參數(shù)資料
型號(hào): LT6551CMS
廠商: LINEAR TECHNOLOGY CORP
元件分類: 音頻/視頻放大
英文描述: 3.3V Triple and Quad Video Amplifiers
中文描述: 1 CHANNEL, VIDEO AMPLIFIER, PDSO10
封裝: 3 X 5 MM, PLASTIC, MSOP-10
文件頁數(shù): 14/16頁
文件大?。?/td> 514K
代理商: LT6551CMS
LT6550/LT6551
14
65501f
+
450
450
+
450
450
+
450
450
1
R
G
B
P
R
Y
P
B
2
3
4
5
9
10
8
7
1070
549
2940
75
75
174
LT6550
261
75
–3.3V
3.3V
3.3V
+
450
450
+
450
450
+
450
450
1
2
3
4
5
9
10
8
7
105
75
133
LT6550
–3.3V
6550/51 TAO3
Y = 0.299R + 0.587G + 0.114B
P
B
= 0.565(B – Y)
P
R
= 0.713(R – Y)
f
3dB
44MHz
RGB to YP
B
P
R
Component-Video Conversion
TYPICAL APPLICATIO
U
Consumer products require generation of YP
B
P
R
lumi-
nance/chrominance component signals, often from RGB
source content. The YP
B
P
R
format has a luminance signal
and two weighted color difference signals at baseband.
Even with their fixed internal gain resistors, two LT6550s
connected as shown easily implement the required con-
version matrix equations. The Y channel is a weighted
average of the 2X amplified RGB signals and with the
feedback connection of the Y channel output in the second
LT6550 back to the gain-resistor common pin, an implicit
Y subtraction is performed for the chroma channels and
the desired unity gain is produced for the Y-channel. The
necessary scaling of the color-difference signals is per-
formed passively by their respective output termination
resistor networks. Since this circuit naturally produces
bipolar chroma signals (
±
0.35V at the cable load) regard-
less of RGB offset, the simplest implementation is to
power the circuit with
±
3.3V split supplies. With an avail-
able output swing of about 5.6V for this supply configura-
tion, the circuit handles video with composite syncs and/
or various offsets without difficulty.
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