CMV2000 datasheet(76/87 Pages) AMSOSRAM

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CMV2000

Datasheet

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Table 36: Optical performance registers for version 2

Address

Name

Required value

Valid range

103[7:0]

ADC_GAIN

40 - 55

98[6:0]

V_ramp1

102 - 115

99[6:0]

V_ramp2

102 - 115

100[7:0]

Offset

16323

0 - 16383

Table 37: Optical performance registers for version 3

Address

Name

Required value

Valid range

103[7:0]

ADC_GAIN

See Gain chapter

0 - 63

98[6:0]

V_ramp1

109

102 - 115

99[6:0]

V_ramp2

109

102 - 115

100[7:0]

101[5:0]

Offset

16323

0 - 16383

To optimize the sensor response and minimize noise, the following procedure should be

followed for each sensor:

1. Start by programming all registers with the recommended values from the datasheet.

2. Take fully dark images with short exposure and calibrate the offset register so no pixel clips

in black (< 0DN).

3. When column non-uniformities are observed in the dark image, a calibration of the

V_ramp1 and V_ramp2 registers is necessary. These registers set the starting voltage of

the ramp used by the column ramp ADC, so adjusting this value will improve column CDS

(correlated double sampling) which will reduce the column FPN. Both values should be

adjusted together and should always have the same value.

4. Now take images with light and normal exposure. If the image is not saturated, increase the

light or the exposure time until all pixels reach a constant value. If not all pixels saturate at

1023 (meaning that the non-linear part of the pixel voltage is in the ADC input range),

increase the ADC gain/range setting until they do. The PGA amplifier can also be used at

this stage.

5. The dark offset level may have shifted when doing ADC calibration, so repeat step 2.

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