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AD9807/AD9805

–19–

REV. 0

To calibrate the AD9807/AD9805 for a particular scan, use the

following sequence.

SET DIGITAL GAIN RANGE

YES

SET PGA GAIN(S)

(INPUT OFFSET = 0mV)

SCAN DARK LINE

COMPUTE PIXEL OFFSETS

SET INPUT OFFSET

SET ODD/EVEN OFFSET

SET GAIN/OFFSET BUS SIZE

SET EXTERNAL PIXEL OFFSET VECTORS

SCAN WHITE LINE

ADJUST

PGA GAIN(S)

COMPUTE PIXEL GAINS

SET

ANOTHER

COLOR

YES

Figure 20. Calibration

Power-On Initialization and Calibration Sequence

When the AD9807/AD9805 is powered on, the following

sequence should be used to initialize the part to a known state.

The digital gain and offset buses are disabled until the calibra-

tion sequence. The Bayer mode register must be written to and

set to zero if this mode is not going to be used.

WRITE TO CONFIGURATION REGISTER

SET DIGITAL GAIN RANGE TO 000

SET GAIN/OFFSET BUS SIZE TO 000

SET COLOR POINTER

OPTIONAL READBACK

FROM REGISTERS

WRITE TO PGA GAIN REGISTER

SET TO GAIN OF ONE (0000)

WRITE TO INPUT OFFSET REGISTER

SET TO 0mV (11001100)

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

WRITE TO BAYER MODE REGISTER

SET MODE ON OR OFF

YES

CHANGE

POINTER

SET

ANOTHER

COLOR

Figure 19. Initialization

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