Description:
The OPB780 programmable color light-to-frequency converter combines configurable silicon photodiodes and a current-tofrequency converter on single monolithic CMOS integrated circuit. The output is a square wave (50% duty cycle) with frequency directly proportional to light intensity (irradiance). The full-scale output frequency can be scaled by one of three preset values via two control input pins. Digital inputs and digital output allow direct interface to a microcontroller or other logic circuitry. Output enable (OE@) places the output in the high-impedance state for multiple-unit sharing of a microcontroller input line.

Features:
• High-Resolution conversion of Light intensity to Frequency
• Communicates Directly with a Microcontroller
• Single-Supply Operation (2.7V to 5.5V)
• Nonlinearity Error Typically 0.2% at 50 kHz
• Stable 200 ppm/°C Temperature Coefficient

Applications:
• Bill Validation
• Object Color Recognition
• Pill Verification
• Vending Machine Object Verification
• Identification of Paint Color
• Badge Color Identification
• Monitor to Printer Matching
• Etc.