UPD8821 Datasheet, PDF (13/24 Pages) NEC – 7300 PIXELS × 3 COLOR CCD LINEAR IMAGE SENSOR

μ PD8821
DEFINITIONS OF CHARACTERISTIC
1. Saturation voltage : Vsat
Output signal voltage at which the response linearity is lost.
2. Saturation exposure : SE
Product of intensity of illumination (lx) and storage time (s) when saturation of output voltage occurs.
3. Photo response non-uniformity : PRNU
The output signal non-uniformity of all the valid pixels when the photosensitive surface is applied with the light of
uniform illumination. This is calculated by the following formula, and it is defined by each six of them.
Δx
PRNU (%) =
x
× 100
Δx : maximum of | xj − x |
3650
Σxj
j=1
x = ₃₆₅₀
VOUT
Register Dark
x
DC level
Δx
4. Average dark signal : ADS
Average output signal voltage of all the valid pixels at light shielding. This is calculated by the following formula,
and it is defined by each six of them.
ADS (mV) =
3650
Σdj
j=1
3650
dj : Dark signal of valid pixel number j
Data Sheet S17961EJ2V0DS
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