TC254P Datasheet, PDF (7/16 Pages) Texas Instruments – 336- × 244-pixel ccd image sensor

TC254P
336- × 244-PIXEL CCD IMAGE SENSOR
SOCS060B – JUNE 1997 – REVISED JULY 1998
spurious-nonuniformity specification
The spurious-nonuniformity specification of the TC254P is based on several sensor characteristics:
• Amplitude of the nonuniform pixel
• Polarity of the nonuniform pixel
– Black
– White
• Column amplitude
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 TC254P is as follows:
WHITE SPOT
(DARK)
WHITE SPOT
(ILLUMINATED)
COLUMN
(DARK)
COLUMN
(ILLUMINATED)
BLACK SPOT
(ILLUMINATED)
x < 15 mV
x < 15%
x < 0.5 mV
x < 1 mV
x < 15%
† _{A white/black pair nonuniformity will be no more than 2 pixels even for integration times of 1/60 second.}
WHITE/BLACK†
PAIR
x < 9mV
The conditions under which this specification is defined are as follows:
• The integration time is 1/60 second except for illuminated white spots, illuminated black spots, and
white/black pair nonuniformities; in these three cases, the integration time is 1/120 second.
• The temperature is 45°C.
• The CCD video-output signal is 60 mV ± 10 mV.
mV
%
Amplitude
% of Total
Illumination
t
Figure 5. Pixel Nonuniformity,
Dark Condition
t
Figure 6. Pixel Nonuniformity,
Illuminated Condition
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