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NOIH2SM1000A
This register sets the PGA output offset and gain. The
PGA output signal offset is controlled in 64 steps of 16 mV
each, from 0.3 V to 1.3 V. Output offset control is used to
adapt the PGAs output to the ADC used (internal or external
ADC). See Other Definitions on page 14.
For unity gain and internal ADC use, the recommended
default setting is:
AMP_OFFSET = 60
BLACK Register:
The reset value of AMP.Offset is 0, decoding to the middle
offset value of 0.8 V. AMP.Offset range 0 to 31 corresponds
to levels of 0.8 to 1.3 V, while AMP.Offset range 32 to 63
corresponds to levels of 0.3 to 0.8 V.
Gain is controlled in 4 steps for nominal values of 1,2,4,
and 8. Real gain values are expected to be somewhat lower
and will be characterized.
BLACK
A[7..0] = BLACK[7..0]
BLACK[7..0]
A[9..8] = “10”
NDR mode black level
LD_REG
The BLACK register sets the black level of the column
amplifier structures and column pre-chargers when used in
NDR mode.
The reset value of BLACK is 0, setting the internal black
level to half-way full scale: BLACK range 0..127
OFFSET Register:
corresponds to 1.65 V to 2.9 V in steps of 10 mV. BLACK
range 128 to 255 corresponds to 0.4 V to 1.65 V in steps of
10 mV.
The recommended default setting is: BLACK = 10
OFFSET
A[7..0] = OFFSET[7..0]
OFFSET[7..0]
A[9..8] = “11”
Column bus offset correction.
LD_REG
The column signal path and later parts of the signal path
is split in an odd bus with amplifiers and an even bus with
amplifiers.
Using the OFFSET register, the offsets for these two
signal paths can be calibrated to obtain a balanced
performance.
The reset value of OFFSET is 0, driving the offset
generator to half-scale (0 mV). OFFSET range 0 to 127
corresponds to 0 to +17.5 mV in steps of 140 m V. OFFSET
Sensor Calibration
NDR Mode Black Level
BLACK=10.
Column Amplifier Offset Correction
The column amplifier structures comprise of two
independent signal buses, one handling pixels from odd
columns, one handling pixels from even columns.
As these structures are inherently imperfectly matched in
offset, user calibration of this parameter is required when the
sensor is operated in destructive readout / double sampling
mode.
The default (reset) values for this parameter puts the
internal calibration signal generators in their neutral,
middle-value mode.
range 128 to 255 corresponds to –17.5 mV to 0 mV in steps
of 137 m V.
Expressed in electrons, this gives the following numbers:
Total offset correction range: 2365 electrons
Step of correction: 9.3 electrons
The recommended default setting is:
OFFSET = 0 (sample depended).
It’s recommended to calibrate the device while taking a
dark image.
ADC Corrections
Concept
The ADC is a pipelined device with 11 identical
conversion stages in series. Each conversion stage is built
around an amplifier with gain that can be calibrated. Each
amplifier ’s gain can be tuned individually with an 8 bit code,
totaling 11 words of 8 bits to be loaded into the ADC through
a separate serial interface.
ADC Tuning Codes
Tuning codes each span the range 0 to 255, with value 127
denoting the amplifier ’s central gain setting (default after
power-on, i.e. without user calibration, and allowing
nominal operation of the device). Code 0 reduces the gain
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