MT9V403 datasheet(12/33 Pages) MICRON

12 / 33 page

1/2-INCH VGA (WITH FREEZE-FRAME) CMOS

ACTIVE-PIXEL DIGITAL IMAGE SENSOR

09005aef80c07280

Micron Technology, Inc., reserves the right to change products or specifications without notice.

MT9V403_DS.fm - Rev. B 1/04 EN

To increase intrascene dynamic range of the sensor

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/

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.

Figure 17: Extended High Dynamic Range Timing in Slave Mode

Figure 18: Output Signal vs. Photocurrent

TX_N

PG_N

DATA [9:0]

Exposure

XXX

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(

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(

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Readout Time

Iph

Signal

ADC saturation level

Compressed

region

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