AD9807/AD9805
P ower -O n Initialization and Calibr ation Sequence
When the AD9807/AD9805 is powered on, the following
sequence should be used to initialize the part to a known state.
T he digital gain and offset buses are disabled until the calibra-
tion sequence. T he Bayer mode register must be written to and
set to zero if this mode is not going to be used.
T o calibrate the AD9807/AD9805 for a particular scan, use the
following sequence.
SET PGA GAIN(S)
(INPUT OFFSET = 0mV)
SCAN DARK LINE
CHANGE
WRITE TO CONFIGURATION REGISTER
POINTER
SET DIGITAL GAIN RANGE TO 000
SET GAIN/OFFSET BUS SIZE TO 000
SET COLOR POINTER
COMPUTE PIXEL OFFSETS
SET INPUT OFFSET
WRITE TO PGA GAIN REGISTER
SET TO GAIN OF ONE (0000)
SET ODD/EVEN OFFSET
WRITE TO INPUT OFFSET REGISTER
SET TO 0mV (11001100)
SET
ANOTHER
YES
COLOR
?
SET
ANOTHER
YES
COLOR
?
NO
SET GAIN/OFFSET BUS SIZE
NO
WRITE TO CONFIGURATION 2 REGISTER
SET CDS OR SHA OPERATION
SET 3-CHANNEL OR 1-CHANNEL MODE
SET ADC FULL-SCALE RANGE
SET CLAMP MODE
SET EXTERNAL PIXEL OFFSET VECTORS
SCAN WHITE LINE
WRITE TO BAYER MODE REGISTER
SET MODE ON OR OFF
COMPUTE PIXEL GAINS
OPTIONAL READBACK
FROM REGISTERS
YES
ADJUST
PGA GAIN(S)
?
Figure 19. Initialization
NO
SET DIGITAL GAIN RANGE
Figure 20. Calibration
REV. 0
–19–
ADI [ ADI ]
