AK8825 Datasheet, PDF (123/162 Pages) Asahi Kasei Microsystems – HD/SD Multi Format Video Encoder with 3ch DAC

9. High Speed Video DAC mode
■ Block Diagram
Data
HDI
VDI
Level
Converter
Delay
(+/-3clk)
DAC
HDO
VDO
[AK8825]
Fig. 171 High Speed Video DAC mode
■ Input Data Format
Input Data
RGB565
RGB666
Output
Analog RGB
Analog RGB
Operation
Digital RGB Data is converted to Analog RGB signal by DAC
Digital RGB Data is converted to Analog RGB signal by DAC
■ Full-Scale Code and Level Conversion
Input data is expanded to 10-bit, then it is converted to analog signal with DAC.
Full-Scale code is shown as following table.
RGB565
RGB666
R=0x3E0
R=0x3F0
Full-Scale Code
G=0x3F0
G=0x3F0
B=0x3E0
B=0x3F0
The DAC output Level at Full-Scale Code can be set with OLVL-bit of DAC Control Register [SubAddress 0x0D].
DAC Control Register
Sub Address 0x0D
bit 7
bit 6
Reserved
Reserved
bit 5
OLVL
bit 4
DTRSTN
bit 3
CVBSSEL
bit 2
DAC3EN
default Value 0x00
bit 1
bit 0
DAC2EN
DAC1EN
OLVL-ibit
0
1
Output Level [V]
1.28V (typ)
0.7V (typ)
Rev-E-00
123
2008/03