ak8825 AKM Semiconductor, Inc., ak8825 Datasheet - Page 103

• Manufacturer Part Number: ak8825
• Description: Hd/sd Multi Format Video Encoder With 3ch Dac
• Manufacturer: AKM Semiconductor, Inc.

■ 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
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 AK8825 outputs RGB signal by setting YC2RGB-bit of I/O Data Format Register.
I/O Data Format Register
Sub Address 0x0B
Input Data
Rev-E-00
HDSDMASE
* AK8825 doesn’t support EAV decode Interface mode in case of RGB Data in.
YCbCr Data
RGB Data*
bit 7
Input Data
YC2RGB
bit 6
+ 1.372 * ( Cr + 128 )
analog RGB Output
YC2RGB-bit
Reserved
bit 5
1
0
DTFMT
bit 4
103
CONVMOD1
bit 3
CONVMOD0
bit 2
INPFMT1
bit 1
default Value 0x00
INPFMT0
bit 0
2008/03
[AK8825]