ak8825 AKM Semiconductor, Inc., ak8825 Datasheet - Page 116

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

■ SYNC Signal Waveform, Burst Waveform (SD)
(1-1) NTSC / NTSC-4.43 / PAL-M( SD Block Control Register [SDVM3:SDVM2]-bit = 00 / 01 の場合 ) （ SMPTE-170M ）
* measurement of Burst Timing Length is made between the Burst Start Point which is defined as the zero-cross point,
preceding the first-half cycle of the sub-carrier where Burst Amplitude becomes higher than 50 % level and the Burst End Point,
defined in the same manner.
Burst Time Length ( period ) is 10 cycles in NTSC-4.43 mode.
** Burst Height of PAL-M mode is 306 mV.
Rev-E-00
Total line period(derived)
Sync Level
Horizontal Blanking rise time
Sync rise time
Burst envelope rise time
H-Blanking start to H-reference
Horizontal Sync
Horizontal reference point to
burst start
H reference to H-blanking end
Burst *
Burst Height **
H o r iz o n ta l
r e f e r e n c e p o in t
9 0 %
5 0 %
1 0 %
H b la n k in g s ta r t
t o H - r e f e r e n c e
H o r iz o n ta l B la n k in g r is e t im e
9 0 %
5 0 %
50%
1 0 %
measurement
S y n c r is e t im e
10% - 90%
10% - 90%
10% - 90%
19 cycles +/-10°
H . r e f . t o B u r s t S ta r t
point
50%
50%
50%
50%
50%
S y n c
Fig. 163 NTSC Color Burst
H r e f e r e n c e to B la n k in g E n d
5 0 %
5 0 %
Fig. 162
116
63.556
value
140
140
300
1.5
4.7
9.2
9 cycles
40
19
40
9
1 0 %
S y n c L e v e l
B u r s t E n v e lo p e
r is e t im e
9 0 %
B u r s t
B u r s t H e ig h t
defined by SC/H
Recommended
+200 -100
+ 0.2 - 0.1
tolerance
+/- 0.1
+/- 0.1
+/- 20
+/- 20
+/- 1
+/- 1
+/- 1
5 0 %
cycles
cycles
units
usec
nsec
nsec
nsec
usec
usec
usec
IRE
IRE
2008/03
[AK8825]