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參數(shù)資料
| 型號(hào)： | ADV7188 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Multiformat SDTV Video Decoder with Fast Switch Overlay Support |
| 中文描述： | 標(biāo)清多格式視頻解碼器支持快速開關(guān)重疊 |
| 文件頁數(shù)： | 32/112頁 |
| 文件大?。?/td> | 943K |
| 代理商： | ADV7188 |
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ADV7188
CSFM[2:0] C-Shaping Filter Mode, Address 0x17 [7]
The C-shaping filter mode bits allow the user to select from a
range of low-pass filters for the chrominance signal.
Table 38. CSFM Function
CSFM[2:0]
Description
000 (default)
1.5 MHz bandwidth filter
001
2.17 MHz bandwidth filter
010
SH1
011
SH2
100
SH3
101
SH4
110
SH5
111
Wideband mode
GAIN OPERATION
The gain control within the ADV7188 is done on a purely
digital basis. The input ADCs support a 12-bit range, mapped
into a 1.6 V analog voltage range. Gain correction takes place
after the digitization in the form of a digital multiplier.
Rev. 0 | Page 32 of 112
Advantages of this architecture over the commonly used PGA
(programmable gain amplifier) before the ADCs include that
the gain is now completely independent of supply, temperature,
and process variations.
As shown in Figure 21, the ADV7188 can decode a video signal
as long as it fits into the ADC window.
The two components to this are the amplitude of the input signal
and the dc level on which it resides. The dc level is set by the
clamping circuitry (see the Clamp Operation section).
If the amplitude of the analog video signal is too high, clipping
may occur resulting in visual artifacts. The analog input range
of the ADC, together with the clamp level, determines the
maximum supported amplitude of the video signal.
The minimum supported amplitude of the input video is
determined by the ADV7188’s ability to retrieve horizontal and
vertical timing and to lock to the color burst, if present.
There are separate gain control units for luma and chroma data.
Both can operate independently of each other. The chroma unit,
however, can also take its gain value from the luma path.
The possible AGC modes are summarized in Table 39.
It is possible to freeze the automatic gain control loops. This
causes the loops to stop updating and the AGC-determined
gain at the time of the freeze to stay active until the loop is
either unfrozen or the gain mode of operation is changed.
The currently active gain from any of the modes can be read
back. Refer to the description of the dual-function manual gain
registers, LG[11:0] Luma Gain and CG[11:0] Chroma Gain, in
the Luma Gain and the Chroma Gain sections.
0
ANALOG VOLTAGE
RANGE SUPPORTED BY ADC (1.6V RANGE FOR ADV7188)
DATA
PRE-
PROCESSOR
(DPP)
ADC
SDP
(GAIN SELECTION ONLY)
MAXIMUM
VOLTAGE
MINIMUM
LEVEL
GAIN
CONTROL
Figure 21. Gain Control Overview
Table 39. AGC Modes
Input Video Type
Any
CVBS
Luma Gain
Manual gain luma.
Dependent on horizontal sync depth.
Chroma Gain
Manual gain chroma.
Dependent on color burst amplitude.
Taken from luma path.
Dependent on color burst amplitude.
Taken from luma path.
Dependent on color burst amplitude.
Taken from luma path.
Dependent on color burst amplitude.
Taken from luma path.
Taken from luma path.
Peak white.
Dependent on horizontal sync depth.
Y/C
Peak white.
YPrPb
Dependent on horizontal sync depth.
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| ADV7189BBSTZ268H | Multiformat SDTV Video Decoder |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADV7188BSTZ | 功能描述:IC DECODER VID MULTIFORM 80LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉(zhuǎn)換器 系列:- 產(chǎn)品變化通告:Development Systems Discontinuation 26/Apr/2011 標(biāo)準(zhǔn)包裝:1 系列:- 類型:編碼器 應(yīng)用:DVB-S.2 系統(tǒng) 電壓 - 電源，模擬:- 電壓 - 電源，數(shù)字:- 安裝類型:- 封裝/外殼:模塊 供應(yīng)商設(shè)備封裝:模塊 包裝:散裝 其它名稱:Q4645799 |
| 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(zhuǎn)換器 系列:- 產(chǎn)品變化通告:Development Systems Discontinuation 26/Apr/2011 標(biāo)準(zhǔn)包裝:1 系列:- 類型:編碼器 應(yīng)用:DVB-S.2 系統(tǒng) 電壓 - 電源，模擬:- 電壓 - 電源，數(shù)字:- 安裝類型:- 封裝/外殼:模塊 供應(yīng)商設(shè)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 |
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