AK8826VN Datasheet, PDF (108/157 Pages) Asahi Kasei Microsystems – HD/SD Multi Format Video Encoder with 3ch DAC

■ Color Burst Signal (SDTV)
[AK8826VN]
Color burst signal is generated by 32bits-length Digital Frequency Synthesizer. Subcarrier Frequency of Color-Burst is set by
SDVM0-SDVM1 -bits of SD Block Control Register (R/W) [Sub Address 0x11].
SD Block Control Register
Sub Address 0x11
bit 7
bit 6
SDBBG
SDCBG
bit 5
SDSETUP
bit 4
SCR
bit 3
SDVM3
bit 2
SDVM2
Default Value 0x10
bit 1
bit 0
SDVM1
SDVM0
Standard
NTSC-M
PAL-M
PAL-B,D,G,H,I
PAL-N(Arg)
PAL-N(non-Arg)
PAL60
NTSC-4.43
Subcarrier Freq
(MHz)
3.57954545
3.57561188
4.43361875
3.5820558
4.43361875
4.43361875
4.43361875
Burst Table
Video Process 1
[SDVM1,SDVM0]
[0,0]
[0,1]
[1,1]
[1,0]
[1,1]
[1,1]
[1,1]
Sub-carrier frequency 3.57561188MHz is allowed when PAL-M mode is selected.
Sub Carrier Frequency and Sub Carrier Phase are set by Sub Carrier Frequency Control Register (R/W) [Sub Address
0x16] Sub Carrier Phase Control Register (R/W) [Sub Address 0x17].
The burst frequency and initial phase resolution are as follows.
Frequency resolution
SCH Phase resolution
0.8046Hz
360°/256
MS0972-E-01
108
2008/12