SN28835

1/2-INCH NTSC TIMER

SOCS023B – FEBRUARY 1991

11

POST OFFICE BOX 655303

PARAMETER MEASUREMENT INFORMATION

ABIN Timing at the Start of H

Horizontal

Scale†

CBLK

BCP1

ABIN

VD

ABIN Timing at the Start of V

1 MHz (always free running)

(130)

26

24

22

20

18

16

14

12

10

8

6

4

2

0

128

126

124

ABIN

(mode 0)

ABIN

(mode 1)

ABIN

(mode 2)

ABIN

(mode 3)

(modes 1

or 2)

† 130 intervals equal 63.55

µs equals one horizontal-scan line

NOTE: GPS is high (VD is connected to GP internally)

ANTIBLOOMING-MODE SELECTION

MODE‡

ABS1

ABS0

ABIN

0

L

L

Low

1

L

H

2-MHz burst

2

H

L

1-MHz burst

3

H

H

1-MHz free running

‡ In mode 2, the duty cycle is 43%; in all other modes, the duty cycle

is 50%.

Figure 7. Antiblooming Timing at Start of Horizontal Transfer