AK8817_07 Datasheet, PDF (33/43 Pages) Asahi Kasei Microsystems – NTSC/PAL Digital Video Encoder

ASAHI KASEI
(4) Vertical Sync Signal timing and Burst Phase
PAL-B,D,G,H,I
[AK8817/18]
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
Equalizing Pulse
Serration Pulse
Equalizing Pulse and Serration Pulse
300mV
+/-30mV
Symbol
G
H
G
I
Pre-equalizing pulse width
Vertical serration pulse width
Post-equalizing pulse width
Sync rise time
Measurement
point
50%
50%
50%
Value
2.35
4.7
2.35
200
* there is a case where tolerance of Sync rise time is added to Pulse width tolerance.
Recommended
tolerance
+/- 0.1
+/- 0.2
+/- 0.1
Max 300
units
usec
usec
usec
nsec
Rev.000E
33
2007 / 03