ak8823 AKM Semiconductor, Inc., ak8823 Datasheet - Page 47

• Manufacturer Part Number: ak8823
• Description: Hdtv & Ntsc/pal Multi-format Encoder Sdtv/hdtv X2 Oversampling 5ch Dacs
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
16. SD Block
16-1. Color Burst Signal ( SD )
Color Burst signal is generated by a 32-Bit Digital Frequency Synthesizer.
Color Burst Sub-carrier frequency is set by VM0 ~ VM1 bits of { Video Process 1 Register ( 0x11 )}.
Sub-carrier frequency of 3.57561188 MHz is supported in PAL-M mode only.
Burst Frequency and Initial Phase Resolutions are as follows.
16-2. Closed Caption(SD)
The AK8823 has encoding functions of the Closed Captioning and Extended Data.
ON / OFF control of these functions is in accordance with { Video Process 2 Register ( 12H ) } setting.
Each Data occupies a consecutive 2 Byte Register area { Closed Caption R ( 26H, 27H )}.
Data is written at 26H first, then 27H in this order.
Data is judged to be updated when data at 27H is written.
When data is updated, it is encoded on a coming thereafter, pre-scribed Line.
When no data updating is made, ASCII Null code is output.
Each data is assumed with ODD parity + 7 bit US ASCII code. Parity is processed at the Host side.
MS0549-E-02
50 +/- 2 IRE
40IRE
* In PAL Encoding mode, output is also made in the same timing & format as in NTSC mode.
* Closed Caption Data is encoded on the following Lines.
Pre-settable Frequency Resolution
SCH Phase Resolution
Closed Caption
Extended Data
spec
NTSC-M
PAL-M
PAL-B,D,G,H,I
PAL-N(Arg)
PAL-N(non-Arg)
PAL60
NTSC-4.43
10.003 +/- 0.25usec
10.5 +/- 0.25usec
525/60 System (SMPTE)
284 Line default
21 Line default
Burst Signal Table
Subcarrier Freq
3.57954545
3.57561188
4.43361875
3.5820558
4.43361875
4.43361875
4.43361875
27.382 usec
(MHz)
12.91 usec
0.8046 Hz
360 / 256 degrees
47
Video Process 1
625/50 System (ITU-R)
[VM1,VM0]
61 usec
335 Line default
240+/- 48nsec
22 Line default
[0,0]
[0,1]
[1,1]
[1,0]
[1,1]
[1,1]
[1,1]
Two 7-bit + PARITY ASCII
D0-D6
Characters Data
33.764 usec
D0-D6
240+/- 48nsec
2006/10
[AK8823]