ADV8003 Hardware Manual
Rev. B, August 2013
312
dac5_sel[2:0]
, Encoder Map,
Address 0xE429[2:0]
This signal selects the data that is supplied to DAC 2.
Function
dac5_sel[2:0]
Description
0
CVBS or Black Burst
1
Luma
2
Chroma
3
Y/G
4
Pb/B
5
Pr/R
6
Core Bypass DAC DFT
7
DDS Eval DFT
dac6_sel[2:0]
, Encoder Map,
Address 0xE42A[6:4]
This signal selects the data that is supplied to DAC 3.
Function
dac6_sel[2:0]
Description
0
CVBS or Black Burst
1
Luma
2
Chroma
3
Y/G
4
Pb/B
5
Pr/R
6
Core Bypass DAC DFT
7
DDS Eval DFT
8.4.
ADDITIONAL DESIGN FEATURES
This section outlines the various design features of the encoder which can be used to improve the overall video quality and the ADV8003
performance in a system. Many of these functions are optional and should be set depending on a user’s application.
8.4.1.
Output Oversampling
The ADV8003 encoder core includes two on-chip phase-locked loops (PLLs) that allow for oversampling of SD, ED, and HD video data.
Oversampling effectively increases the bandwidth of the output video data, which means that expensive analog filters are not needed at
the DAC outputs, thus resulting in reduced BOM costs.
shows the various oversampling rates supported in the ADV8003
encoder core.
Two PLLs are used for oversampling the analog output video, depending on the mode. When SD modes only are being output, PLL1 is
used for output oversampling. When HD modes only are being output, PLL2 is used for output oversampling. In dual modes where both
SD and HD formats are being output, PLL1 and PLL2 are both used for SD and HD video respectively.
pll_pdn
, Encoder Map,
Address 0xE400[1]
This bit is used to control the PLL and oversampling. This control allows the internal PLL 1 circuit to be powered down and the
oversampling feature to be switched off. By default this is disabled, setting this bit to 0 enables this feature.
Содержание ADV8003
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