AD9840 データシートの表示（PDF） - Analog Devices
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AD9840 Datasheet PDF : 16 Pages
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AD9840A
Table II. Operation Register Contents (Default Value x000)
Optical Black Clamp Reset
D10 D9 D8 D7 D6 D5
D4
Power-Down Modes
D3 D2
Channel Selection
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
D10 D9
D8
X
0
0
1
1
1
1
LSB
D7
D6
D5
D4
D3
D2
D1
D0
Gain (dB)
0
1
0
1
1
1
1
1
2.0
•
•
•
•
•
•
1
1
1
1
1
1
1
0
35.965
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
X
X
X
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
•
•
•
1
1
1
1
1
1
1
0
1
1
1
1
1
1
1
1
Clamp Level (LSB)
0
0.25
0.5
•
•
•
63.5
63.75
Table V. Control Register Contents (Default Value x000)
Data Out
D10 D9
D8 D7
DATACLK
D6
CLP/PBLK
D5
SHP/SHD
D4
CDS Gain
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)
D10 D9
D8
MSB
LSB
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.
–10–
REV. 0
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