Bit Allocation Of The Output Video; Functions And Operation; Basic Functions - JAI LQ-201CL User Manual

5.3.5

Bit allocation of the output video

Digital
CMOS out 8-Bit
(LSB)
Black 8
200mV 222
230mV 255
6.

Functions and Operation

6.1.

Basic functions

300
Dichroic
Prism
300
Light
Color
Separation
300
300
The LQ-201CL uses four high-performance CMOS line scan image sensors mounted on a prism block.
During exposure, the incoming light is converted to electrons (electric charge) in the photodiodes
(active pixels). The transfer gate controls the transfer of charge from photodiodes to the shift
register. Activating the transfer gate terminates the exposure cycle, transfers the charge to the
Horizontal Shift Register (2-phase buried channel CMOS shift register) and starts a new exposure
cycle. The line is subsequently read out in a single sequence starting with pixel 1.
The exposure time is normally the same as the cycle time (in No-shutter mode). By using the
Exposure Control Gate (in Shutter-Select or Pulse Width Control trigger modes) the exposure time
can be individually set to be shorter than the cycle time (the inverse of line rate). This also allows a
fixed exposure time, independent of the line rate. In the LQ-201CL the exposure time can be set
individually for all four channels.
Digital
10-Bit
(LSB)
32
890
1023
AMP
ADC
400 500 600 700 800 900 1000
AMP
ADC
400 500 600 700 800 900 1000
AMP
ADC
400 500 600 700 800 900 1000
AMP
ADC
400 500 600 700 800 900 1000
Fig.9
LQ-201CL
2000
1740
32
0
CCD_out( m V)
Fig.8
Auto black, DSNU, PRNU, Shading,
Fine Gain, Line Matrix, Knee, Noise
reduction, User black
Auto black, DSNU, PRNU, Shading,
Fine Gain, Line Matrix, Knee, Noise
reduction, User black
Auto black, DSNU, PRNU, Shading,
Fine Gain, Line Matrix, Knee, Noise
reduction, User black
Auto black, DSNU, PRNU, Shading,
Fine Gain, Line Matrix, Knee, Noise
reduction, User black
Signals flow
14
8-bit /10-bit
255/1023
222/ 890
8/32
0
230
200
Video output
OUT
PUT