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Flare 12M CXP User's Manual
Analog Gain
Register
Gain
0
x 1 (0 dB)
1
x 2 (+6.0 dB)
2
x 3 (+9.5 dB)
Table 14. Analog gain settings
3.6.4 Digital Gain
A digital gain can be applied using the Digital Gain register. The digital gain value is a 4.10
unsigned fixed point multiplier. The factory profile default is 0x0400, which is equal to unity
gain. The maximum gain is 0x3FFF (15.9990) or +24.08 dB. The digital gain setting can also
be set less than 1x, with a minimum setting of 0x0001 (0.00098) or -60.21 dB.
Negative gain can be used to compress very small pixel values in low light settings. Another
use of negative gain is to slightly change the camera response but keep the exposure time
constant. Using the Auto Exposure and Gain Control (AEC) the exposure time can remain
constant by setting the minimum and maximum auto exposure times to the same value, and
the minimum and maximum auto exposure gain values can be set centered around unity gain.
3.6.5 ADC Gain
The sensors in the Flare CXP camera series use column ramp Analog to Digital Converters
(ADC). A ramp generator provides the reference signal for the ADC reset and pixel
measurements (Correlated Double Sampling). The
Sensor ADC Gain
register can be used to
change the slope of this reference, producing a 'digital gain'. The ADC slope setting of each
camera is calibrated at the factory to match a desired bit/e value and provide quality, high
dynamic range images.
To reload the factory calibrated value for the current camera configuration, write a value of
0x0 to the
Sensor ADC Gain
register.
It is recommended to not change this setting unless under the direction of IO Industries Inc.
support or technical staff.
IO Industries Inc.
www.ioindustries.com
Revision 2.0