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| 型號： | ADV7183B |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Multiformat SDTV Video Decoder |
| 中文描述： | 標(biāo)清多格式視頻解碼器 |
| 文件頁數(shù)： | 30/100頁 |
| 文件大小： | 844K |
| 代理商： | ADV7183B |
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ADV7183B
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, SH1 to SH5 and wideband mode for
the chrominance signal. The autoselection options automa-
tically select from the filter options to give the specified
response. (See settings 000 and 001 in
184H
Table 32).
Table 32. CSFM Function
CSFM[2:0]
Description
000 (default)
Autoselect 1.5 MHz bandwidth
001
Autoselect 2.17 MHz bandwidth
010
SH1
011
SH2
100
SH3
101
SH4
110
SH5
111
Wideband mode
Rev. B | Page 30 of 100
0
–10
–20
–30
–40
–50
–60
0
5
4
3
2
1
6
FREQUENCY (MHz)
COMBINED C AC RESAMPLER
A
0
Figure 16. Chroma Shaping Filter Responses
185H
Figure 16 shows the responses of SH1 (narrowest) to SH5
(widest) and the wide band mode (in red).
GAIN OPERATION
The gain control within the ADV7183B is performed strictly on
a digital basis. The input ADCs support a 10-bit range, mapped
into a 1.6 V analog voltage range. Gain correction occurs after
the digitization in the form of a digital multiplier.
One advantage of this architecture over the commonly used
programmable gain amplifier (PGA) before the ADCs is that
the gain is now completely independent of supply, temperature,
and process variations.
As shown in
186H
Figure 17, the ADV7183B can decode a video
signal providing it fits into the ADC window. 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
187H
Clamp Operation section).
If the amplitude of the analog video signal is too high, clipping
can 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 ADV7183B’s ability to retrieve horizontal
and vertical timing and to lock to the color burst, if present.
There are two gain control units, one each 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
188H
Table 33.
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. The ACG
determined gain stays active until the automatic gain control
loop is either unfrozen, or the gain mode of the 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
189H
Luma Gain and
190H
Chroma Gain sections.
ANALOG VOLTAGE
RANGE SUPPORTED BY ADC (1.6V RANGE FOR ADV7189B)
DATA
PRE-
PROCESSOR
(DPP)
ADC
SDP
(GAIN SELECTION ONLY)
MAXIMUM
VOLTAGE
MINIMUM
VOLTAGE
CLAMP
LEVEL
GAIN
CONTROL
0
Figure 17. Gain Control Overview
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADV7183BBSTZ | Multiformat SDTV Video Decoder |
| ADV7183BKSTZ | Multiformat SDTV Video Decoder |
| ADV7183KST | Advanced Video Decoder with 10-Bit ADC and Component Input Support |
| AD7183 | Advanced Video Decoder with 10-Bit ADC and Component Input Support |
| ADV7185 | Professional NTSC/PAL Video Decoder with 10-Bit CCIR656 Output |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADV7183BBSTZ | 功能描述:IC VIDEO DECODER NTSC 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 |
| ADV7183BKST | 制造商:Analog Devices 功能描述:MULTIFORMAT SDTV VID DECODER 80LQFP - Bulk |
| ADV7183BKSTZ | 功能描述:IC VIDEO DECODER NTSC 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 |
| ADV7183KST | 制造商:Analog Devices 功能描述:Video Decoder 2ADC 10-Bit 80-Pin LQFP 制造商:Rochester Electronics LLC 功能描述:VIDEO DECODER I.C. - Bulk |
| ADV7184 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat SDTV Video Decoder with Fast Switch Overlay Support |
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