CS7622 datasheet(20/36 Pages) CIRRUS

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CS7622

DS322PP1

Operation Control 2

Default = 04h; Read/Write (address 05h)

Black Level Control (8 LSBs)

Default = 00h; Read/Write (address 0Bh)

Bit Number

765432

Bit Name

RESERVED

fs_lvl2

fs_lvl1

fs_lvl0

gain_cal

Default

000001

Bit

Mnemonic

Function

7:4

reserved

3:1

fs_lvl2-0

Full Scale Level: This is used to set the full scale input range of the CS7622.

Since CCDs have various saturation levels, it is advantageous to set the full

scale input range of the CS7622 to match the saturation level of the CCD used.

The table below shows the full scale level choices. (See Table 4)

0gain_cal

Gain Calibration: A calibration of the gain stages is required to insure a mono-

tonic digital output. If the user wishes to initiate a calibration, he may do so by

setting this bit to ‘1’, which will invoke a gain calibration sequence immediately.

This bit automatically clears itself after a calibration has been initiated. During

the calibration sequence the output will not contain valid data. The input clocks

must be running throughout the whole calibration sequence which lasts for

~760 clocks.

fs_lvl

Full Scale Voltage

000

0.3 V

001

0.4 V

010

0.5 V

011

0.6 V

100

0.7 V

101

0.8 V

110

0.9 V

111

1.0 V

Table 4.

Bit Number

321

Bit Name

accumulator

Default

000

Bit

Mnemonic

Function

7:0

accumulator7-0

Black Level Accumulator: See the description of register OCh.

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