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MT9T031: 1/2-Inch 3-Mp Digital Image Sensor
Feature Description
Signal Path
The MT9T031 sensor analog signal path consists of the pixel array, the column sample
and hold (S/H) circuitry, the programmable gain stage, the analog offset correction, and
the analog-to-digital converter (ADC).
The reset and signal voltages from the pixel are sampled onto the column sample and
hold circuitry by row. After signal sampling is complete, the differential signal
(reset - signal) is transferred to the programmable gain stage.
After the gain stage, the differential signal goes through the analog offset correction
circuitry. The user can decide if a positive or negative offset or no offset needs to be
added to the differential signal. The signal is then sampled onto the sample and hold
circuitry of the ADC before being converted to a digital signal.
Figure 7:
Signal Path
-
Analo g G ain
( c olor-wise)
Di g ital Offset
( c olor-wise)
Pixel Volta g e
X
+
10- b it AD C
X
+
D OUT [9:0]
Analo g Offset
( c olor-wise)
Bla c k Level
Di g ital G ain
( c olor-wise)
C ali b ration
Gain Settings
The analog programmable gain stage consists of two stages of gain that operate in a
pipelined manner. The first stage has programmable gain of 1 or 2 while the second
stage has programmable gain of 1 to 4 with steps of 0.125, for a maximum analog gain of
8. The gain settings can be adjusted independently for the colors of green1, blue, red,
and green2.
Black Level Calibration
The digital black level of the MT9T031 sensor potentially varies with temperature or gain
setting changes. The MT9T031 sensor enables the flexibility of automatic black level
calibration or manual black level control.
Manual Black Level Calibration
The programmable analog offset stage corrects for analog offset that might be present in
the analog signal. The analog offset settings can be independently adjusted for the
colors of green1, green2, red, and blue.
Black Level
Digital offset is applied such that the average black level of a frame in a resulting image
equals the value of this register. This adjustment happens after black-level calibration.
PDF: 09005aef824c997f/Source: 09005aef824c998a
MT9T031_3100_PB_2.fm - Rev. A 8/06 EN
7
Micron Technology, Inc., reserves the right to change products or specifications without notice.
?2006 Micron Technology, Inc. All rights reserved.
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