Finding The Right Color Has Never Been Easier

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The OPTEK OPB780Z color sensor precisely and consistently measures 256+ colors. The full color sensor uses a programmable light-to-frequency converter that combines 64 configurable silicon photodiodes (on a 144µm center array and measuring 120µm x 120µm each) and a current-to-frequency converter on a single monolithic CMOS integrated circuit, packaged in a small, lightweight package that makes it ideal for using in miniature applications.

The output is a square wave (50% duty cycle) with a frequency directly proportional to light chromaticity and irradiance.

The light-to-frequency converter reads an 8 x 8 array of photodiodes that consists of four groups of 16 photodiodes each, segregated by color: 16 photodiodes with red filters, 16 photodiodes with green filters, 16 photodiodes with blue filters and 16 photodiodes with clear filters. Each color’s group of 16 photodiodes is interdigitated to minimize the effect of non-uniformity of incident irradiance. Each color’s group is also connected in parallel. The type of photodiode used during operation is pin-selectable.

The internal photodiode array is controlled by two logic inputs. The output of the device is designed to drive a standard TTL or CMOS logic input over short distances. The flat flexible interface cable is designed to interface with an AVX ELCO connector.

The OPB780Z consist of

• White LED for illumination of the target
• Photodiode array consisting of:
• 16 green filter diodes
• 16 clear filter diodes
• 16 red filter diodes
• 16 blue filter diodes
• Current-to-frequency converter
• TTL and CMOS drive circuitry
• Plastic package

The OPB780Z photodiodes in the normal unfiltered configuration are designed to recognize ultraviolet, visible as well as near infrared wavelengths (from 300 to 1,050nm). When a near infrared rejecting filter similar to the Hoya CM500 is placed in front of the sensor, the higher wavelengths (above 700nm) are eliminated, thus enhancing recognition of colors in the visible range.

 

FEATURES Integrated visible white LED with separate input pin Dual tabs allow mounting from the front or rear of the device High resolution conversion of light/color intensity to frequency Selectable color output frequency Communicates directly with a microcontroller Sensor power supply operation (2.7V to 5.5V) Includes LED, sensor and interface cable

APPLICATIONS Photographic equipment Colormetry Chemical analyzers Display contrast controls High resolution digital measurement of light intensity   OPB780 Color Sensor

 

 

 

 Featured Products

Part Number		Description	Data Sheet	App. Notes
OPB780Z		Reflective Color Sensor Assembly with 10” Long Flat Flex Cable

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