upd8670a Renesas Electronics Corporation., upd8670a Datasheet - Page 15

• Manufacturer Part Number: upd8670a
• Description: 7400 Pixels Ccd Linear Image Sensor
• Manufacturer: Renesas Electronics Corporation.

DEFINITIONS OF CHARACTERISTIC ITEMS
1. Saturation voltage : V
2. Saturation exposure : SE
3. Photo response non-uniformity : PRNU
4. Average dark signal : ADS
Output signal voltage at which the response linearity is lost.
Product of intensity of illumination (lx) and storage time (s) when saturation of output voltage occurs.
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 (%) =
Average output signal voltage of all the valid pixels at light shielding. This is calculated by the following formula.
ADS (mV) =
∆x
7400
j = 1
x
7400
Σ
d
× 100
j
d
∆x: maximum of x
sat
j
x =
x
: Dark signal of valid pixel number j
j
: Output voltage of valid pixel number j
Register dark
7400
j = 1
7400
Σ
V
DC level
x
OUT
j
j
− x 
Data Sheet S17147EJ2V0DS
∆x
x
µ
PD8670A
15