JAI TM/TMC-4200CL operation manual Dynamic Range Control, Asynchronous Mode Chart, PIV Fixed Expo

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Functions and Operations

TABLE 6.	Asynchronous Mode Chart
	Async no Shutter	Async Preset and Prog. Shutter	PWC
aA	<1 line	<1 line	6 clk
aB	9.5 line	(n + 1) lines + 1024 clk	Pulse width + 1024 clk
aC			1024 clk

	PIV Fixed Expo	PIV PWC	Unit
pA	6	6
pB	200	200
pC	160	160	Pixel
pD	320	320
pE	20	20
pF	1	1	Frame

6.5 Dynamic Range Control

FIGURE 59. Output and Blooming

Blooming adj. = 13. 5 V

Lens: F=5.6

mV

Max. Digital dynamic range at 3 dB amp

600

Vsub = 8 V

CCD OUTPUT VOLTAGE

Vsub = 10 V

Vsub = 12 V

400

Vsub = 14 V

Vsub = 16 V

200

			Digital saturation at 16 dB amp					Vsub = 18 V
0		Analog saturation at 20 dB amp
0	20	40		60	80	100	120	140	160
					LUMINANCE				FL

The typical interline transfer CCD has fixed noise levels based on dark current (thermal or KT noise), pattern noise, and the operating clock speed. In general, the level of the 20 MHz pixel clock CCD at room temperature is around 20 to 50 electrons. The maximum capacity of CCD charges is limited by the well capacity at saturation. The range is limited by the structure and the pixel size.

The TM-4200CL uses a CCD with 7.4 µm x 7.4 µm pixel and two-phase vertical shift register structure. The well capacity is 40,000 electrons. The theoretical dynamic range is 40,000:30 = 1333:1 (60 dB).

TM/TMC-4200CL Series Progressive Scan Cameras