REV. 0

–10–

AD9821

REGISTER DETAILS

Table II. Operation Register Contents (Default Value x000)

Optical Black Clamp

Reset

Power-Down Modes

Channel Selection

D10

D9

D8

D7

D6

D5

D4

D3 D2

D1 D0

0

1

0

1

0

1

1

2

0

1

0

Enable Clamping

0 Normal

0

0

Normal Power

0

0 Test Only

1

Disable Clamping

1 Reset All Registers

0

1

Test Only

0

1 Test Only

to Default

1

0

Ref-Standby

1

0 Test Only

11

Total Power-Down

1

1 Imager Mode

NOTES

Table III. VGA Gain Register Contents (Default Value x000)

MSB

LSB

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

Gain (dB)

X0

0

000000000.0

••

••

••

11

11111110

35.965

11

11111111

36.0

Table IV. Clamp Level Register Contents (Default Value x080)

MSB

LSB

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

Clamp Level (LSB)

X

XX

0000

0

000

0

0000

0

001

1

0000

0

010

2

••

••

••

11111110

254

11111111

255

Table V. Control Register Contents (Default Value x000)

DATACLK Polarity

CLPOB/PBLK Polarity

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

X0

*

0

*

0

*

0 Sample on Rising Edge

0 Active Low

0

*

0

*

0

*

0

*

0

*

1 Sample on Falling Edge

1 Active High

*Must be set to 0.