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參數(shù)資料
| 型號： | THS7368IPW |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 6 CHANNEL, VIDEO AMPLIFIER, PDSO20 |
| 封裝： | GREEN, TSSOP-20 |
| 文件頁數(shù)： | 20/40頁 |
| 文件大?。?/td> | 1123K |
| 代理商： | THS7368IPW |
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www.ti.com
SBOS497 – DECEMBER 2009
channels. One way to help ensure this condition is
In the same way as the dc output mode of operation
satisfied is to make sure the 75-
source resistor is
discussed previously, each line should have a 75-
placed next to each THS7368 output pin. If a large
source
termination
resistor
in
series
with
the
ac-coupling capacitor is used, the capacitor should be
ac-coupling capacitor. This 75-
resistor should be
placed after this resistor.
placed next to the THS7368 output to minimize
capacitive loading effects. If two lines are to be
There are many reasons dc-coupling is desirable,
driven, it is best to have each line use its own
including reduced costs, PCB area, and no line tilt. A
capacitor and resistor rather than sharing these
common question is whether or not there are any
components.
This
configuration
helps
ensure
drawbacks to using dc-coupling. There are some
line-to-line dc isolation and eliminates the potential
potential issues that must be examined, such as the
problems as described previously. Using a single,
dc current bias as discussed above. Another potential
1000-
μF capacitor for two lines is permissible, but
risk is whether this configuration meets industry
there is a chance for interference between the two
standards. EIA-770 stipulates that the back-porch
receivers.
shall be 0 V ± 1 V as measured at the receiver. With
a double-terminated load system, this requirement
Lastly, because of the edge rates and frequencies of
implies a 0 V ± 2 V level at the video amplifier output.
operation, it is recommended (but not required) to
The THS7368 can easily meet this requirement
place a 0.1-
μF to 0.01-μF capacitor in parallel with
without issue. However, in Japan, the EIAJ CP-1203
the large 220-
μF to 1000-μF capacitor. These large
specification stipulates a 0 V ± 0.1 V level with no
value capacitors are most commonly aluminum
signal. This requirement can be met with the
electrolytic. It is well-known that these capacitors
THS7368 in shutdown mode, but while active it
have significantly large equivalent series resistance
cannot
meet
this
specification
without
output
(ESR), and the impedance at high frequencies is
ac-coupling.
AC-coupling
the
output
essentially
rather large as a result of the associated inductances
ensures that the video signal works with any system
involved with the leads and construction. The small
and any specification. For many modern systems,
0.1-
μF
to
0.01-
μF
capacitors
help
pass
these
however, dc-coupling can satisfy most needs.
high-frequency signals (greater than 1 MHz) with
much lower impedance than the large capacitors.
OUTPUT MODE OF OPERATION:
Although it is common to use the same capacitor
AC-COUPLED
values for all the video lines, the frequency bandwidth
of the chroma signal in a S-Video system is not
A very common method of coupling the video signal
required to go as low (or as high of a frequency) as
to the line is with a large capacitor. This capacitor is
the luma channels. Thus, the capacitor values of the
typically between 220
μF and 1000 μF, although 470
chroma line(s) can be smaller, such as 0.1
μF.
μF is very typical. The value of this capacitor must be
large enough to minimize the line tilt (droop) and/or
Figure 42 shows a typical configuration where the
field tilt associated with ac-coupling as described
input is ac-coupled and the output is also ac-coupled.
previously
in
this
document.
AC-coupling
is
AC-coupled inputs are generally required when
performed for several reasons, but the most common
current-sink DACs are used or the input is connected
is to ensure full interoperability with the receiving
to an unknown source, such as when the THS7368 is
video system. This approach ensures that regardless
used as an input device.
of the reference dc voltage used on the transmitting
side,
the
receiving
side
re-establishes
the
dc
reference voltage to its own requirements.
Copyright 2009, Texas Instruments Incorporated
27
Product Folder Link(s): THS7368
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| THS7368IPW | 制造商:Texas Instruments 功能描述:Video Amplifier IC 制造商:Texas Instruments 功能描述:IC, VIDEO AMPLIFIER, HEX, 350MHZ TSSOP20 |
| THS7368IPWR | 功能描述:視頻放大器 6-Ch 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 |
| THS7371IPW | 制造商:Texas Instruments 功能描述:VIDEO OPAM - Rail/Tube |
| THS7371IPWR | 制造商:Texas Instruments 功能描述:VIDEO OPAM - Tape and Reel |
| THS7372 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4-Channel Video Amplifier with One CVBS and Three Full-HD Filters with 6-dB Gain |
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