LUPA-1300 CYPRESS [Cypress Semiconductor], LUPA-1300 Datasheet - Page 14

• Manufacturer Part Number: LUPA-1300
• Description: 1.3 M Pixel High Speed CMOS Image Sensor
• Manufacturer: CYPRESS [Cypress Semiconductor]

3.1 Pixel architecture
The active pixels allow synchronous shutter “i.e. all pixels are illuminated during the
same integration time, starting from the same moment in time. After a certain
integration time, the pixels are readout sequentially. Readout and integration are in
parallel, which means that when the image sensor is readout, the integration time for
the next frame is ongoing. This feature requires a memory element inside the pixel,
which affects the maximum fill factor. A schematic representation of the pixel is
given in figure 4.
The photodiode is designed to obtain sensitivity as high as possible for a dynamic
range of at least 60dB. Consequently the photodiode capacitance is 10fF @ the
output, resulting in a S/N of more than 60dB as the rms noise level is within the
expectation of 45 noise electrons. The pixel was specially designed to have a very low
parasitic light sensitivity (<0.5%). The pixels are based on the high-fill factor active
pixel sensor technology of FillFactory (US patent No. 6,225,670 and others)).
Cypress Semiconductor Corporation
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The signals mentioned in figure 4 are the internal signals, generated by the internal
Figure 4: schematic representation of the synchronous pixel as used in the LUPA
LUPA-1300
Datasheet
drivers, required to have the synchronous shutter feature .
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Document # : 38-05711 Rev.**( Revision 3.1)
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