Analog Devices AD9843A, Руководство пользователя

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AD9843A
–11–
REV. 0
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
D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Gain (dB)
*
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.