參數資料
| 型號： | ADV7188BSTZ |
| 廠商： | Analog Devices Inc |
| 文件頁數： | 22/112頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DECODER VID MULTIFORM 80LQFP |
| 標準包裝： | 1 |
| 類型： | 視頻解碼器 |
| 應用： | 機頂盒，視頻播放器，錄音機 |
| 電壓 - 電源，模擬： | 3.15 V ~ 3.45 V |
| 電壓 - 電源，數字： | 1.65 V ~ 2 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 80-LQFP |
| 供應商設備封裝： | 80-LQFP（14x14） |
| 包裝： | 托盤 |
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ADV7188
Rev. A | Page 17 of 112
MAN_ALPHA_VAL [6:0]. Overlay is not possible in fixed
alpha blending mode.
Dynamic Switching (Fast Mux). The FB pin can be used to
select the source. This enables dynamic multiplexing between
the CVBS and RGB sources. With default settings, when
Logic 1 is applied to the FB pin, the RGB source is selected;
when Logic 0 is applied to the FB pin, the CVBS source is
selected. This mode is suitable for the overlay of subtitles,
teletext, or other material. Typically, the CVBS source
carries the main picture, and the RGB source has the
overlay data.
Dynamic Switching with Edge Enhancement. This provides
the same functionality as the dynamic switching mode,
but with the benefit of Analog Devices’ proprietary edge-
enhancement algorithms, which improve the visual appearance
of transitions for signals from a wide variety of sources.
System Diagram
A block diagram of the ADV7188 fast blanking configuration is
shown in Figure 9.
The CVBS signal is processed by the ADV7188 and converted
to YPrPb. The RGB signals are processed by a color space
converter (CSC), and samples are converted to YPrPb. Both sets
of YPrPb signals are input to the subpixel blender, which can be
configured to operate in any of the four modes previously
outlined in this section.
The fast blank position resolver determines the time position of the
FB pin accurately (<1 ns). This position information is then used
by the subpixel blender in dynamic switching modes, enabling
the ADV7188 to implement high performance multiplexing
between the CVBS and RGB sources even when the RGB data
source is completely asynchronous to the sampling crystal reference.
An antialiasing filter is required on all four data channels (R, G,
B, and CVBS). The order of this filter is reduced because all signals
are sampled at 54 MHz.
The switched or blended data is output from the ADV7188 in
the standard output formats (see Table 102).
FAST BLANK CONTROL
FB_MODE [1:0], Address 0xED [1:0]
FB_MODE controls which fast blank mode is selected.
Table 12. FB_MODE [1:0] Function
FB_MODE [1:0]
Description
00 (default)
Static switch mode
01
Fixed alpha blending
10
Dynamic switching (fast mux)
11
Dynamic switching with edge enhancement
Static Mux Selection Control
CVBS_RGB_SEL, Address 0xED [2]
CVBS_RGB_SEL controls whether the video from the CVBS or
RGB source is selected for output from the ADV7188.
0 (default)—Data from the CVBS source is selected for output.
1—Data from the RGB source is selected for output.
Alpha Blend Coefficient
MAN_ALPHA_VAL [6:0], Address 0xEE [6:0]
When fixed alpha blending is selected (FB_MODE [1:0] = 01),
MAN_ALPHA_VAL [6:0] determines the proportion in which
the video from the CVBS and RGB sources are blended. Equation
1 shows how these bits affect the video output.
64
]
0
6
[
_
64
]
0
6
[
_
1
:
VAL
ALPHA
MAN
Video
:
VAL
ALPHA
MAN
Video
RGB
CVBS
out
×
+
×
=
(1)
The maximum valid value for MAN_ALPHA_VAL [6:0] is
1000000, such that the alpha blender coefficients remain
between 0 and 1. The default value for MAN_ALPHA_VAL [6:0]
is 0000000.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| ADV7189 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat SDTV Video Decoder |
| ADV7189B | 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat SDTV Video Decoder |
| ADV7189BBSTZ | 功能描述:IC VIDEO DECODER SDTV 80-LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉換器 系列:- 產品變化通告:Development Systems Discontinuation 26/Apr/2011 標準包裝:1 系列:- 類型:編碼器 應用:DVB-S.2 系統(tǒng) 電壓 - 電源，模擬:- 電壓 - 電源，數字:- 安裝類型:- 封裝/外殼:模塊 供應商設備封裝:模塊 包裝:散裝 其它名稱:Q4645799 |
| ADV7189BBSTZ268H | 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat SDTV Video Decoder |
| ADV7189BBSTZ268H2 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat SDTV Video Decoder |
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