# TSL237 HIGH-SENSITIVITY LIGHT-TO-FREQUENCY CONVERTER

## Overview
The TSL237 is a light-to-frequency converter combining a silicon photodiode and a current-to-frequency converter on a single CMOS integrated circuit. Output is a square wave with frequency directly proportional to light intensity.

## Key Features
️· High Resolution Conversion of Light Intensity to Frequency
️· High Irradiance Responsivity: 2.3 kHz/(µW/cm²) at λp = 524 nm
️· Low Dark Frequency: < 2 Hz at 50°C
️· Single-Supply Operation: 2.7 V to 5.5 V
️· Stable 200 ppm/°C Temperature Coefficient
️· Interfaces Directly to a Microcontroller
️· RoHS Compliant (-LF Package Only)

## Electrical Characteristics
️· Supply Voltage (VDD): 2.7 - 5.5V
️· Output Frequency: proportional to light intensity
️· Full-Scale Frequency: 500-1000 kHz

## Package Options
️· Package S: 3-lead Sidelooker (clear plastic)
️· Package SM: 3-lead Surface-Mount Sidelooker (clear plastic)
️· Available in lead (Pb) free options (-LF suffix).

## Absolute Maximum Ratings
️· Supply Voltage: 6V
️· Operating Temperature: -25°C to 85°C
️· Storage Temperature: -40°C to 85°C

## Operational Details
️· Output frequency (fO) = fD + (Re) * (Ee), where fD is dark frequency, Re is responsivity, and Ee is irradiance.
️· Designed to drive CMOS logic inputs.

## Mechanical Data
️· Available in through-hole and surface-mount packages.
️· Detailed package dimensions provided in the datasheet.

## Production & Compliance
️· RoHS compliant versions available.
️· Products conform to Texas Advanced Optoelectronic Solutions, Inc. standard warranty.