ak8825 AKM Semiconductor, Inc., ak8825 Datasheet - Page 48

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

(1) Case of 525i /625i Data Input
Y/Cb/Cr multiplexed data synchronized to 27MHz clock fed into CLKIN-pin are input.
When EAV-Decoding mode, the timing signal is extracted from data stream. After extracting sync-timing, the Y/Cb/Cr data are
proceeded into Y-process block and Cb/Cr -process block. In case of H/V Slave operation mode, it is same way as EAV sync
mode.
As shown in the block diagram,
Y data proceeded by x4 over-sampling filter is added the Sync-timing signal after pass through the delay adjustment block.
Cb/Cr data proceeded by x8 over-sampling filter are processed by delay adjustment block. These data are passed to the DAC
with 54MHz Clock rate.
x4 Over-sampling Filter for Y-data (Luminance Data)
x8 Over-Sampling Filter for Cb/Cr-Data (Color Data)
Rev-E-00
Cb/Y/Cr
8-bit or 16-bit
27M Hz
-10
-20
-30
-40
-50
-60
-10
-20
-30
-40
-50
-60
10
Synchronization M ode
10
0
0
0.0
0.0 1.0
2.0
MUX
4.0
2.0
Synchronization Timing
6.0
Decoder
3.0
EA V
8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0 24.0 26.0
4.0 5.0
Frequency[MHz]
Fig. 38
Frequency[MHz]
Fig. 40
Conversion
6.0
DEM UX
Level
Input Formatter
Fig. 37 525i/625i mode Block Diagram
7.0 8.0
CBData[9:0]
CRData[9:0]
9.0 10.0 11.0 12.0 13.0
YData[9:0]
Interpolation
48
LPF-E
4:2:2
4:4:4
to
13.5M Hz
Interpolation
Interpolation
-0.200
-0.400
-0.600
-0.800
-1.000
0.200
0.000
LPF-D
LPF-F
x2
x2
0.00 0.75 1.50 2.25 3.00 3.75 4.50 5.25 6.00 6.75
27M Hz
Interpolation
Interpolation
LPF-G
LPF-H
x2
x2
Fig. 39
Frequncy[MHz]
54M Hz
Delay
Delay
Delay
SYNC Form
DAC
DAC
DAC
2008/03
[AK8825]