AK8826 Datasheet, PDF (99/157 Pages) Asahi Kasei Microsystems – HD/SD Multi Format Video Encoder with 3ch DAC

[AK8826VN]
■ Analog RGB Signal Output
RGB conversion ( 601 Color Space and always Sync-On-Green(SOG) ) is possible only with 525i / 625i or SDTV input.
Conversion Factors
R=Y
+ 1.372 * ( Cr + 128 )
G = Y + 0.336 * ( Cb + 128 ) + 0.698 * ( Cr + 128 )
B = Y + 1.732 * ( Cb + 128 )
RGB signals are output at the same timing as in YPbPr conversion and their levels are RGB Matrix results.
A similar SYNC signal is carried out on G signal.
The AK8826 outputs RGB signal by setting YC2RGB-bit of I/O Data Format Register.
I/O Data Format Register
Sub Address 0x0B
bit 7
bit 6
HDSDMASE YC2RGB
bit 5
Reserved
bit 4
DTFMT
bit 3
bit 2
CONVMOD1 CONVMOD0
default Value 0x00
bit 1
bit 0
INPFMT1
INPFMT0
Input Data
Input Data
analog RGB Output
YC2RGB-bit
YCbCr Data
1
RGB Data*
0
* AK8826 doesn’t support EAV decode Interface mode in case of RGB Data in.
MS0972-E-01
99
2008/12