Digital SpO2 Sensors Explained
Explanation of digital SpO2 sensors, analog SpO2 sensors, photodetectors and digital light-to-frequency converter sensor designs.
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Overview and Application Notes
Digital SpO2 sensor There are two major schools of SpO2 sensors in terms of working mechanism: 1, Analog and digital; When we refer to "analog" SpO2 sensor, the SpO2 sensor is equipped with a photodetector; and when we refer to "digital" SpO2 sensor, it is equipped with a digital light-to-frequency converter.
Technical data are available in OSI company website and Texas Instruments website: http://www.osioptoelectronics.com/Libraries/Product-Data-Sheets/Dual-LED-Assemblies.sflb.ashx http://www.ti.com/lit/ds/symlink/tsl235.pdf 2, How to tell?
As you can read from the technical data, the appearance of the photodetector chip for analog and digital SpO2 sensors are different; The active area (black part) of photodetector is much bigger and the light-to-frequency converter.
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Quality and Compatibility Notes
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