The TCS3104 RGB Light−to−Voltage Converter combines three photodiodes with optical filters, amplifiers, and gain-switching circuitry on a single chip. The output of each channel is a voltage that is linearly proportional to light intensity (irradiance) on the corresponding photodiode element. Gain is switchable via a digital input pin from 1× to 4×. The TCS3104 is intended for use in a variety of applications including color-point feedback control in solid-state illumination and backlight systems, color adjustment in printers, process controls, diagnostic systems, paper and product handling, toys, and games.