AD9805 查看數據表（PDF） - Analog Devices

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AD9805

Complete 12-Bit/10-Bit 6 MSPS CCD/CIS Signal Processors

Analog Devices 

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.

CHANGE

POINTER

WRITE TO CONFIGURATION REGISTER

SET DIGITAL GAIN RANGE TO 000

SET GAIN/OFFSET BUS SIZE TO 000

SET COLOR POINTER

AD9807/AD9805

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

following sequence.

SET PGA GAIN(S)

(INPUT OFFSET = 0mV)

SCAN DARK LINE

COMPUTE PIXEL OFFSETS

WRITE TO PGA GAIN REGISTER

SET TO GAIN OF ONE (0000)

WRITE TO INPUT OFFSET REGISTER

SET TO 0mV (11001100)

SET INPUT OFFSET

SET ODD/EVEN OFFSET

YES

SET

ANOTHER

COLOR

?

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

WRITE TO BAYER MODE REGISTER

SET MODE ON OR OFF

OPTIONAL READBACK

FROM REGISTERS

Figure 19. Initialization

YES

SET

ANOTHER

COLOR

?

NO

SET GAIN/OFFSET BUS SIZE

SET EXTERNAL PIXEL OFFSET VECTORS

SCAN WHITE LINE

COMPUTE PIXEL GAINS

YES

ADJUST

PGA GAIN(S)

?

NO

SET DIGITAL GAIN RANGE

Figure 20. Calibration

REV. 0

–19–

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