參數(shù)資料
型號(hào)： ADV7188BSTZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 44/112頁(yè)
文件大小： 0K
描述： IC DECODER VID MULTIFORM 80LQFP
標(biāo)準(zhǔn)包裝： 1
類(lèi)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(lèi)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(pán)
ADV7188
Rev. A | Page 37 of 112
BETACAM, Enable BETACAM Levels, Address 0x01 [5]
If YPrPb data is routed through the ADV7188, the automatic
gain control modes can target different video input levels, as
outlined in Table 44. Note that 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:
section describes how component video (YPrPb) can be
routed through the ADV7188.
The Video Standard Selection section describes the various
standards, for example, with and without pedestal.
The automatic gain control (AGC) algorithms adjust the levels
based on the setting of the BETACAM bit.
Table 43. BETACAM Function
BETACAM
Description
0 (default)
Standard video input (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
BETACAM input enable (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
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. LAGC [2:0]
must be set to the appropriate mode to enable the peak white or
average video mode.
For more information, refer to the LAGC [2:0], Luma Automatic
0—Updates the gain once per video line.
1 (default)—Updates the gain once per field.
Table 44. BETACAM Levels
Name
BETACAM (mV)
BETACAM Variant (mV)
SMPTE (mV)
MII (mV)
Y Range
0 to 714 (including 7.5% pedestal)
0 to 714
0 to 700
0 to 700 (including 7.5% pedestal)
Pr and Pb Ranges
467 to +467
505 to +505
350 to +350
324 to +324
Sync Depth
286
300
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