TLV990

3-V, 10-BIT, 28-MSPS AREA CCD AND VIDEO SIGNAL PROCESSOR

SLVS298 – MAY 2000

13

POST OFFICE BOX 655303

REGISTER DEFINITION

optical black setup register format

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

OMUX1

OMUX0

X

X

SOFW1

SOFW0

MP

PN2

PN1

PN0

optical black setup register description

BIT

NAME

DESCRIPTION

D8, D9

OMUX1,

OMUX0

These two bits multiplex digital output (data presented at D[9:0] pins):

OMUX1

OMUX0

0

0

D[9:0] = ADC output (default)

0

1

D[9:0] = ADC output

1

0

D[9] = fine/coarse (1/0) autocorrection flag

D[8] = coarse DAC sign

D[7:0] = coarse DAC value

1

1

D[9] = fine/coarse (1/0) autocorrection flag

D[8] = fine DAC sign

D[7:0] = fine DAC value

D7, D6

X

Reserved

D5, D4

SOFW1,

SOFW0

These two bits set the digital filter weight when SOF is activated (the SOF bit in control register 2 is set to 1).

SOFW1

SOFW0

Weight

0

0

0

(default)

0

1

1

1

0

2

1

1

3

D3

MP

When this bit is 1, the number of optical black pixels to be averaged per line (2N) is multiplied by 3.

By setting the MP and PN2–PN0 bits together, the number of optical black pixels can be programmed to have the follow-

ing numbers:

1, 2, 3 (1X3), 4, 6 (2

×3), 8, 12 (4×3), 16, 24 (8×3), 32, 48 (16×3), 64, 96 (32×3), and 192 (64×3).

Default: MP = 0, no multiplication

D2–D0

PN2–PN0

Number of optical black pixels per line to average = 2N

N can be 0, 1, 2, 3, 4, 5, and 6. Or number of pixels per line can be 1, 2, 4, 8 (default), 16, 32, or 64.

The maximum number of pixels per line is 64, even if N>6.

Default optical black calibration register value = 0000000011