Gain Control (Reference Design) - Panasonic MN34120PAJ Manual

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1.7.10 Gain Control (reference design)

When the imaging environment is dark, the level of image signal output from sensor becomes lower.
In this case, the level of image signal can be amplified by gain control.
This product has two types of gain control functions, analog gain and digital gain that can be controlled by
individual register. Please give priority to analog gain for increasing the gain.
Please refer to the "MN34120PA Register specifications" in detail.
Analog Gain
■
Analog gain can be set by "analog gain register 0x0061".
Analog gain is shown by the next expression.
Analog Gain: 0.09375 * ("analog gain register setting data" - 256) (dB)
Analog Gain variable range
Useful range of register (dec)
Digital Gain
■
Digital gain can be set by "digital gain register 0x0062".
Digital gain is shown by the next expression.
Digital Gain: 0.09375 * ("digital gain register setting data" - 320) (dB)
Digital Gain variable range
Useful range of register (dec)
-12.0dB
Analog
Register value
Digital
Figure 1.7.10 Recommended Gain Assignment (Tentative)
2015/10/01
Enactment Revision
Specifications
Gain［ dB］
47.8dB
23.9dB
Digital Gain
0dB
Analog Gain
-42dB
128
Gain
0～ 319
Gain
: -12.0 dB ～ +23.9 dB
: 128～511
: -30 dB ～ +23.9 dB
: 0～575
Total Gain
128～ 511 511
320 321～ 575
Generalplus Technology Inc.
Panasonic Semiconductor Solutions Co., Ltd.
MN34120PAJ
Total Page
Page
83
96
Register value