SN28837

1/2-INCH PAL TIMER

SOCS031B – JULY 1991

13

POST OFFICE BOX 655303

2T1

H Counter(T1)

206 208 210

0

2

4

6

8

10

1214

16

18

2022

2426

28

30

32

34

36

38

40

42

44

Mode 1

2-MHz Burst

212

CBLK

BCP1

BCP1

Mode 2

1-MHz Burst

Mode 3

Mode 4

VD

INTGO

ABCLR

(mode 1, mode 2)

V Timing

ABIN

ABIN

(mode 1, mode 2)

H Timing

T1 = 299 ns

1 MHz (0.9554 MHz)

2 MHz (1.9107 MHz)

Always Free Running

ANTIBLOOMING MODE SELECTION

MODE

ABS0

ABS1

ABS2

ABIN OUTPUT

0

X

0

0

No ABG

1

X

1

0

2 MHz burst

2

X

0

1

1 MHz burst

3

1

1

1

1 MHz const

4

0

1

1

2 MHz const

X = Don’t care

NOTES: A. For mode 1 and mode 4, duty cycle is 4/7 high and 3/7 low.

B. Only the timing from odd field to even field is shown. The timing from even field to odd field is the same as that for odd field to even

field minus the H-to-V timing.

C. GPS is always high.

Figure 9. ABIN Timing