MT9V403 Micron, MT9V403 Datasheet - Page 12

• Manufacturer Part Number: MT9V403
• Description: 1/2-INCH VGA (WITH FREEZE-FRAME) CMOS ACTIVE-PIXEL DIGITAL IMAGE SENSOR
• Manufacturer: Micron

in slave mode, the user can implement dual sampling.
This is possible by applying an additional TX pulse
during the integration period. By doing this, one com-
bines two photo signals after different exposures.
Figure 17 shows an example of the timing. N1 is the
number of rows in the first exposure. N2 is the number
of rows in the second exposure. N1 = 502 for the full
frame exposure time. The intrascene dynamic range
capability of the sensor is extended by the factor N1/
09005aef80c07280
MT9V403_DS.fm - Rev. B 1/04 EN
To increase intrascene dynamic range of the sensor
Figure 17: Extended High Dynamic Range Timing in Slave Mode
DATA [9:0]
PG_N
TX_N
Figure 18: Output Signal vs. Photocurrent
Signal
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1/2-INCH VGA (WITH FREEZE-FRAME) CMOS
Compressed
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ACTIVE-PIXEL DIGITAL IMAGE SENSOR
Readout Time
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N1
N2. For N1 = 500 and N2 = 2, the dynamic range
enhancement is approximately 48 dB. Figure 18 shows
output signal vs. photocurrent. The knee point is
dependent on the VRSTLOW bias, which determines
the charge capacity of the photodiode. The saturation
level of photodiode must be less than the saturation
level of the ADC. Setting VRSTLOW to 1.2V is enough
for the default gain settings. The slope of the curve
after the knee point or compression level is deter-
mined by the N1/N2 ratio.
Exposure
ADC saturation level
Micron Technology, Inc., reserves the right to change products or specifications without notice.
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©2004 Micron Technology. Inc.