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| 型號： | ADV7180 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 10-Bit, 4 x Oversampling SDTV Video Decoder |
| 中文描述： | 10位，4個采樣標清視頻解碼器 |
| 文件頁數(shù)： | 35/112頁 |
| 文件大?。?/td> | 1320K |
| 代理商： | ADV7180 |
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ADV7180
CAGT[1:0], Chroma Automatic Gain Timing,
Address 0x2D [7:6]
The chroma automatic gain timing register allows the user to
influence the tracking speed of the chroma automatic gain
control. This register has an effect only if the CAGC[1:0]
register is set to 10 (automatic gain).
Rev. A | Page 35 of 112
Table 41. CAGT Function
CAGT[1:0]
00
01
10
11 (default)
CG[11:0], Chroma Gain, Address 0x2D [3:0],
Address 0x2E [7:0]; CMG[11:0], Chroma Manual Gain,
Address 0x2D [3:0], Address 0x2E [7:0]
Chroma gain [11:0] is a dual-function register. If written to, a
desired manual chroma gain can be programmed. This gain
becomes active if the CAGC[1:0] mode is switched to manual
fixed gain. Refer to Equation 2 for calculating a desired gain.
If read back, this register returns the current gain value.
Depending on the setting in the CAGC[1:0] bits, this is either:
The chroma manual gain value (CAGC[1:0] set to chroma
manual gain mode).
The chroma automatic gain value (CAGC[1:0] set to any of
the automatic modes).
Description
Slow (TC = 2 sec)
Medium (TC = 1 sec)
Fast (TC = 0.2 sec)
Adaptive
Table 42. CG/CMG Function
CG[11:0]/CMG[11:0]
CMG[11:0]
Read/Write
Write
Description
Manual gain for chroma
path
Currently active gain
CG[11:0]
Read
Chroma_Gain
≤
<
650
)
4095
0
CG
0 . . . 6.29
(2)
For example, freezing the automatic gain loop and reading back
the CG[11:0] register results in a value of 0x47A as follows:
1.
Convert the readback value to decimal:
0x47A = 1146d
2.
Apply Equation 2 to convert the readback value:
1146/1024 = 1.12
CKE, Color Kill Enable, Address 0x2B [6]
The color kill enable bit allows the optional color kill function
to be switched on or off.
For QAM-based video standards (PAL and NTSC) as well as
FM-based systems (SECAM), the threshold for the color kill
decision is selectable via the CKILLTHR[2:0] bits.
If color kill is enabled and the color carrier of the incoming
video signal is less than the threshold for 128 consecutive video
lines, color processing is switched off (black and white output).
To switch the color processing back on, another 128 consecutive
lines with a color burst greater than the threshold are required.
The color kill option only works for input signals with a
modulated chroma part. For component input (YPrPb), there is
no color kill.
Setting CKE to 0 disables color kill.
Setting CKE to 1 (default) enables color kill.
CKILLTHR[2:0], Color Kill Threshold, Address 0x3D
[6:4]
The CKILLTHR[2:0] bits allow the user to select a threshold for
the color kill function. The threshold applies to only QAM-
based (NTSC and PAL) or FM-modulated (SECAM) video
standards.
To enable the color kill function, the CKE bit must be set. For
Settings 000, 001, 010, and 011, chroma demodulation inside
the ADV7180 may not work satisfactorily for poor input video
signals.
Table 43. CKILLTHR Function
CKILLTHR[2:0]
000
001
010
011 (default)
100
101
110
111
Description
SECAM
No color kill
Kill at <5%
Kill at <7%
Kill at <8%
Kill at <9.5%
Kill at <15%
Kill at <32%
Reserved for Analog Devices internal use only.
Do not select.
NTSC, PAL
Kill at <0.5%
Kill at <1.5%
Kill at <2.5%
Kill at <4.0%
Kill at <8.5%
Kill at <16.0%
Kill at <32.0%
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADV7180BCPZ | 10-Bit, 4 x Oversampling SDTV Video Decoder |
| ADV7180BSTZ | 10-Bit, 4 x Oversampling SDTV Video Decoder |
| ADV7181 | Multiformat SDTV Video Decoder |
| ADV7181B | Multiformat SDTV Video Decoder |
| ADV7181BBCPZ | Multiformat SDTV Video Decoder |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADV7180_12 | 制造商:AD 制造商全稱:Analog Devices 功能描述:10-Bit, 4?? Oversampling SDTV Video Decoder |
| ADV7180BCP32Z | 制造商:Analog Devices 功能描述:10-BIT, 4? OVERSAMPLING SDTV VIDEO DECODER - Trays |
| ADV7180BCP32Z-RL | 制造商:Analog Devices 功能描述:IC |
| ADV7180BCPZ | 功能描述:IC VIDEO DECODER SDTV 40-LFCSP RoHS:是 類別:集成電路 (IC) >> 線性 - 視頻處理 系列:- 標準包裝:250 系列:- 類型:電平移位器 應(yīng)用:LCD 電視機/監(jiān)控器 安裝類型:表面貼裝 封裝/外殼:28-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:28-WQFN（4x4）裸露焊盤 包裝:帶卷 (TR) 其它名稱:296-32523-2TPS65198RUYT-ND |
| ADV7180BCPZ | 制造商:Analog Devices 功能描述:IC VIDEO DECODER 10BIT 57.27MSPS LFCSP40 |
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