
TC221, TC225, TC227
SMALL-FORMAT CCD IMAGE SENSORS
SOCS037C – DECEMBER 1991 – REVISED AUGUST 1997
8
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
spurious-nonuniformity specification
The spurious-nonuniformity specification of the TC221, TC225 and TC227 grades – 30 and – 40 is based on
several sensor characteristics:
Amplitude of the nonuniform pixel
Polarity of the nonuniform pixel
— Black
— White
Location of the nonuniformity (see Figure 5)
Nonuniform pixel count
The CCD sensors are characterized in both an illuminated condition and a dark condition. In the dark condition,
the nonuniformity is specified in terms of absolute amplitude as shown in Figure 6. In the illuminated condition,
the nonuniformity is specified as a percentage of the total illumination as shown in Figure 7.
TC221 nonuniformity table
DARK CONDITION
ILLUMINATED CONDITION
PART NUMBER
PIXEL
PIXEL COUNT
% OF TOTAL
PIXEL COUNT
AMPLITUDE
AREA A
AREA B
ILLUMINATION
AREA A
AREA B
TC221-30
812 mV
4
6
30 40
4
6
TC221-40
8 –12 mV
8
12
30 – 40
8
12
TC221-30
12 16 mV
2
4
40 50
2
4
TC221-40
12 –16 mV
4
8
40 – 50
4
8
TC221-30
>16mV
0
>50
0
TC221-40
> 16 mV
0
> 50
0
TC225 nonuniformity table
DARK CONDITION
ILLUMINATED CONDITION
PART NUMBER
PIXEL
PIXEL COUNT
% OF TOTAL
PIXEL COUNT
AMPLITUDE
AREA A
AREA B
ILLUMINATION
AREA A
AREA B
TC225-30
812 mV
6
9
30 40
6
9
TC225-40
8 –12 mV
12
15
30 – 40
12
15
TC225-30
12 16mV
3
6
40 50
3
6
TC225-40
12 –16mV
6
10
40 – 50
6
10
TC225-30
>16mV
0
>50
0
TC225-40
> 16 mV
0
> 50
0
TC227 nonuniformity table
DARK CONDITION
ILLUMINATED CONDITION
PART NUMBER
PIXEL
PIXEL COUNT
% OF TOTAL
PIXEL COUNT
AMPLITUDE
AREA A
AREA B
ILLUMINATION
AREA A
AREA B
TC227-30
812 mV
4
6
30 40
4
6
TC227-40
8 –12 mV
8
12
30 – 40
12
TC227-30
12 16 mV
2
4
40 50
2
4
TC227-40
12 –16 mV
4
8
40 – 50
4
8
TC227-30
>16mV
0
>50
0
TC227-40
> 16 mV
0
> 50
0