NOII4SM6600A-QDC ON Semiconductor, NOII4SM6600A-QDC Datasheet - Page 16

• Manufacturer Part Number: NOII4SM6600A-QDC
• Manufacturer: ON Semiconductor

Specifications of NOII4SM6600A-QDC

• Lead Free Status / Rohs Status: Supplier Unconfirmed

High Dynamic Range Modes
Double Slope Integration
The IBIS4-6600 has a feature called double slope integration to
increase the optical dynamic range of the sensor. The pixel
response can be extended over a larger range of light intensities
by using a "dual slope integration". This is obtained by adding
charge packets from a long and a short integration time in the
pixel during the same exposure time.
response curve of a pixel in dual slope integration mode. The
curve also shows the response of the same pixel in linear
integration mode at the same light levels, with a long and short
integration time.
Dual slope integration is obtained by feeding a lower supply
voltage to VDD_RESET_DS (for example, apply 2.0V). Note that
for normal (single slope) operation, VDD_RESET_DS must have
NonDestructive Read Out (NDR)
The default mode of operation of the sensor is with FPN correction (double sampling). However, the sensor can also be read out in
a nondestructive method. After a pixel is initially reset, it can be read multiple times, without being reset. The initial reset level and all
intermediate signals can be recorded. High light levels saturate the pixels quickly, but a useful signal is obtained from the early
samples. For low light levels, use the later or latest samples. Essentially an active pixel array is read multiple times, and reset only
once. The external system intelligence interprets the data.
nondestructive readout.
1.8
1.6
1.4
1.2
0.8
0.6
0.4
0.2
1
0
0%
Figure 15. Principle of NonDestructive Readout
Figure 14
20%
Figure 14. Double Slope Response
Rev. 9 | www.onsemi.com | Page 16 of 32
shows the
40%
Table 10
the same value as VDD_RESET. The difference between
VDD_RESET_DS and VDD_RESET determines the range of
the high sensitivity, and as a result the output signal level at
which the transition between high and low sensitivity occurs.
Put the amplifier gain to the lowest value where the analog output
swing covers digital input swing of the ADC. Increasing the
amplification too much may boost the high sensitivity part over
the whole ADC range.
The electronic shutter determines the ratio of integration times of
the two slopes. The high sensitivity ramp corresponds to "no
electronic shutter", thus maximal integration time (frame read out
time). The low sensitivity ramp corresponds to the electronic
shutter value that is obtained in normal operation.
on page 17 summarizes the advantages and disadvantages of
60%
Relative exposure (arbitrary scale)
Dual slope operation
Long integration time
Short integration time
80%
time
100%
NOII4SM6600A