TC245

786-

× 488-PIXEL CCD IMAGE SENSOR

SOCS019A – DECEMBER 1991

2-12

POST OFFICE BOX 655303

PARAMETER

MIN

TYP

MAX

UNIT

Sensitivity

No IR Filter

Measured at VU

197

mV/lx

Sensitivity

With IR Filter

Measured at VU

(see Notes 10 and 11)

24

mV/lx

Saturation signal, Vsat (see Note 12)

Antiblooming disabled, interlace off

320

mV

Maximum usable signal, Vuse

Antiblooming enabled, interlace on

180

mV

Blooming overload ratio (see Note 13)

Interlace on

100

Blooming overload ratio (see Note 13)

Interlace off

200

Image-area well capacity

80 x 103

electrons

Smear (see Note 14)

See Note 15

0.0004

Dark current

Interlace off

TA = 21°C

0.027

nA/cm2

Dark signal (see Note 16)

TA =45°C

TC245-30

5.5

mV

Dark signal (see Note 16)

TA = 45°C

TC245-40

6

mV

Pixel uniformity

Output signal = 50 mV

±10 mV

TC245-30

3.5

mV

Pixel uniformity

Output signal = 50 mV

±10 mV

TC245-40

5

mV

Column uniformity

Output signal = 50 mV

±10 mV

TC245-30

0.5

mV

Column uniformity

Output signal = 50 mV

±10 mV

TC245-40

0.7

mV

Shading

Output signal = 100 mV

15%

NOTES: 10. Sensitivity is measured at an integration time of 16.67 ms with a source temperature of 2856 K. A CM-500 filter is used.

11. VU is the output voltage that represents the threshold of operation of antiblooming. VU ≈ 1/2 saturation signal.

12. Saturation is the condition in which further increase in exposure does not lead to further increase in output signal.

13. Blooming overload ratio is the ratio of blooming exposure to saturation exposure.

14. Smear is a measure of the error induced by transferring charge through an illuminated pixel in shutterless operation. It is equivalent

to the ratio of the single-pixel transfer time during a fast dump to the exposure time using an illuminated section that is 1/10 of the

image- area vertical height with recommended clock frequencies.

15. Exposure time is 16.67 ms, the fast-dump clocking rate during vertical timing is 3.58 MHz, and the illuminated section is 1/10 of the

height of the image section.

16. Dark-signal level is measured from the dummy pixels.