The TSL237T light-to-frequency converter combines a silicon photodiode and a current-to-frequency converter on a single monolithic CMOS integrated circuit.
Output is a square wave (50% duty cycle) with frequency directly proportional to light intensity (irradiance) on the photodiode.
Key Features
accuracy may be obtained using frequency-measurement, pulse-accumulation, or integration techniques. Frequency measurements provide the added benefit of averaging out random- or high-frequency variations (jitter) resulting from noise in the light signal. Resolution is limited main.
Full PDF Text Transcription for TSL237T (Reference)
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TSL237T. For precise diagrams, and layout, please refer to the original PDF.
r r D High-Resolution Conversion of Light Intensity to Frequency With No External Components D High Irradiance Responsivity . . . 1.2 kHz/(mW/cm2) at λp = 640 nm D Low Da...
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Irradiance Responsivity . . . 1.2 kHz/(mW/cm2) at λp = 640 nm D Low Dark Frequency . . . < 2 Hz at 505 C D Single-Supply Operation . . . 2.7 V to 5.5 V D Stable 200 ppm/°C Temperature Coefficient D Communicates Directly with a Microcontroller D RoHS Compliant TSL237T HIGH-SENSITIVITY LIGHT-TO-FREQUENCY CONVERTER TAOS055J − DECEMBER 2007 PACKAGE T 4-LEAD SMD (TOP VIEW) OE 1 4 OUT GND 2 3 VDD Technical coantmesntAsGtill valid Description The TSL237T light-to-frequency converter combines a silicon photodiode and a current-to-frequency converter on a single monolithic CMOS integrated circuit.
TSL237T Datasheet
