ak8825 AKM Semiconductor, Inc., ak8825 Datasheet - Page 117

• Manufacturer Part Number: ak8825
• Description: Hd/sd Multi Format Video Encoder With 3ch Dac
• Manufacturer: AKM Semiconductor, Inc.

(1-2-1) Vertical SYNC Signal Timing (NTSC/NTSC4.43)
* There is a case with V-Blank of 20 Lines. This value is pre-settable by register.
Rev-E-00
Symbol
G
G
H
I
2 6 3
Symbol
Equalizing Pulse
Vertical
equalizing pulse
Vertical blanking
(63.556usec x 20lines + 1.5usec)
Pre-equalizing pulse width
Post-equalizing pulse width
Field Period (derived)
Frame period (derived)
Pre-equalizing duration
Vertical sync duration
Vertical serration pulse width
Post-equalizing duration
Sync rise time
A
B
C
D
E
F
1
2 6 4
I
C
G
A
blanking
B
2
3 H
3 H
2 6 5
Duration
I
429T
858T
429T
858T
31T
63T
0 .5 H
0 .5 H
start
3
2 6 6
Fig. 165 Equalizing Pulse and Serration Pulse
before
4
2 6 7
D
first
Measurement point
3 H
3 H
E
5
(レ ジ ス タ に て 設 定 )
2 6 8
Measurement
1 9 + 1 /- 2 L in e
50%
Fig. 164
point
F
50%
50%
50%
50%
117
6
2 6 9
7
2 7 0
19* lines + 1.5
16.6833
33.3667
3 H
3 H
Value
13.5MHz Clock
usec
140
1.5
2.3
4.7
2.3
8
I
3
3
3
Reference
Serration Pulse
2 7 1
H
9
2 7 2
Recommended
I
tolerance
+/- 0.1
+/- 0.1
+/- 0.1
+/- 0.1
+/- 0.1
+/- 20
2 7 3
0
1 9
286mV
2008/03
[AK8825]
msec
msec
units
usec
usec
usec
usec
usec
nsec
lines
lines
lines
lines
2 8 3