AR0330 datasheet(44/77 Pages) ONSEMI

44 / 77 page

AR0330_DS Rev. U Pub. 4/15 EN

©Semiconductor Components Industries, LLC,2015.

AR0330: 1/3-Inch CMOS Digital Image Sensor

Gain Stages

The analog gain stages of the AR0330 sensor are shown in Figure 30. The sensor analog

gain stage consists of column amplifiers and a variable ADC reference. The sensor will

apply the same analog gain to each color channel. Digital gain can be configured to

separate levels for each color channel.

Figure 30:

Gain Stages in AR0330 Sensor

The level of analog gain applied is controlled by the coarse_gain and fine_gain registers.

The analog readout can be configured differently for each gain level. The recommended

gain tables are listed in Table 32. It is recommended that these registers are configured

before streaming images.

Table 32:

Recommended Sensor Analog Gain Tables

COARSE_GAIN

FINE_GAIN

Total Gain

COARSE_GAIN

FINE_GAIN

Total Gain

R0x3060[

5:4]

Gain

(x)

R0x3060

[3:0]

Gain

(x)

(dB)

R0x3060[

5:4]

Gain

(x)

R0x3060

[3:0]

Gain

(x)

(dB)

1.00

0.00

1.88

5.49

1.03

0.26

1.00

2.00

6.00

1.07

0.56

1.07

2.13

6.58

1.10

0.86

1.14

2.29

7.18

1.14

1.16

1.23

2.46

7.82

1.19

1.46

1.33

2.67

8.52

1.23

1.80

1.45

2.91

9.28

1.28

2.14

1.60

3.20

10.10

1.33

2.50

1.78

3.56

11.02

1.39

2.87

1.00

4.00

12.00

1.45

3.25

1.14

4.57

13.20

1.52

3.66

1.33

5.33

14.54

1.60

4.08

1.60

6.40

16.12

1.68

4.53

1.00

8.00

18.00

1.78

5.00

ADC

Reference

Digital Gain

with Dithering

Coarse Gain:

1x, 2x, 4x, 8x

Fine Gain:

1-2x: 16 steps

2-4x: 8 steps

4-8x: 4 steps

1x to 15.992x

(128 steps per 6dB)

“xxxx.Yyyy”

xxxx(15-0)

yyyyyyy( 127/128 to 0)

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