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AS7421

Electrical Characteristics

Datasheet

• PUBLIC

DS000667

• v1-00 • 2022-Aug-25

│ 11

Figure 7:

Optical Characteristics of AS7421, Integration Time = 65.5 ms (unless otherwise noted)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

FWHM

Full width half maximum of

filter (8)

Peak Wavelength

Separation

dark

Dark ADC count value

Ee = 0

μW/cm²

AGAIN: 128x

Integration time: 65.5 ms

counts

Gain ratio

Optical gain ratios, relative

to 1x gain setting

AGAIN: 1x

AGAIN: 2x

AGAIN: 4x

AGAIN: 8x

AGAIN: 16x

AGAIN: 32x

AGAIN: 64x

AGAIN: 128x

128

AGAIN: 256x

256

SNRSYSTEM

Signal to noise ratio of

optical system (1) (2)

Range:750 nm

– 1050 nm

500

ImSR

Intra-module spectral

repeatability (1) (3)

Range:750 nm

– 1050 nm

0.5

IMSR

Inter-module spectral

repeatability (1) (4)

Range:750 nm

– 1050 nm

Wacc

Wavelength accuracy (1) (7)

tint

Integration time (5)

0.5

65.5

256

t64CH

Measurement time for all 64

channel (6)

4 x tint

Field of view of

single photo diode

-10

deg

(1)

Parameter not tested in final test but guaranteed by design and validation.

(2)

Verified with raw spectral data collected with reflectance standard sample (RSS) with reflectance of 99% (white diffusive

target). Average and standard deviation is calculated for each channel (

CH) for 10 measurements. SNRSYSTEM = µ(λCH) /

σ(λ

CH)

(3)

Verified with raw spectral data collected with reflectance standard sample (RSS, 10 measurements per channel) with

reflectance of 99% (white diffusive target) and wavelength calibration standard zenith polymer (WCS, 100

measurements per channel).

(4)

Verified with raw spectral data collected with reflectance standard sample (RSS, 10 measurements per channel for 10

devices) with reflectance of 99% (white diffusive target) and wavelength calibration standard zenith polymer (WCS, 100

measurements per channel for 10 devices).

(5)

65.5 ms integration time to achieve 16-bit count value (depending on amount of light reflected to sensor)

(6)

4 integration cycles are done automatically to process all 64 channels

(7)

Verified after full sensor calibration. Raw spectral data recorded for each channel with wavelength calibration standard

zenith polymer (WCS, 10 measurements per channel).

(8)

Parameter verified with collimated light at 0° AOI (angle of incidence)

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