µPD3739
DEFINITIONS OF CHARACTERISTIC ITEMS
1. Saturation voltage: Vsat
Output signal voltage at which the response linearity is lost.
2. Saturation exposure: SE
Product of intensity of illumination (IX) 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.
PRNU (%) =
∆x
x
× 100
∆x : maximum of xj − x
25700000
Σ∑ xxj j
xx ==
j j==11
52070000
xj : Output voltage of valid pixel number j
VOUT
x
Register Dark
DC level
∆x
4. Average dark signal: ADS
Average output signal voltage of all the valid pixels at light shielding. This is calculated by the following formula.
5000
Σ∑2700dj
j = 1 dj
ADS (mV) =
ADS (mV) =
5j=0100
2700
dj : Dark signal of valid pixel number j
14