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S3922 Datasheet(PDF) 6 Page - Hamamatsu Corporation

Part # S3922
Description  NMOS linear image sensor
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Manufacturer  HAMAMATSU [Hamamatsu Corporation]
Direct Link  http://www.hamamatsu.com
Logo HAMAMATSU - Hamamatsu Corporation

S3922 Datasheet(HTML) 6 Page - Hamamatsu Corporation

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NMOS linear image sensor
S3922/S3923 series
Vscg
Vss
Vsub
NC
EOS
EOS
10 k
Ω
+5 V
+5 V
+
OPEN
Dummy
video
Active
video
Reset
+2.5 V
Reset V
(Vscd)
+
+
+15 V
Rs 10 k
Ω
Rf
Vdd
st
2
1
st
2
1
Reset
Reset
st
2
1
■ Anti-blooming function
If the incident light intensity is higher than the saturation charge level, even partially, a signal charge in excess of the saturation
charge cannot accumulate in the photodiode. This excessive charge flows out into the video line degrading the signal purity. To
avoid this problem and maintain the signal purity, applying the same voltage as the Reset V voltage to the saturation control drain
and grounding the saturation control gate are effective. If the incident light intensity is extremely high, a positive bias should be
applied to the saturation control gate. The larger the voltage applied to the saturation control gate, the higher the function for
suppressing the excessive saturation charge will be. However, this voltage also lowers the amount of saturation charge, so an
optimum bias voltage should be selected.
■ Auxiliary functions
1) All reset
In normal operation, the accumulated charge in each photodiode is reset when the signal is read out. Besides this method that
uses the readout line, S3922/S3923 series can reset the photodiode charge by applying a pulse to the saturation control gate.
The amplitude of this pulse should be equal to the
φ1, φ2, φst, Reset φ pulses and the pulse width should be longer than 5 μs.
When the saturation control gate is set at the “High” level, all photodiodes are reset to the saturation control drain potential
(equal to video bias). Conversely, when the saturation control gate is set at the “Low” level (0 V), the signal charge accumulates
in each photodiode without being reset.
2) Dummy video
S3922/S3923 series have a dummy video line. Positive-polarity video signals with the DC offset remove can be obtained by
differential amplification of the active video line and dummy video line outputs. When not needed, leave this unconnected.
■ Precautions for using NMOS linear image sensors
1) Electrostatic countermeasures
NMOS linear image sensors are designed to resist static electrical charges. However, take sufficient cautions and countermea-
sures to prevent damage from static charges when handling the sensors.
2) Window
If dust or grime sticks to the surface of the light input window, it appears as a black blemish or smear on the image. Before using
the image sensor, the window surface should be cleaned. Wipe off the window surface with a soft cloth, cleaning paper or
cotton swab slightly moistened with organic solvent such as alcohol, and then lightly blow away with compressed air. Do not
rub the window with dry cloth or cotton swab as this may generate static electricity.
KMPDC0027EA
KMPDC0028EA
■ Readout circuit example
6
■ Timing chart


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