ASAHI KASEI
[AK8817/18]
(4) Vertical Sync Signal timing and Burst Phase
PAL-B,D,G,H,I
A
B
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
A
B
620
621
622
623
624
625
1
2
3
4
5
6
7
8
A
B
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
A
B
620
621
622
623
624
625
1
2
3
4
5
6
7
8
A : Phase of Burst : nominal Value + 135°
B : Phase of Burst : nominal Value - 135°
Since Burst frequency and Line frequency are not practically in integer-multiple relation, specified phase value is not
exactly 135 degrees.
Diagram below shows phase direction.
G
H
I
I
I
I
300mV
+/-30mV
Equalizing Pulse
Serration Pulse
Equalizing Pulse and Serration Pulse
Measurement
Recommended
tolerance
+/- 0.1
Symbol
Value
units
point
50%
50%
50%
G
H
G
I
Pre-equalizing pulse width
Vertical serration pulse width
Post-equalizing pulse width
Sync rise time
2.35
4.7
2.35
200
usec
usec
usec
nsec
+/- 0.2
+/- 0.1
Max 300
* there is a case where tolerance of Sync rise time is added to Pulse width tolerance.
Rev.001E
38
2009 / 12
AKM [ ASAHI KASEI MICROSYSTEMS ]
