Analog Devices AD9843A manual Must be set to zero. **Set to one

AD9843A

Table II. Operation Register Contents (Default Value x000)

						Optical Black Clamp			Reset			Power-Down Modes				Channel Selection
D10	D9	D8	D7		D6	D5			D4			D3	D2			D1	D0
0*	0*	0*	1**		0*	0	Enable Clamping		0	Normal		0	0	Normal Power		0	0	CCD-Mode
						1	Disable Clamping		1	Reset All		0	1	Fast Recovery		0	1	AUX1-Mode
										Registers		1	0	Standby		1	0	AUX2-Mode
										to Default		1	1	Total Power-Down		1	1	Test Only
*Must be set to zero. **Set to one.
					Table III. VGA Gain Register Contents (Default Value x096)
	MSB														LSB
D10	D9	D8		D7		D6	D5	D4		D3		D2		D1	D0			Gain (dB)
X	0	0	0			1	0	1		1		1		1	1			2.0
								•										•
								•										•
								•										•
	1	1	1			1	1	1		1		1		1	0			35.965
	1	1	1			1	1	1		1		1		1	1			36.0
					Table IV. Clamp Level Register Contents (Default Value x080)
				MSB											LSB
D10	D9	D8		D7		D6	D5	D4		D3	D2			D1	D0	Clamp Level (LSB)
X	X	X		0		0	0	0		0	0			0	0	0
				0		0	0	0		0	0			0	1	0.25
				0		0	0	0		0	0			1	0	0.5
								•								•
								•								•
								•								•
				1		1	1	1		1	1			1	0	63.5
				1		1	1	1		1	1			1	1	63.75

Table V. Control Register Contents (Default Value x000)

	Data Out			DATACLK	CLP/PBLK	SHP/SHD	CDS Gain
D10	D9	D8	D7	D6	D5	D4	D3	D2	D1	D0

X	0 Enable		0* 0*	0 Rising Edge Trigger			0 Active Low	0 Active Low		0 Disabled**	0* 0* 0*
	1 Three-State			1 Falling Edge Trigger			1 Active High	1 Active High		1 Enabled
*Must be set to zero.
**When D3 = 0 (CDS Gain Disabled), the CDS Gain Register is fixed at 4 dB (Code 63 dec).
				Table VI. CDS Gain Register Contents (Default Value x000)
					MSB					LSB	Gain (dB) *
D10	D9	D8	D7	D6	D5	D4	D3	D2	D1	D0
X	X	X	X	X	0	0	0	0	0	0	+4.3
							•				•
							•				•
							•				•
					0	1	1	1	1	0	+10.0
					1	0	0	0	0	0	–2.0
							•				•
							•				•
							•				•
					1	1	1	1	1	1	+4.0

*Control Register Bit D3 must be set high for the CDS Gain Register to be used.

REV. 0 –11–