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TC255P Arkusz danych(PDF) 7 Page - Texas Instruments |
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TC255P Arkusz danych(HTML) 7 Page - Texas Instruments |
7 / 18 page TC255P 336- × 244-PIXEL CCD IMAGE SENSOR SOCS057A – JUNE 1996 – REVISED MARCH 2003 7 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 spurious-nonuniformity specification The spurious-nonuniformity specification of the TC255P 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 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: • 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 1/240 second. • The temperature is 45°C. • The CCD video-output signal is 60 mV ± 10 mV. mV Amplitude t Illumination % of Total t % Figure 5. Pixel Nonuniformity, Figure 6. Pixel Nonuniformity, Dark Condition Illuminated Condition |
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