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SFH5711 Datasheet(PDF) 5 Page - OSRAM GmbH |
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SFH5711 Datasheet(HTML) 5 Page - OSRAM GmbH |
5 / 8 page 29.06.2006 page 5 of 8 Sensitivity Variation Due to the manufacturing process ambient light sensors of different production lots will yield different outputs for the same illuminance. The magnitude of this sensitivity variation depends on the sensor type. To account for this, some ambient light sensors are offered in defined sensitivity bins. These are described in the datasheets and in the application notes of the respective sensors. The sensitivity variation can also be overcome by calibrating the assembled unit in the production line. Accuracy of the ambient light measurement Several factors determine the accuracy of an ambient light measurement: • Spectral sensitivity: High detector sensitivity for IR results in low accuracy of the brightness measurement. • Temperature coefficient: The output current of photo detectors varies with the operating temperature. Large temperature coefficients result in brightness measurement deviations at very high and low temperatures. • Linearity: Linearity describes the deviation from the photo current - illuminance correlation function. • Sensitivity variation • System errors such as resistors, calibration, etc. Each of these effects contributes with different magnitude to the ambient light measurement accuracy. Table 2 provides an overview of these characteristics for different detector types. Different types of ambient light sensors OSRAM OS offers three different types of ambient light sensors. Table 2 provides a selection guide for the different types and gives an overview of these types with their main criteria. Phototransistor Photodiode Opto Hybrid (Diode + IC) Device SFH 3410, SFH 3710 SFH 2430 SFH 5711 Output signal high low high Linearity good highest high 3 Temperature coefficient high lowest low Sensitivity variation Factor 1:2 in illuminance per sensitivity bin +-15% Factor 1:2 in illuminance per sensitivity bin Photo current – illuminance correlation Linear Linear Logarithmic (high accuracy over entire dynamic range) Spectral sensitivity Low IR contribution Low IR contribution perfect V- λ characteristic Size Small Large medium Table 2: Selection guide for OSRAM ambient light sensors. Different types with their main characteristics. 3 For the SFH 5711, this term refers to the deviation from the logarithmic curve. |
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