Analog Devices AD9843A - Manual (Page 14)

AD9843A
–14– REV. 0
Table VIII. VGA Gain Register Used for AUX2-Mode
MSB LSB
D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Gain (dB)
X 0 X X X X X X X X X 0.0
1 0 0 0 0 0 0 0 0 0 0.0
• •
• •
• •
1 1 1 1 1 1 1 1 1 1 18.0
AUX1IN
0.1 ␮F
VGA GAIN
REGISTER
ADC VGA
10
5k ⍀
0.4V
0.4V
INPUT SIGNAL
??V 0.8V
0.4V
MIDSCALE
0dB TO 36dB
Figure 14. AUX1 Circuit Configuration
0dB TO 18dB
8
AUX2IN
BUFFER
0.1 ␮F
VIDEO
SIGNAL
9
CLAMP LEVEL
LPF
VGA GAIN
REGISTER
ADC VGA
VIDEO CLAMP
CIRCUIT
CLAMP LEVEL
REGISTER
Figure 15. AUX2 Circuit Configuration
CCD
CCDIN
BUFFER
V
OUT 0.1 ␮F ADC
OUT
REGISTER
DATA
SERIAL
INTERFACE
DIGITAL
OUTPUTS
DIGITAL IMAGE
PROCESSING
ASIC
TIMING
GENERATOR
V-DRIVE
CCD
TIMING
CDS/CLAMP
TIMING
AD9843A
Figure 16. System Applications Diagram