參數(shù)資料
型號(hào)： ADV7183BKSTZ
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(yè)數(shù)： 32/100頁(yè)
文件大?。?/td> 844K
代理商： ADV7183BKSTZ
ADV7183B
For example, program the ADV7183B into manual fixed gain
mode with a desired gain of 0.89.
1.
Use Equation 1 to convert the gain:
0.89 × 2048 = 1822.72
2.
Truncate to integer value:
1822.72 = 1822
3.
Convert to hexadecimal:
1822d = 0x71E
4.
Split into two registers and program:
Luma Gain Control 1[3:0] = 0x7
Luma Gain Control 2[7:0] = 0x1E
5.
Enable manual fixed gain mode:
Set LAGC[2:0] to 000
BETACAM Enable Betacam Levels, Address 0x01[5]
If YPrPb data is routed through the ADV7183B, the automatic
gain control modes can target different video input levels, as
outlined in
192H
Figure 40. The BETACAM bit is valid only if the
input mode is YPrPb (component). The BETACAM bit sets the
target value for AGC operation.
A review of the following sections is useful:
component video (YPrPb) can be routed through the
ADV7183B.
such as those with and without pedestal.
The automatic gain control (AGC) algorithms adjust the levels
based on the setting of the BETACAM bit (see
195H
Table 37).
Table 37. BETACAM Function
BETACAM
Description
0 (default)
Assuming YPrPb is selected as input format
Selecting PAL with pedestal selects MII
Selecting PAL without pedestal selects SMPTE
Selecting NTSC with pedestal selects MII
Selecting NTSC without pedestal selects SMPTE
1
Assuming YPrPb is selected as input format
Selecting PAL with pedestal selects BETACAM
Selecting PAL without pedestal selects BETACAM
variant
Selecting NTSC with pedestal selects BETACAM
Selecting NTSC without pedestal selects BETACAM
variant
Rev. B | Page 32 of 100
193H
INSEL[3:0] Input Selection, Address 0x00[3:0] to find how
194H
Video Standard Selection to select the various standards,
Table 40. Betacam Levels
Name
Y Range
Pb and Pr Range
Sync Depth
PW_UPD Peak White Update, Address 0x2B[0]
The peak white and average video algorithms determine the
gain based on measurements taken from the active video. The
PW_UPD bit determines the rate of gain change. The
LAGC[2:0] must be set to the appropriate mode to enable the
peak white or average video mode in the first place. For more
information, refer to the
196H
LAGC[2:0] Luma Automatic Gain
Control,
Address 0x2C[7:0] section.
Setting PW_UPD to 0 updates the gain once per video line.
Setting PW_UPD to 1 (default) updates the gain once per field.
Chroma Gain
CAGC[1:0] Chroma Automatic Gain Control,
Address 0x2C[1:0]
The two bits of the Color Automatic Gain Control mode select
the basic mode of operation for automatic gain control in the
chroma path.
Table 38. CAGC Function
CAGC[1:0]
Description
00
Manual fixed gain (use CMG[11:0])
01
Use luma gain for chroma
10 (default)
Automatic gain (based on color burst)
11
Freeze chroma gain
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 con-
trol. This register has an effect only if the CAGC[1:0] register is
set to 10 (automatic gain).
Table 39. CAGT Function
CAGT[1:0]
Description
00
Slow (TC = 2 sec)
01
Medium (TC = 1 sec)
10
Fast (TC = 0.2 sec)
11 (default)
Adaptive
Betacam (mV)
0 to 714 (includes 7.5% pedestal)
–467 to +467
286
Betacam Variant (mV)
0 to 714
–505 to +505
286
SMPTE (mV)
0 to 700
–350 to +350
300
MII (mV)
0 to 700 (includes 7.5% pedestal)
–324 to +324
300
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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
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ADV7185KST 制造商:AD 制造商全稱:Analog Devices 功能描述:Professional NTSC/PAL Video Decoder with 10-Bit CCIR656 Output
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