Analog Gain; Table 8-1: Typical Electron Counts Vs. Analog Gain Setting - Teledyne Princeton Instruments Sophia-XO System Manual

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8.3

Analog Gain

Controller gain, a configurable function of the preamplifier, changes the relationship
between the number of electrons acquired on the CCD and the Analog-to-Digital Units
(ADUs) generated. The level of gain is configured by the Analog Gain parameter on the
Analog to Digital Conversion expander.
Supported Analog Gain options are:
•
•
•
Table 8-1
supported Analog Gain setting.
Table 8-1:
®
SOPHIA -XO System Manual
Low
This gain setting is best suited for binning applications, particularly when
high-level signals are being digitized. Although this setting may be used with
non-binned modes, the CCD single pixel well typically will not reach ADC
saturation when applying Low gain.
Medium
This gain setting is typically selected for experiments within the mid-level
intensity range.
High.
Applications that consistently measure low-level signals should select this gain
setting since it requires fewer electrons to generate each ADU. Additionally, this
setting can reduce some sources of noise.
provides typical electron counts required to generate an ADU for each
NOTE:
The Certificate of Performance included with SOPHIA-XO
specifies the measured gain values for various Analog Gain
settings.
Actual electron counts required are also dependent upon
the configured readout rate.
Typical Electron Counts vs. Analog Gain Setting
Low Medium
-
5 e /count 1.7 e
High
- -
/count 0.7 e /count
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