TLV987

3-V 10-BIT 27 MSPS AREA CCD SENSOR

SIGNAL PROCESSOR

SLAS211A – MARCH 1999 – REVISED SEPTEMBER 1999

11

POST OFFICE BOX 655303

PRINCIPLES OF OPERATION

optical black calibration register format

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

OMUX1

OMUX0

LN4

LN3

LN2

LN1

MP

PN2

PN1

PN0

optical black calibration register description

BIT

NAME

DESCRIPTION

D9, D8

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

D9 = Fine/coarse (1/0) auto-correction flag

D8 = Coarse DAC sign

D(7–0) = Coarse DAC value

1

1

D9 = Fine/coarse (1/0) auto-correction flag

D8 = Fine DAC sign

D(7–0) = Fine DAC value

D7–D4

LN4–LN0

Number of black lines for moving average = 2L

L can be 0, 1, 2, 3, 4, 5, 6, 7, and 8. Or number of lines can be 1 (default), 2 4,

8, 16, 32, 64, 128, and 256.

The maximum number of lines is 256 even if L > 8.

D3

MP

When this bit is 1, the number of 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 following numbers: 1, 2, 3 (1 x 3), 4,

6 (2 x 3), 8, 12 (4 x 3), 16, 24 (8 x 3), 32, 48 (16 x 3), 64, 96 (32 x 3), and

192 (64 x 3).

Default: MP = 0, no multiplication

D2–D0

PN2–PN0

Number of 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, and 64.

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

Default optical black calibration register value = 0000000011