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.