TC255P

336-

× 244-PIXEL CCD IMAGE SENSOR

SOCS057 – JUNE 1996

2-7

POST OFFICE BOX 655303

spurious-nonuniformity specification

The spurious-nonuniformity specification of the TC255P is based on several sensor characteristics:

–

Black

–

White

The CCD sensor is 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 5. In the illuminated condition,

the nonuniformity is specified as a percentage of the total illumination as shown in Figure 6.

The specification for the TC255P is as follows:

WHITE SPOT

(DARK)

WHITE SPOT

(ILLUMINATED)

COLUMN

(DARK)

COLUMN

(ILLUMINATED)

BLACK SPOT

(ILLUMINATED)

WHITE/BLACK†

PAIR

x < 15 mV

x < 15%

x < 0.5 mV

x < 1 mV

x < 15%

x < 9mV

† A white/black pair nonuniformity will be no more than 2 pixels even for integration times of 1/60 second.

The conditions under which this specification is defined are as follows:

white/black pair nonuniformities; in these three cases, the integration time is 1/240 second.

mV

Amplitude

t

Illumination

% of Total

t

%

Figure 5. Pixel Nonuniformity,

Figure 6. Pixel Nonuniformity,

Dark Condition

Illuminated Condition