参数资料
| 型号： | ADV7184BSTZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 22/112页 |
| 文件大小： | 0K |
| 描述： | IC DECODER VID SDTV MULTI 80LQFP |
| 标准包装： | 1 |
| 类型： | 视频解码器 |
| 应用： | 投影仪，录音机，安全 |
| 电压 - 电源，模拟： | 3.15 V ~ 3.45 V |
| 电压 - 电源，数字： | 1.65 V ~ 2 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 80-LQFP |
| 供应商设备封装： | 80-LQFP（14x14） |
| 包装： | 托盘 |
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ADV7184
Rev. A | Page 17 of 112
The alpha blend factor is selected with the I2C signal
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 ADV7184 fast blanking configuration is
shown in Figure 9.
The CVBS signal is processed by the ADV7184 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 ADV7184 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 ADV7184 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 ADV7184.
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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| ADV7186BBCZ | 功能描述:IC VIDEO DECODER 196CSPBGA RoHS:是 类别:集成电路 (IC) >> 线性 - 视频处理 系列:- 产品变化通告:Product Discontinuation 07/Mar/2011 标准包装:3,000 系列:OMNITUNE™ 类型:调谐器 应用:移动电话，手机，视频显示器 安装类型:表面贴装 封装/外壳:65-WFBGA 供应商设备封装:PG-WFSGA-65 包装:带卷 (TR) 其它名称:SP000365064 |
| ADV7186BBCZ-RL | 功能描述:IC VIDEO DECODER 196CSPBGA RoHS:是 类别:集成电路 (IC) >> 线性 - 视频处理 系列:- 产品变化通告:Product Discontinuation 07/Mar/2011 标准包装:3,000 系列:OMNITUNE™ 类型:调谐器 应用:移动电话，手机，视频显示器 安装类型:表面贴装 封装/外壳:65-WFBGA 供应商设备封装:PG-WFSGA-65 包装:带卷 (TR) 其它名称:SP000365064 |
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