ADJD-E622-QR999 is a high performance, small in size, cost effective light to voltage converting sensor. The sensor combines a photodiode array and three transimpedance amplifiers in a single monolithic CMOS IC solution. With a Red (R), Green (G) and Blue (B) color filters coated over the photodiode array, the sensor converts RGB light to analog voltage outputs, denoted by VROUT, VGOUT and VBOUT, respectively. Complete project with ATmega8 using this sensor can be read at THIS ARTICLE
In comparison to some other color sensors this solution has embedded transimpedance amplifiers that drastically decrease your design. QFN-16 package is hard to solder and you have to be very careful to avoid heat damage of sensor that actually happens in our case. Special solder paste is recommended and reflow soldering profile is avaiable.
Application . This monolithic CMOS IC solution is ideal choice as light sensor in automotive application. Other potential applications are such as environmental lighting, cabin lighting, decorative lighting, general color detection, industrial process, etc.
Theory of Operation . The integral R,G,B color filters on the photodiode array detect the R,G,B components of the light falling on the sensor. The photodiode converts the R,G,B light components into photocurrents. The integrated transimpedence amplifiers for R,G,B components then converts the photocurrent to analog voltage outputs. The voltage output of each R,G,B channel increases linearly with increasing light intensity. Sensor IC block diagram is shown on picture.
Power requirements: 4.5 VDC to 5.5 VDC (5 VDC typ) @2.4mA, A decoupling capacitor of 100nF between VDD and GND is recommended.
Output: 3 analog voltage outputs
Operating temperature: 0°C to 70°C (Typical 25°C)
Dimensions: 5x5x0.75 [mm]
Price: About $8
Recommended circuit (only red channel is shown):
Every channel has three bits for setting gain of transimpedance amplifier. Following table shows dependence of gain resistance from bit selection.
Spectral responsivity on next pictures shows that sensor has the best response at red wavelenghts (even a little bit IR light). Thus, it can happen that sensor detects red color at day light. Adjusting gain can fix this problem.
Complete datasheet is available at following link: ADJD-E622-QR999 RGB Color Sensor