TC246 Datasheet, PDF (11/30 Pages) Texas Instruments – 680 x 500 PIXEL IMPACTRON™ COLOR CCD IMAGE SENSOR

TC246
www.ti.com
SOCS096 – JULY 2010
OPTICAL CHARACTERISTICS (continued)
T_A = 25°C, integration time = 16.67 ms (unless otherwise noted)
PARAMETER
TEST CONDITIONS
Column uniformity⁽⁸⁾
Electronic-shutter capability
Defect ⁽⁹⁾
Dark (zone A) (see Figure 1), -15°C,
CCM gain 100
Exceed 20mV
12mV to 20mV
Vertical belt noise⁽¹⁰⁾
Horizontal streaking⁽¹¹⁾
Illuminated (zone A) (see Figure 1), 25°C, 100-mV output
-15°C, CCM gain 1000
-15°C, CCM gain 1000
MIN
1/2000
-20
TYP MAX
2
1/30
0
10
20
6
70
UNIT
%
s
dot
%
mV
mV
(8) Column uniformity is obtain by summing all the lines in the array, finding the maximum of the difference of two neighboring columns
anywhere in the array, and dividing the result by the number of lines.
(9) There shall be no pixel defect which continued horizontally.
(10) Vertical belt noise is dark current from CMG stage, when CCD generates CMG 1000 times with -15°C at thermistor. When 0 digress,
this value is multiplied by about 2.5 times. These values are under the condition of non-aging test when factory out.
(11) Streaking is a phenomenon that pixel in the right of blight pixels which are generated by huge light intensity source responses blighter
data, when CCD generates CMG 1000 times with -15°C at thermistor. When 0°C, this value is multiplied by about 0.8 times. These
values are under the condition of non-aging test when factory out.
How to Check Pixel Error Under Blight Condition
This value is calculated using Equation 1:
error(%) = ^{| Vout_normal – Vout_error | – Vout_OB} × 100
Vout_normal – Vout_OB
(1)
Analog
video output
Vout_normal
Vout_OB
Vout_error
(Max)
Vout_error
(Min)
Basis voltage (e.g., GND)
Vout_xx means analog video output voltage (mV) at the several pixels. Vout_error is at error pixel, Vout_normal
is at non-error pixel, and Vout_OB is at Optical Black pixel. This test is done when CCD receives white light
whose intensity becomes about 60mV video data value at non-error pixel, which is calculated by (Vout_normal -
Vout_OB).
Figure 1. Defect Area
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