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AS73211

Application Notes

Datasheet

• PUBLIC

DS000556

• v3-01 • 2018-Feb-07

│ 61

Application Notes

13.1

Narrowband Luminous Sources

The spectral filters of the color sensors are specialized for applications with broadband source of

lighting >10nm. Please ask our sales team before utilizing our sensor in combination with narrowband

luminous sources.

13.2

Angle of Incidence

The packaging of the sensor IC has an aperture angle (beam width) of nearly 90°. Traditional

interference filter work depending on angle of incidence. Using an angle of incidence < 10° allows the

best results with no filter shifts. This can be ensured by using lenses or optical holes that limit the

angle of incidence to the sensor device < 10°. An angle of incidence of more than 10° results in a filter

shift. The filter response and accuracy is distorted the greater the angle deviation is. Please note a

filter deviation resulting from this fact can differ from standard observer function and/or from the filter

functions specified in this document. Please ask our sales team for support.

13.3

Effects of Temperature

The specified operation temperature range and documented parameters regarding temperature

influence are described in chapter “Absolute Maximum Ratings”. The functionality of the filters do not

depend on any temperature changes. The temperature coefficient of the photo sensitivity and the dark

current of the photodiodes need to be considered

, since these have an influence on the sensor’s

response in case of changing temperature.

13.4

Notes for Manufacturing

JENCOLOR® sensors are optoelectronic components operating at high precision, resolution and

smallest currents of nA in operation and pA in standby. This must be considered in the development

and manufacturing. So mechanical stress, EMC, dirt and moisture must be avoided.

For manufacturing purposes we recommend completely removing moisture and dirtying (dirt and

residue solder as solder) on the boards with JENCOLOR® sensors. This refers to residual moisture

on / below the sensor and converter. In sensor operations residual moisture or residues of solder can

lead to leakage currents and result in increased offset values. Offset means a lower resolution, lower

accuracy and measuring inaccuracies in sensor mode. These have particular impact on small

measurement signals from the sensor. If cleaning of a PCB with water is necessary then make sure to

fully dry the board later on with suitable processes and technologies (e.g. baking 120°C, over 24h).

This avoids residual moisture as reason for leakage currents and noise.

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