參數(shù)資料
型號(hào)： ADV7183AKST
廠商： ANALOG DEVICES INC
元件分類： 顏色信號(hào)轉(zhuǎn)換
英文描述： Multiformat SDTV Video Decoder
中文描述： COLOR SIGNAL DECODER, PQFP80
封裝： LEAD FREE, MS-026-BEC, LQFP-80
文件頁數(shù)： 33/104頁
文件大?。?/td> 894K
代理商： ADV7183AKST
ADV7183A
Table 64. SDP AGC Modes
Input Video Type
Any
CVBS
Rev. A | Page 33 of 104
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.
SDP Luma Gain
LAGC[2:0] Luma Automatic Gain Control (SDP), Address
0x30, [7:0]
The luma automatic gain control mode bits select the mode of
operation for the gain control in the luma path.
There are ADI internal parameters to customize the peak white
gain control. Contact ADI for more information.
Table 65. LAGC Function
LAGC[2:0]
Description
000
Manual fixed gain (use LMG[11:0]).
001
AGC (blank level to sync tip). No override through
white peak.
010*
AGC (blank level to sync tip). Automatic override
through white peak.
011
Reserved.
100
Reserved.
101
Reserved.
110
Reserved.
111
Freeze gain.
*Default value.
LAGT[1:0] Luma Automatic Gain Timing (SDP),
Address 0x2F, [7:6]
The luma automatic gain timing register allows the user to
influence the tracking speed of the luminance automatic gain
control. Please note that this register only has an effect if the
LAGC[2:0] register is set to 001, 010, 011, or 100 (automatic
gain control modes).
If peak white AGC is enabled and active (see the
STATUS_1[7:0] Address 0x10, [7:0] section), the actual gain
update speed is dictated by the peak white AGC loop and, as a
result, the LAGT settings have no effect. As soon as the part
leaves peak white AGC, LAGT becomes relevant again.
The update speed for the peak white algorithm can be
customized by the use of internal parameters. Please contact
ADI for more information.
Table 66. LAGT Function
LAGT[1:0]
00
01
10
11*
*Default value.
Description
Slow (TC = 2 sec)
Medium (TC = 1 sec)
Fast (TC = 0.2 sec)
Adaptive
LG[11:0] Luma Gain (SDP), Address 0x2F, [3:0];
Address 0x30, [7:0]; LMG[11:0] Luma Manual Gain (SDP),
Address 0x2F, [3:0]; Address 0x30, [7:0]
Luma gain [11:0] is a dual function register:
If written to, a desired manual luma gain can be
programmed. This gain becomes active if the LAGC[2:0]
mode is switched to manual fixed gain.
Equation 1 shows how to calculate a desired gain.
If read back, this register returns the current gain
value.
Depending on the setting in the ALCM[2:0] bits, this is one
of the following values:
o
Luma manual gain value (ALCM[2:0] set to luma
manual gain mode)
o
Luma automatic gain value (ALCM[2:0] set to any of
the automatic modes)
Table 67. LG/LMG Function
LG[11:0]/LMG[11:0]
Read/Write
LMG[11:0] = X
Write
Description
Manual gain for luma
path.
Actually used gain.
)
...
0
2048
LG[11:0]
Read
(
2
4095
0
_
=
≤
<
=
LG
Gain
Luma
Equation 1. SDP Luma Gain Formula
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