultraviolet, visible as well as near infrared
wavelengths (from 300 to 1,050 nanometers) The
graphs below show the typical Spectral Response for
each photodiode configuration. When a near infrared
rejecting filter similar to the Hoya CM500 is placed in
front of the sensor, the higher wavelengths (above 700
nm) are eliminated thus enhancing recognition of
colors in the visible range.
5. Plastic Package with 10: (25.4cm) FFC
Typical Spectral Response
All 16 photodiodes that have the same color filter are
Full Wavelength Sensitivity
connected in parallel. Package pin numbers 4 (S2)
and 6 (S3) can be used to select the desired
photodiode/filter configuration to optimize color
identification. All 64 photodiodes are 120μm x 120μm
in size and are on 144μm centers.
The output frequency provided by the OPB780Z may
vary from part to part and should be calibrated as
required to meet each application. The more colors
that are to be identified require more accurate
calibration and longer sampling rate. A small amount
of jitter will be present in the frequency provided for a
color and must be taken into consideration depending
on the accuracy required.
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
No rmalized to
Clear @ 680 nm
TA = 25° C
300
500
700
900
1100
λ p Wavelength (nm)
Spectral Response
1.0
0.9
0.8
0.7
No rmalized to
Clear @ 530 nm
TA = 25° C
Frequency-A
Frequency-B
0.6
The internal scaling is preconfigured for the highest
frequency output of typically 600kHz. The 600kHz
frequency shortens the sampling time providing a
small amount of jitter in the output frequency.
0.5
0.4
0.3
0.2
The user must take into consideration the luminance
intensity (amount of light) that may be acknowledged
by the human eye. As the luminance intensity
decreases, the amount of color recognized is
0.1
0.0
300
500 700 900
λ p Wavelength (nm)
1100
diminished. In order to consistently reproduce a
specific color with the same output frequency, the
luminance intensity must be the consistent. When
critical identification of specific colors is required, the
The standard product allows the OPB780Z to be used
to recognize colors over the full wavelength of 300nm
to 1100nm beyond those of the human visual range.
angle of view and distance may critical characteristics.
OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.
Issue A.2 11/09
Page 2 of 9
OPTEK Technology Inc. — 1645 Wallace Drive, Carrollton, Texas 75006
Phone: (972) 323-2200 or (800) 341-4747 FAX: (972) 323-2396 sensors@optekinc.com www.optekinc.com
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