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VV6501 View Datasheet(PDF) - STMicroelectronics

Part Name
Description
MFG CO.
VV6501
ST-Microelectronics
STMicroelectronics ST-Microelectronics
'VV6501' PDF : 60 Pages View PDF
Optical Characteristics
7 Optical Characteristics
VV6501
7.1 Optical characterisation methods
The following measurements are made based on the pixel as summarized in Table 23.
Table 23: VV6501 Pixel overview
Parameter
Value Unit
Size
Architecture
5.6 x 5.6 µm
3T, DDS
Saturation voltage at pixel, VSAT
1.2
V
(Gain x1, 1024 codes)
FD capacitance
3.0
fF
Average sensitivity
The average sensitivity is a measure of the image sensor response to a given light stimulus. The
optical stimulus is a white light source with a color temperature of 3200K, producing uniform
illumination at the surface of the sensor package. For a color sensor, an IR blocking filter, CM500, is
added to the light source. The analog gain of the sensor is set to x1. The exposure time, t, is set
as 50% of maximum. The illuminance, I, is adjusted so the average sensor output code, Xlight, is
roughly mid-range equivalent to a saturation level of 50%. Once Xlight has been recorded the
experiment is repeated with no illumination to give a value Xdark.
The
sensitivity
is
then
calculated
as
X-----l--i--g----h---t---–-----X----d----a---r--k-
t I
.
The
result
is
expressed
in
volts
per
lux-second.
Dark signal
The dark signal is a measure of the effect of pixel leakage current on the sensor output. The
measurement is performed without illumination. As the dark signal is small the analog gain, G, of
the sensor is increased to x4. For the same reason the clock divisor is set to16. As the leakage is
highly temperature dependent, measurement is done at a controlled temperature of 25oC. The
mean sensor output is then recorded at 2 exposure settings: Xdark at the maximum exposure time;
Xblack at zero exposure.
The
dark
signal
is
calculated
as
X-----d----a--r---k----–-----X-----b---l--a---c---k-
t G
and
is
expressed
in
volts
per
second.
Temporal noise of pixel and readout
A measure of the temporal noise is required to quantify the noise floor. As the signal is small the
gain, G, is set to the maximum of x16. In order to remove fixed pattern noise sources it is calculated
as the standard deviation, σblack, of the difference of a pair of zero exposure and zero illumination
images. Random noise is expressed in mV.
Dynamic range
The dynamic range is the measure of the maximum and minimum signal levels at which the sensor
can be used.
The figure for temporal noise is used to find the dynamic range as follows 20 logÿG--σ----b---lV--a---sc---ak---tþ.
48/60
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