CMV2000 datasheet(43/64 Pages) AMSCO

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Reference: CMV2000-datasheet-v3.8

CMV2000 v3 Datasheet

Page 42 of 63

5.15 RECOMMENDED REGISTER SETTINGS

The following table gives an overview of the registers which have a required value which is different from their default

start-up value. We strongly recommend to load these register settings after start-up and before grabbing an image.

Address

Name

Required Value

41[2:0]

Inte_sync

Exp_dual

Exp_ext

77[1:0]

Col_calib

ADC_calib

84[3:0]

I_col

85[3:0]

I_col_prech

87[3:0]

I_amp

88[6:0]

Vtf_l1

91[6:0]

Vres_low

94[6:0]

V_prech

101

95[6:0]

V_ref

106

102[1:0]

PGA

118[7:0]

Dummy

123[5:0]

V_blacksun

5.15.1 ADJUSTING REGISTERS FOR OPTIMAL PERFORMANCE

Due to processing differences, the response and optical performance may differ slightly from sensor to sensor. To adjust

this difference in response, the following registers should be tuned from sensor to sensor.

Address

Name

Default Value

Valid Range

103[7:0]

ADC_GAIN

0 - 63

98[6:0]

V_ramp1

102-115

99[6:0]

V_ramp2

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:

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

Take fully dark images with short exposure and calibrate the offset register so no pixel clips in black (< 0DN).

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.

Now take images with light and normal exposure. If the image isn’t 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.

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

To compensate gain differences between sensors, choose a fixed light setting or exposure time at which the

sensor shows a grey image about 50% of its swing (512 at 10bit). Now tweak the ADC setting per sensor so that

all sensors will have the same average grey value of about 512. This way all sensors will behave about the same

to the same amount of light.

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