AK8825 Datasheet, PDF (116/162 Pages) Asahi Kasei Microsystems – HD/SD Multi Format Video Encoder with 3ch DAC

■ SYNC Signal Waveform, Burst Waveform (SD)
[AK8825]
(1-1) NTSC / NTSC-4.43 / PAL-M(SD Block Control Register [SDVM3:SDVM2]-bit = 00 / 01 の場合)（SMPTE-170M ）
H o riz o n ta l B la n k in g ris e tim e
90%
50%
B u rst E n ve lo p e
ris e tim e
10%
H o rizo n ta l
re fe re n c e p o in t
S yn c ris e tim e
90%
50%
10%
90%
10%
B u rs t H e ig h t
50%
B urst
Sync Level
S ync
H b la n k in g s ta rt
to H -reference
H . re f. to B u rs t Sta rt
H re fe re n c e to B la n k in g E n d
50%
Fig. 162
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 **
measurement
point
10% - 90%
10% - 90%
10% - 90%
50%
50%
50%
50%
50%
value
63.556
40
140
140
300
1.5
4.7
19
9.2
9
40
Recommended
tolerance
+/- 1
+/- 20
+/- 20
+200 -100
+/- 0.1
+/- 0.1
defined by SC/H
+ 0.2 - 0.1
+/- 1
+/- 1
units
usec
IRE
nsec
nsec
nsec
usec
usec
cycles
usec
cycles
IRE
* 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.
19 cycles +/-10°
9 cycles
Rev-E-00
50%
Fig. 163 NTSC Color Burst
116
2008/03