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參數(shù)資料
| 型號： | THS7374IPWRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 4 CHANNEL, VIDEO AMPLIFIER, PDSO14 |
| 封裝： | GREEN, PLASTIC, TSSOP-14 |
| 文件頁數(shù)： | 18/40頁 |
| 文件大小： | 929K |
| 代理商： | THS7374IPWRG4 |
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75 W
Y'/G'Out
CVBS/Sync
CVBS
+3.3V
R
DAC/Encoder
SDTV
CVBS
S-Video
Y'P' P'
R'G'B'
B
R
Y'/G'
R
P' /B'
B
R
P' /R'
R
1
2
3
4
5
6
7
14
13
12
11
10
9
8
CH1OUT
CH2OUT
CH3OUT
CH4OUT
V
S+
BYPASS
NC
CH1IN
CH2IN
CH3IN
CH4IN
GND
DISABLE
NC
THS7374
ToGPIOController
orGND
75 W
P’ /B'Out
B
75 W
P’ /R'Out
R
75 W
+3Vto+5V
0.1 F
m
(1)
0.1 F
m
(1)
0.1 F
m
(1)
0.1 F
m
(1)
R
PU
+3.3V
R
PU
330 F
m
(2)
+
75 W
CVBSOut1
75 W
330 F
m
(2)
+
75 W
Y'Out1
75 W
330 F
m
(2)
+
75 W
P' Out1
B
75 W
330 F
m
(2)
+
75 W
P' Out1
R
75 W
330 F
m
(2)
+
330 F
m
(2)
+
330 F
m
(2)
+
330 F
m
(2)
+
www.ti.com
SLOS590B – JULY 2008 – REVISED JANUARY 2011
OUTPUT MODE OF OPERATION: AC
This
configuration
helps
ensure
line-to-line
dc
COUPLED
isolation and avoids the potential problems discussed
above. Using a single 1000-mF capacitor for two lines
A very common method of coupling the video signal
can be done, but there is a chance for ground loops
to the line is the use of a large capacitor. This
and interference to be created between the two
capacitor is typically between 220 mF and 1000 mF,
receivers.
although 470 mF is very common. The value of this
capacitor must be large enough to minimize the line
Lastly, because of the edge rates and frequencies of
tilt (droop) and/or field tilt associated with ac coupling
operation, it is recommended (but not required) to
as
described
previously
in
this
document.
AC
place a 0.1-mF to 0.01-mF capacitor in parallel with
coupling is done for several reasons, but most often
the large 220-mF to 1000-mF capacitor. These
to ensure full interoperability with the receiving video
large-value
capacitors
are
generally
aluminum
system. AC coupling also ensures adherence to video
electrolytic. It is well-known that these capacitors
standard specifications. It ensures that regardless of
have significantly large equivalent series resistance
the reference dc voltage used on the transmit side,
(ESR), and the impedance at high frequencies is
the receive side re-establishes the dc reference
rather large because of the associated inductances
voltage to its own requirements.
involved with the leads and construction. The small
0.1-mF
to
0.01-mF
capacitors
help
pass
these
As with the dc output mode of operation discussed
high-frequency (> 1-MHz) signals with much lower
previously, each line should have a 75-
source
impedance than the large capacitors.
termination resistor in series with the ac coupling
capacitor. If two lines are to be driven, it is best to
Although it is common to use the same capacitor
have each line use its own capacitor and resistor
values for all the video lines, the frequency bandwidth
rather than sharing these components, as shown in
of the chroma signal in a s-video system are not
required to go as low (or as high of a frequency) as
the luma channels. Thus, the capacitor values of the
chroma line(s) can be smaller, such as 0.1 mF.
(1) An ac-coupled input is shown in this example. DC coupling is also allowed as long as the DAC output voltage is within the allowable
linear input and output voltage range of the THS7374. To dc-couple, remove the 0.1mF input capacitors and RPU.
(2) An ac-coupled output is shown in this example. DC coupling is also allowed by simply removing these capacitors.
Figure 62. Typical SDTV AC-Input System Driving Two AC-Coupled Video Lines
Copyright 2008–2011, Texas Instruments Incorporated
25
Product Folder Link(s): THS7374
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| THS7375 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4-Channel SDTV Video Amplifier with 6th-Order Filters and 5.6-V/V Gain |
| THS7375EVM | 功能描述:放大器 IC 開發(fā)工具 THS7375 Eval Mod RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V |
| THS7375IPW | 功能描述:視頻放大器 4Ch SDTV Video Amp RoHS:否 制造商:ON Semiconductor 通道數(shù)量:4 電源類型: 工作電源電壓:3.3 V, 5 V 電源電流: 最小工作溫度: 最大工作溫度: 封裝 / 箱體:TSSOP-14 封裝:Reel |
| THS7375IPWG4 | 功能描述:視頻放大器 4Ch SDTV Video Amp w/6th order fltr RoHS:否 制造商:ON Semiconductor 通道數(shù)量:4 電源類型: 工作電源電壓:3.3 V, 5 V 電源電流: 最小工作溫度: 最大工作溫度: 封裝 / 箱體:TSSOP-14 封裝:Reel |
| THS7375IPWR | 功能描述:視頻放大器 4Ch SDTV Video Amp RoHS:否 制造商:ON Semiconductor 通道數(shù)量:4 電源類型: 工作電源電壓:3.3 V, 5 V 電源電流: 最小工作溫度: 最大工作溫度: 封裝 / 箱體:TSSOP-14 封裝:Reel |
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