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ams extends digital multispectral offering

ams has launched the AS7265X, an 18-channel multispectral sensor solution, suitable for a broad range of spectral sensing application.

The visible through near-infrared chipset is intended for emerging spectral sensing applications such as horticulture, fluid quality/spectral component analysis and complex spectral identification, including anti-counterfeiting and authentication.

The chipset consists of 3 highly integrated 6-channel sensor devices, each only 4.5 x 4.4 x 2.5mm, in efficient land-grid array packages with integrated apertures. The master-slave-slave architecture appears as a single logical device, simplifying system integration and reducing time to market. The 18-channels span wavelengths from 410 to 940nm with 20nm filter widths.

The AS7265x is the first multichip set from ams to incorporate nano-optical interference filters deposited directly on the CMOS silicon die cost-effectively enough to open entirely new application opportunities. This interference filter technology delivers precise and reproduceable filter characteristics, which are stable over both time and temperature and are much smaller than the typical component solutions needed for higher channel count spectral analysis instruments.

The AS72651/652/653 chipset is calibrated at the factory, delivering a normalised 35 counts/µW/cm2 across the entire sensed spectrum, simplifying algorithm development and elimina-ting the need in many applications for end device calibration.

Combined with the high filter stability over time and temperature, this allows a “calibrated-for-life” design that lowers both components and manufacturing costs, and enables these new application spaces.

The chipset is implemented in a master/slave/slave arrangement, each with six spectral sensing channels. Integrated intelligence enables the calibrated digital output and manages the interface to the host microprocessor via the selectable choice of I2C or UART interfaces. The combined set’s 18 channels are 20nm full-width-half-max, with wavelength centre points at 410, 435, 460, 485, 510, 535, 560, 585, 610, 645, 680, 705, 730, 760, 810, 860, 900 and 940nm.

Operating as a 3-chip set, the devices include electronic shutter capabilities with 3 independent100mA LED drive controls, which means that device designers can now accurately control multiple light sources to enhance the spectral sensing functions without the need for added componentry.

Neil Tyler

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