Instruction manual

Guppy Technical ManualV7.4.0
92
Description of the data path
In CMOS cameras offset and gain are in reversed order compared to the CCD cam-
eras. Therefore the offset is also amplified. So after changing gain, white bal-
ance may also be changed.
From the user's point of view, the white balance settings are made in register
80Ch of IIDC V1.3. This register is described in more detail on the next page.
Figure 56: Signal path of MT9V022 (Guppy F-036 with CMOS sensor)
Figure 57: Signal path of MT9P031 (Guppy F-503 with CMOS sensor)
x
Pixel output
(reset minus signal)
Offset correction
Voltage (Reg0x48 or
result of BLC)
V
REF
(Reg0x2C)
Gain Selection
(Reg0x35 or
result of AGC)
ADC Data
(9:0)
C2
C1
10 (12) bit ADC
Pixel output
Analog
offset
ADC Data
(11:0)
12-bit ADC
Analog
gain