AR0141CS datasheet(18/64 Pages) ONSEMI

18 / 64 page

AR0141CS/D Rev. 6, 4/16 EN

©Semiconductor Components Industries, LLC, 2016.

AR0141CS: 1/4-Inch Digital Image Sensor

Gain Stages

The sensor analog gain stage will apply the same analog gain to each color channel.

Digital gain can be configured to separate levels for each color channel.

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

R0x3060 analog gain register. The analog readout circuitry can be configured differently

for each analog gain level. Total analog gain is (2coarse_gain) x(1+fine_gain/16), where

coarse_gain = R0x3060[6:4], fine_gain = R0x3060[3:0]. ON Semiconductor recommends

limiting maximum analog gain up to 12x gain for optimal image quality.

Each digital gain can be configured from a gain of 0 to 15.992 using R0x3056, R0x3058,

R0x305A, R0x305C, and R0x305E digital gain registers. The digital gain supports 128 gain

steps per 6dB of gain. The format of each digital gain register is “xxxx.yyyyyyy” where

“xxxx” refers an integer gain of 1 to 15 and “yyyyyyy” is a fractional gain ranging from 0/

128 to 127/128.

The sensor includes a digital dithering feature to reduce quantization noise resulting

from using digital gain. It can be implemented by setting R0x30BA[5] to 1. The default

value is 0.

AR0141CS Datasheet(PDF) 18 Page - ON Semiconductor