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參數(shù)資料
| 型號(hào)： | ADV7189BKSTZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 29/104頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DECODER VIDEO W/ADC 80LQFP |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 類型： | 視頻解碼器 |
| 應(yīng)用： | 機(jī)頂盒，視頻播放器，錄音機(jī) |
| 電壓 - 電源，模擬： | 3.15 V ~ 3.45 V |
| 電壓 - 電源，數(shù)字： | 1.65 V ~ 2 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 80-LQFP |
| 供應(yīng)商設(shè)備封裝： | 80-LQFP（14x14） |
| 包裝： | 托盤 |
| 產(chǎn)品目錄頁面： | 788 (CN2011-ZH PDF) |
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ADV7189B
Rev. B | Page 30 of 104
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 auto-selection options
automatically select from the filter options to give the specified
response. (See settings 000 and 001 in
182H
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
0
–10
–20
–30
–40
–50
–60
05
4
3
2
16
04983-0-016
FREQUENCY (MHz)
COMBINED C ANTIALIAS, C SHAPING FILTER,
C RESAMPLER
ATTE
NUATION
(dB)
Figure 16. Chroma Shaping Filter Responses
183H
Figure 16 shows the responses of SH1 (narrowest) to SH5
(widest) in addition to the wideband mode.
GAIN OPERATION
The gain control within the ADV7189B 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.
Advantages of this architecture over the commonly used
programmable gain amplifier (PGA) before the ADCs include
the fact that the gain is now completely independent of supply,
temperature, and process variations.
As shown in
184H
Figure 17, the ADV7189B 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 it resides
on. The dc level is set by the clamping circuitry (see the
185H
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 ADV7189B’s ability to retrieve horizontal
and vertical timing and to lock to the colorburst, 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
186H
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 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
187H
Luma Gain and the
188H
Chroma Gain sections.
04983-0-017
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
Figure 17. Gain Control Overview
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADV7189BKSTZ10F | 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat SDTV Video Decoder |
| ADV7189BKSTZ10F2 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat SDTV Video Decoder |
| ADV7189BST | 制造商:Analog Devices 功能描述: |
| ADV7189KST | 制造商:Rochester Electronics LLC 功能描述:12BIT NTSC/PAL/SECAMVIDDECOD I.C. - Tape and Reel 制造商:Analog Devices 功能描述:IC VIDEO ENCODER |
| ADV7189XST | 制造商:Analog Devices 功能描述:54MHZ NTSC/PAL ENCODER(DNR+MACROVISON)IC - Bulk |
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