ak8823 AKM Semiconductor, Inc., ak8823 Datasheet - Page 43

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

ASAHI KASEI
15-5. Set-Up Process Function ( HD )
In the AK8823, a 7.5 % set-up can be added by [ Mode Register ] setting.
Set-Up process is done in the following manner.
Luminance Signal = 700 [ mV ] x 7.5 % + ( Luminance signal without set-up ) x 0.925
Chroma Signal
15-6. On chip out-put Video Limiter ( HD, SD Modes )
Limiter function is performed on signals which exceed Pedestal Level.
Limiter Levels are set at 0 IRE ( no limiter ), - 1.5 IRE and - 7 IRE.
These levels can be independently controlled for HD and SD Blocks.
15-7. Black Burst Signal Generator Function ( HD )
The AK8823 can output Black Burst Signal ( Black Level Output ).
When BB-bit of [ Mode Register ] is set to “ 1 “, same operation is processed as in the case when the fixed-16 Luminance signal
and the fixed-128 Cb / Cr signal outputs are input.
In this case, when set-up bit is “ ON “, set-up process is done and when it is “ OFF “, no set-up process is made.
15-8. Color Bar Signal Generator Function ( HD )
The AK8823 can output Color Bar Signal in all output modes.
Color Bar Signal is output by setting CB-bit of [ Mode Register ] to “ 1 “.
In this case, when set-up bit is “ ON “, set-up process is done and when it is “ OFF “, no set-up process is made.
When to output Color Bar Signal, required timing is automatically generated internally.
Namely, it is no need to input SYNC timing from outside of the chip.
MS0549-E-02
(default)
HDY
HDY
SYNC Signal and HDY Signal relation
= ( Cb/Cr signals without set-up ) x 0.925
3clk 3clk
260T @ 60Hz / 50Hz
In 720p @ 60 Hz / 50 Hz Input Mode
43
HDPb/HDPr
HDY
HDY Signal and HDPb / HDPr Signal relation
T : 74.25 MHz
3clk 3clk
2006/10
[AK8823]