3.4.4

Analog and digital gains

The VD66GY enables to adjust analog and digital gains on the image to optimize image quality depending on the

lighting conditions. Gains are adjusted automatically when autoexposure is enabled, or by manual control when

autoexposure is disabled.

Analog gain ranges from x1 (+ 0 dB) up to x8 (+18 dB) with 29 steps following a 1/X behavior enabling to benefit

from fine gain granularity at low gain and wider granularity at high gains to better adjust image quality. It follows

the following formula:

Analoggainx = 3232−x

Where x is an integer from 0 to 28.

Figure 4. Analog gain progression versus control code

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

16

AGAIN progression15

0

5

10

15

20

25

30

0

1

2

3

4

5

7

8

9

10

11

12

13

14

15

16

17

18

0

4

8

12

16

20

24

28

AGAIN control code

decibel (dB)

linear

Four digital gains (one per color channel) can be applied, each of them ranging from 1.0 up to 8.0 minus one step

control with a step control of 1/256th so approximately 0.0039.

VD66GY

Functional description

DS13838 - Rev 7

page 8/37