AK8826 Datasheet, PDF (81/157 Pages) Asahi Kasei Microsystems – HD/SD Multi Format Video Encoder with 3ch DAC

[AK8826VN]
(1) 525i waveform (EIA-770.2-C)
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[Sync waveform level]
Only 525i output mode, AK8826 can output both of 286mV sync-waveform and 300mV sync-waveform with setting
HDVRATIO-bit of HD Block Control Register [SubAddress0x07]
HD Block Control Register
Sub Address 0x07
bit 7
bit 6
HDWSS
HDCFLT1
bit 5
HDCFLT0
bit 4
HDYFLT1
bit 3
HDYFLT0
bit 2
Reserved
default Value 0x00
bit 1
bit 0
COLSNCEN HDVRATIO
HDVRATIO-bit
0
1
Sync waveform Level
300mV (EIA770.2-A)
286mV (EIA770.1-A)
(1-1) 525i Sync waveform
90%
H o riz o n ta l B la n k in g ris e tim e
50%
10%
S yn c ris e tim e
H o rizo n ta l
re fe re n c e p o in t
90%
50%
10%
H b la n k in g s ta rt
to H -reference
50%
300m V*
S ync
H re fe re n c e to B la n k in g E n d
Fig. 120
Total line period(derived)
Sync rise time
Horizontal Sync
measurement
point
10% - 90%
50%
value
63.556
140
4.7
Recommended
tolerance
+/- 20
+/- 0.1
Design Spec (T=1/13.5MHz)
H-Blanking start to H-reference
H reference to H-blanking end
Measurement Point
50%
50%
Reference Clock
16T
122T
* 286mV sync waveform can be output by register setting.
units
usec
nsec
usec
MS0972-E-01
81
2008/12