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... the analog plus comp
a
TM
EXAR Corporation 48720 Kato Road, Fremont, CA 94538 Phone (510)-668-7000, Fax (510)-668-7030
PRELIMINARY
4
RED
GRN
BLU
VDCEXT
VREF+
DB7:0
DVDD
DGND
AVDD
AGND
ADCCLK
CLAMP
SYNCH
PGA
TIMING &
CONTROL LOGIC
AVDD
6-BIT GAIN
REGISTERS
12-BIT
ADC
RL
AGND
DATA
I/O
PORT
BUFFER
VRT
VRB
S/H
&
3-1
MUX
8-BIT DAC
12
8
8-BIT OFFSET
REGISTERS
6
8
+
_
AGND
V
DCREF
DC/AC
INT/EXT_V
DCREF
CIS/CCD
G<5:0>
O<7:0>
R G B
R G B
CLP
CLAMP
Power
Down
Power
Down
VRT
CCD
CIS
VBG
Biasing Circuit for CANON
CIS
Figure 2. Simplified Functional Block Diagram of XRD9827
OPERATIONAL PROCEDURE
The routine listed below will first calibrate the photo response of the CIS using the XRD9827 by optimize
its offset and gain. After calibration, the XRD9827REF can be used to scan any color target to show CIS
non-color corrected response. (Color correction is typically done in the digital ASIC.)