Texas Advanced Optoelectronic Solutions (Taos) Inc. is offering a light-to-frequency converter housed in an 8-pin SOIC surface-mount package. The TSL238 does not require an external analog-to-digital converter because its output is a waveform whose frequency is directly proportional to the light intensity, so that the device interfaces directly to a microprocessor. It is lead-free and RoHS-compliant. The device features a dynamic range of >90 dB at room temperature and a temperature range of –25 to 70 °C. It is temperature-compensated for the UV-VIS range of 320 to 700 nm and responds over the UV-VIS-IR range of 320 to 1050 nm. It combines a silicon photodiode and a current-to-frequency converter on a single monolithic CMOS integrated circuit.

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